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|
// d_migrate.cpp
/**
* Copyright (C) 2008-2014 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
/**
these are commands that live in mongod
mostly around shard management and checking
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kSharding
#include "mongo/platform/basic.h"
#include <algorithm>
#include <boost/scoped_ptr.hpp>
#include <boost/thread/thread.hpp>
#include <map>
#include <string>
#include <vector>
#include "mongo/client/connpool.h"
#include "mongo/client/dbclientcursor.h"
#include "mongo/db/auth/action_set.h"
#include "mongo/db/auth/action_type.h"
#include "mongo/db/auth/authorization_manager.h"
#include "mongo/db/auth/authorization_manager_global.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/auth/privilege.h"
#include "mongo/db/catalog/index_create.h"
#include "mongo/db/clientcursor.h"
#include "mongo/db/commands.h"
#include "mongo/db/concurrency/lock_state.h"
#include "mongo/db/dbhelpers.h"
#include "mongo/db/exec/plan_stage.h"
#include "mongo/db/storage/mmap_v1/dur.h"
#include "mongo/db/field_parser.h"
#include "mongo/db/hasher.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/ops/delete.h"
#include "mongo/db/query/internal_plans.h"
#include "mongo/db/query/query_knobs.h"
#include "mongo/db/range_deleter_service.h"
#include "mongo/db/repl/oplog.h"
#include "mongo/db/repl/replication_coordinator_global.h"
#include "mongo/db/operation_context_impl.h"
#include "mongo/db/write_concern.h"
#include "mongo/logger/ramlog.h"
#include "mongo/s/chunk.h"
#include "mongo/s/chunk_version.h"
#include "mongo/s/config.h"
#include "mongo/s/d_state.h"
#include "mongo/s/distlock.h"
#include "mongo/s/shard.h"
#include "mongo/s/type_chunk.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/elapsed_tracker.h"
#include "mongo/util/exit.h"
#include "mongo/util/fail_point_service.h"
#include "mongo/util/log.h"
#include "mongo/util/processinfo.h"
#include "mongo/util/queue.h"
#include "mongo/util/startup_test.h"
// Pause while a fail point is enabled.
#define MONGO_FP_PAUSE_WHILE(symbol) while (MONGO_FAIL_POINT(symbol)) { sleepmillis(100); }
using namespace std;
namespace {
using boost::scoped_ptr;
using mongo::WriteConcernOptions;
using mongo::repl::ReplicationCoordinator;
const int kDefaultWTimeoutMs = 60 * 1000;
const WriteConcernOptions DefaultWriteConcern(2, WriteConcernOptions::NONE, kDefaultWTimeoutMs);
/**
* Returns the default write concern for migration cleanup (at donor shard) and
* cloning documents (at recipient shard).
*/
WriteConcernOptions getDefaultWriteConcern() {
ReplicationCoordinator* replCoordinator =
mongo::repl::getGlobalReplicationCoordinator();
if (replCoordinator->getReplicationMode() ==
mongo::repl::ReplicationCoordinator::modeReplSet) {
mongo::Status status =
replCoordinator->checkIfWriteConcernCanBeSatisfied(DefaultWriteConcern);
if (status.isOK()) {
return DefaultWriteConcern;
}
}
return WriteConcernOptions(1, WriteConcernOptions::NONE, 0);
}
}
namespace mongo {
MONGO_FP_DECLARE(failMigrationCommit);
MONGO_FP_DECLARE(failMigrationConfigWritePrepare);
MONGO_FP_DECLARE(failMigrationApplyOps);
Tee* migrateLog = RamLog::get("migrate");
class MoveTimingHelper {
public:
MoveTimingHelper(OperationContext* txn,
const string& where,
const string& ns,
BSONObj min,
BSONObj max ,
int total,
string* cmdErrmsg,
string toShard,
string fromShard)
: _txn(txn),
_where(where),
_ns(ns),
_to(toShard),
_from(fromShard),
_next(0),
_total(total),
_cmdErrmsg(cmdErrmsg) {
_b.append( "min" , min );
_b.append( "max" , max );
}
~MoveTimingHelper() {
// even if logChange doesn't throw, bson does
// sigh
try {
if ( !_to.empty() ){
_b.append( "to", _to );
}
if ( !_from.empty() ){
_b.append( "from", _from );
}
if ( _next != _total ) {
_b.append( "note" , "aborted" );
}
else {
_b.append( "note" , "success" );
}
if ( !_cmdErrmsg->empty() ) {
_b.append( "errmsg" , *_cmdErrmsg );
}
configServer.logChange( (string)"moveChunk." + _where , _ns, _b.obj() );
}
catch ( const std::exception& e ) {
warning() << "couldn't record timing for moveChunk '" << _where << "': " << e.what() << migrateLog;
}
}
void done(int step) {
verify( step == ++_next );
verify( step <= _total );
stringstream ss;
ss << "step " << step << " of " << _total;
string s = ss.str();
CurOp * op = _txn->getCurOp();
if ( op )
op->setMessage( s.c_str() );
else
warning() << "op is null in MoveTimingHelper::done" << migrateLog;
_b.appendNumber( s , _t.millis() );
_t.reset();
#if 0
// debugging for memory leak?
ProcessInfo pi;
ss << " v:" << pi.getVirtualMemorySize()
<< " r:" << pi.getResidentSize();
log() << ss.str() << migrateLog;
#endif
}
private:
OperationContext* const _txn;
Timer _t;
string _where;
string _ns;
string _to;
string _from;
int _next;
int _total; // expected # of steps
const string* _cmdErrmsg;
BSONObjBuilder _b;
};
class ChunkCommandHelper : public Command {
public:
ChunkCommandHelper( const char * name )
: Command( name ) {
}
virtual void help( stringstream& help ) const {
help << "internal - should not be called directly";
}
virtual bool slaveOk() const { return false; }
virtual bool adminOnly() const { return true; }
virtual bool isWriteCommandForConfigServer() const { return false; }
};
bool isInRange( const BSONObj& obj ,
const BSONObj& min ,
const BSONObj& max ,
const BSONObj& shardKeyPattern ) {
ShardKeyPattern shardKey( shardKeyPattern );
BSONObj k = shardKey.extractShardKeyFromDoc( obj );
return k.woCompare( min ) >= 0 && k.woCompare( max ) < 0;
}
class MigrateFromStatus {
public:
MigrateFromStatus():
_mutex("MigrateFromStatus"),
_inCriticalSection(false),
_memoryUsed(0),
_active(false),
_cloneLocsMutex("MigrateFromTrackerMutex") {
}
/**
* @return false if cannot start. One of the reason for not being able to
* start is there is already an existing migration in progress.
*/
bool start(OperationContext* txn,
const std::string& ns,
const BSONObj& min,
const BSONObj& max,
const BSONObj& shardKeyPattern) {
verify(!min.isEmpty());
verify(!max.isEmpty());
verify(!ns.empty());
// Get global shared to synchronize with logOp. Also see comments in the class
// members declaration for more details.
Lock::GlobalRead globalShared(txn->lockState());
scoped_lock lk(_mutex);
if (_active) {
return false;
}
_ns = ns;
_min = min;
_max = max;
_shardKeyPattern = shardKeyPattern;
verify(_deleted.size() == 0);
verify(_reload.size() == 0);
verify(_memoryUsed == 0);
_active = true;
scoped_lock tLock(_cloneLocsMutex);
verify(_cloneLocs.size() == 0);
return true;
}
void done(OperationContext* txn) {
log() << "MigrateFromStatus::done About to acquire global lock to exit critical "
"section" << endl;
// Get global shared to synchronize with logOp. Also see comments in the class
// members declaration for more details.
Lock::GlobalRead globalShared(txn->lockState());
scoped_lock lk(_mutex);
_active = false;
_deleteNotifyExec.reset( NULL );
_inCriticalSection = false;
_inCriticalSectionCV.notify_all();
_deleted.clear();
_reload.clear();
_memoryUsed = 0;
scoped_lock cloneLock(_cloneLocsMutex);
_cloneLocs.clear();
}
void logOp(OperationContext* txn,
const char* opstr,
const char* ns,
const BSONObj& obj,
BSONObj* patt,
bool notInActiveChunk) {
dassert(txn->lockState()->isWriteLocked()); // Must have Global IX.
if (!_active)
return;
if (_ns != ns)
return;
// no need to log if this is not an insertion, an update, or an actual deletion
// note: opstr 'db' isn't a deletion but a mention that a database exists (for replication
// machinery mostly)
char op = opstr[0];
if ( op == 'n' || op =='c' || ( op == 'd' && opstr[1] == 'b' ) )
return;
BSONElement ide;
if ( patt )
ide = patt->getField( "_id" );
else
ide = obj["_id"];
if ( ide.eoo() ) {
warning() << "logOpForSharding got mod with no _id, ignoring obj: " << obj << migrateLog;
return;
}
BSONObj it;
switch ( opstr[0] ) {
case 'd': {
if (notInActiveChunk) {
// we don't want to xfer things we're cleaning
// as then they'll be deleted on TO
// which is bad
return;
}
scoped_lock sl(_mutex);
// can't filter deletes :(
_deleted.push_back( ide.wrap() );
_memoryUsed += ide.size() + 5;
return;
}
case 'i':
it = obj;
break;
case 'u':
Client::Context ctx(txn, _ns);
if (!Helpers::findById(txn, ctx.db(), _ns.c_str(), ide.wrap(), it)) {
warning() << "logOpForSharding couldn't find: " << ide
<< " even though should have" << migrateLog;
return;
}
break;
}
if (!isInRange(it, _min, _max, _shardKeyPattern)) {
return;
}
scoped_lock sl(_mutex);
_reload.push_back(ide.wrap());
_memoryUsed += ide.size() + 5;
}
/**
* Insert items from docIdList to a new array with the given fieldName in the given
* builder. If explode is true, the inserted object will be the full version of the
* document. Note that the whenever an item from the docList is inserted to the array,
* it will also be removed from docList.
*
* Should be holding the collection lock for ns if explode is true.
*/
void xfer(OperationContext* txn,
const string& ns,
Database* db,
list<BSONObj> *docIdList,
BSONObjBuilder& builder,
const char* fieldName,
long long& size,
bool explode) {
const long long maxSize = 1024 * 1024;
if (docIdList->size() == 0 || size > maxSize)
return;
BSONArrayBuilder arr(builder.subarrayStart(fieldName));
list<BSONObj>::iterator docIdIter = docIdList->begin();
while (docIdIter != docIdList->end() && size < maxSize) {
BSONObj idDoc = *docIdIter;
if (explode) {
BSONObj fullDoc;
if (Helpers::findById(txn, db, ns.c_str(), idDoc, fullDoc)) {
arr.append( fullDoc );
size += fullDoc.objsize();
}
}
else {
arr.append(idDoc);
size += idDoc.objsize();
}
docIdIter = docIdList->erase(docIdIter);
}
arr.done();
}
/**
* called from the dest of a migrate
* transfers mods from src to dest
*/
bool transferMods(OperationContext* txn, string& errmsg, BSONObjBuilder& b) {
long long size = 0;
{
AutoGetCollectionForRead ctx(txn, getNS());
scoped_lock sl(_mutex);
if (!_active) {
errmsg = "no active migration!";
return false;
}
// TODO: fix SERVER-16540 race
xfer(txn, _ns, ctx.getDb(), &_deleted, b, "deleted", size, false);
xfer(txn, _ns, ctx.getDb(), &_reload, b, "reload", size, true);
}
b.append( "size" , size );
return true;
}
/**
* Get the disklocs that belong to the chunk migrated and sort them in _cloneLocs
* (to avoid seeking disk later).
*
* @param maxChunkSize number of bytes beyond which a chunk's base data (no indices)
* is considered too large to move.
* @param errmsg filled with textual description of error if this call return false.
* @return false if approximate chunk size is too big to move or true otherwise.
*/
bool storeCurrentLocs(OperationContext* txn,
long long maxChunkSize,
string& errmsg,
BSONObjBuilder& result ) {
AutoGetCollectionForRead ctx(txn, getNS());
Collection* collection = ctx.getCollection();
if ( !collection ) {
errmsg = "ns not found, should be impossible";
return false;
}
// Allow multiKey based on the invariant that shard keys must be single-valued.
// Therefore, any multi-key index prefixed by shard key cannot be multikey over
// the shard key fields.
IndexDescriptor *idx =
collection->getIndexCatalog()->findIndexByPrefix(txn,
_shardKeyPattern ,
false); /* allow multi key */
if (idx == NULL) {
errmsg = str::stream() << "can't find index with prefix " << _shardKeyPattern
<< " in storeCurrentLocs for " << _ns;
return false;
}
// Assume both min and max non-empty, append MinKey's to make them fit chosen index
BSONObj min;
BSONObj max;
KeyPattern kp(idx->keyPattern());
{
// It's alright not to lock _mutex all the way through based on the assumption
// that this is only called by the main thread that drives the migration and
// only it can start and stop the current migration.
scoped_lock sl(_mutex);
invariant( _deleteNotifyExec.get() == NULL );
WorkingSet* ws = new WorkingSet();
DeleteNotificationStage* dns = new DeleteNotificationStage();
PlanExecutor* deleteNotifyExec;
// Takes ownership of 'ws' and 'dns'.
Status execStatus = PlanExecutor::make(txn,
ws,
dns,
collection,
PlanExecutor::YIELD_MANUAL,
&deleteNotifyExec);
invariant(execStatus.isOK());
deleteNotifyExec->registerExec();
_deleteNotifyExec.reset(deleteNotifyExec);
min = Helpers::toKeyFormat(kp.extendRangeBound(_min, false));
max = Helpers::toKeyFormat(kp.extendRangeBound(_max, false));
}
auto_ptr<PlanExecutor> exec(
InternalPlanner::indexScan(txn, collection, idx, min, max, false));
// We can afford to yield here because any change to the base data that we might
// miss is already being queued and will migrate in the 'transferMods' stage.
exec->setYieldPolicy(PlanExecutor::YIELD_AUTO);
// use the average object size to estimate how many objects a full chunk would carry
// do that while traversing the chunk's range using the sharding index, below
// there's a fair amount of slack before we determine a chunk is too large because object sizes will vary
unsigned long long maxRecsWhenFull;
long long avgRecSize;
const long long totalRecs = collection->numRecords(txn);
if ( totalRecs > 0 ) {
avgRecSize = collection->dataSize(txn) / totalRecs;
maxRecsWhenFull = maxChunkSize / avgRecSize;
maxRecsWhenFull = std::min((unsigned long long)(Chunk::MaxObjectPerChunk + 1) , 130 * maxRecsWhenFull / 100 /* slack */ );
}
else {
avgRecSize = 0;
maxRecsWhenFull = Chunk::MaxObjectPerChunk + 1;
}
// do a full traversal of the chunk and don't stop even if we think it is a large chunk
// we want the number of records to better report, in that case
bool isLargeChunk = false;
unsigned long long recCount = 0;;
RecordId dl;
while (PlanExecutor::ADVANCED == exec->getNext(NULL, &dl)) {
if ( ! isLargeChunk ) {
scoped_lock lk(_cloneLocsMutex);
_cloneLocs.insert( dl );
}
if ( ++recCount > maxRecsWhenFull ) {
isLargeChunk = true;
// continue on despite knowing that it will fail,
// just to get the correct value for recCount.
}
}
exec.reset();
if ( isLargeChunk ) {
scoped_lock sl(_mutex);
warning() << "cannot move chunk: the maximum number of documents for a chunk is "
<< maxRecsWhenFull << " , the maximum chunk size is " << maxChunkSize
<< " , average document size is " << avgRecSize
<< ". Found " << recCount << " documents in chunk "
<< " ns: " << _ns << " "
<< _min << " -> " << _max << migrateLog;
result.appendBool( "chunkTooBig" , true );
result.appendNumber( "estimatedChunkSize" , (long long)(recCount * avgRecSize) );
errmsg = "chunk too big to move";
return false;
}
log() << "moveChunk number of documents: " << cloneLocsRemaining() << migrateLog;
txn->recoveryUnit()->commitAndRestart();
return true;
}
bool clone(OperationContext* txn, string& errmsg , BSONObjBuilder& result ) {
ElapsedTracker tracker(internalQueryExecYieldIterations,
internalQueryExecYieldPeriodMS);
int allocSize = 0;
{
AutoGetCollectionForRead ctx(txn, getNS());
scoped_lock sl(_mutex);
if (!_active) {
errmsg = "not active";
return false;
}
Collection* collection = ctx.getCollection();
if (!collection) {
errmsg = str::stream() << "collection " << _ns << " does not exist";
return false;
}
allocSize =
std::min(BSONObjMaxUserSize,
static_cast<int>((12 + collection->averageObjectSize(txn)) *
cloneLocsRemaining()));
}
bool isBufferFilled = false;
BSONArrayBuilder clonedDocsArrayBuilder(allocSize);
while (!isBufferFilled) {
AutoGetCollectionForRead ctx(txn, getNS());
scoped_lock sl(_mutex);
if (!_active) {
errmsg = "not active";
return false;
}
// TODO: fix SERVER-16540 race
Collection* collection = ctx.getCollection();
if (!collection) {
errmsg = str::stream() << "collection " << _ns << " does not exist";
return false;
}
scoped_lock lk(_cloneLocsMutex);
set<RecordId>::iterator cloneLocsIter = _cloneLocs.begin();
for ( ; cloneLocsIter != _cloneLocs.end(); ++cloneLocsIter) {
if (tracker.intervalHasElapsed()) // should I yield?
break;
RecordId dl = *cloneLocsIter;
Snapshotted<BSONObj> doc;
if (!collection->findDoc(txn, dl, &doc)) {
// doc was deleted
continue;
}
// Use the builder size instead of accumulating 'doc's size so that we take
// into consideration the overhead of BSONArray indices, and *always*
// append one doc.
if (clonedDocsArrayBuilder.arrSize() != 0 &&
(clonedDocsArrayBuilder.len() + doc.value().objsize() + 1024)
> BSONObjMaxUserSize) {
isBufferFilled = true; // break out of outer while loop
break;
}
clonedDocsArrayBuilder.append(doc.value());
}
_cloneLocs.erase(_cloneLocs.begin(), cloneLocsIter);
// Note: must be holding _cloneLocsMutex, don't move this inside while condition!
if (_cloneLocs.empty()) {
break;
}
}
result.appendArray("objects", clonedDocsArrayBuilder.arr());
return true;
}
void aboutToDelete( const RecordId& dl ) {
// Even though above we call findDoc to check for existance
// that check only works for non-mmapv1 engines, and this is needed
// for mmapv1.
scoped_lock lk(_cloneLocsMutex);
_cloneLocs.erase( dl );
}
std::size_t cloneLocsRemaining() {
scoped_lock lk(_cloneLocsMutex);
return _cloneLocs.size();
}
long long mbUsed() const {
scoped_lock lk(_mutex);
return _memoryUsed / ( 1024 * 1024 );
}
bool getInCriticalSection() const {
scoped_lock lk(_mutex);
return _inCriticalSection;
}
void setInCriticalSection( bool b ) {
scoped_lock lk(_mutex);
_inCriticalSection = b;
_inCriticalSectionCV.notify_all();
}
std::string getNS() const {
scoped_lock sl(_mutex);
return _ns;
}
/**
* @return true if we are NOT in the critical section
*/
bool waitTillNotInCriticalSection( int maxSecondsToWait ) {
boost::xtime xt;
boost::xtime_get(&xt, MONGO_BOOST_TIME_UTC);
xt.sec += maxSecondsToWait;
scoped_lock lk(_mutex);
while (_inCriticalSection) {
if (!_inCriticalSectionCV.timed_wait(lk.boost(), xt))
return false;
}
return true;
}
bool isActive() const { return _getActive(); }
private:
bool _getActive() const { scoped_lock lk(_mutex); return _active; }
void _setActive( bool b ) { scoped_lock lk(_mutex); _active = b; }
/**
* Used to receive invalidation notifications.
*
* XXX: move to the exec/ directory.
*/
class DeleteNotificationStage : public PlanStage {
public:
virtual void invalidate(OperationContext* txn,
const RecordId& dl,
InvalidationType type);
virtual StageState work(WorkingSetID* out) {
invariant( false );
}
virtual bool isEOF() {
invariant( false );
return false;
}
virtual void kill() {
}
virtual void saveState() {
invariant( false );
}
virtual void restoreState(OperationContext* opCtx) {
invariant( false );
}
virtual PlanStageStats* getStats() {
invariant( false );
return NULL;
}
virtual CommonStats* getCommonStats() {
invariant( false );
return NULL;
}
virtual SpecificStats* getSpecificStats() {
invariant( false );
return NULL;
}
virtual std::vector<PlanStage*> getChildren() const {
vector<PlanStage*> empty;
return empty;
}
virtual StageType stageType() const {
return STAGE_NOTIFY_DELETE;
}
};
//
// All member variables are labeled with one of the following codes indicating the
// synchronization rules for accessing them.
//
// (M) Must hold _mutex for access.
// (MG) For reads, _mutex *OR* Global IX Lock must be held.
// For writes, the _mutex *AND* (Global Shared or Exclusive Lock) must be held.
// (C) Must hold _cloneLocsMutex for access.
//
// Locking order:
//
// Global Lock -> _mutex -> _cloneLocsMutex
mutable mongo::mutex _mutex;
boost::condition _inCriticalSectionCV; // (M)
// Is migration currently in critical section. This can be used to block new writes.
bool _inCriticalSection; // (M)
scoped_ptr<PlanExecutor> _deleteNotifyExec; // (M)
// List of _id of documents that were modified that must be re-cloned.
list<BSONObj> _reload; // (M)
// List of _id of documents that were deleted during clone that should be deleted later.
list<BSONObj> _deleted; // (M)
// bytes in _reload + _deleted
long long _memoryUsed; // (M)
// If a migration is currently active.
bool _active; // (MG)
string _ns; // (MG)
BSONObj _min; // (MG)
BSONObj _max; // (MG)
BSONObj _shardKeyPattern; // (MG)
mutable mongo::mutex _cloneLocsMutex;
// List of record id that needs to be transferred from here to the other side.
set<RecordId> _cloneLocs; // (C)
} migrateFromStatus;
void MigrateFromStatus::DeleteNotificationStage::invalidate(OperationContext *txn,
const RecordId& dl,
InvalidationType type) {
if ( type == INVALIDATION_DELETION ) {
migrateFromStatus.aboutToDelete( dl );
}
}
struct MigrateStatusHolder {
MigrateStatusHolder( OperationContext* txn,
const std::string& ns ,
const BSONObj& min ,
const BSONObj& max ,
const BSONObj& shardKeyPattern )
: _txn(txn) {
_isAnotherMigrationActive =
!migrateFromStatus.start(txn, ns, min, max, shardKeyPattern);
}
~MigrateStatusHolder() {
if (!_isAnotherMigrationActive) {
migrateFromStatus.done(_txn);
}
}
bool isAnotherMigrationActive() const {
return _isAnotherMigrationActive;
}
private:
OperationContext* _txn;
bool _isAnotherMigrationActive;
};
void logOpForSharding(OperationContext* txn,
const char * opstr,
const char * ns,
const BSONObj& obj,
BSONObj * patt,
bool notInActiveChunk) {
migrateFromStatus.logOp(txn, opstr, ns, obj, patt, notInActiveChunk);
}
class TransferModsCommand : public ChunkCommandHelper {
public:
void help(stringstream& h) const { h << "internal"; }
TransferModsCommand() : ChunkCommandHelper( "_transferMods" ) {}
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {
ActionSet actions;
actions.addAction(ActionType::internal);
out->push_back(Privilege(ResourcePattern::forClusterResource(), actions));
}
bool run(OperationContext* txn, const string& , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
return migrateFromStatus.transferMods(txn, errmsg, result);
}
} transferModsCommand;
class InitialCloneCommand : public ChunkCommandHelper {
public:
void help(stringstream& h) const { h << "internal"; }
InitialCloneCommand() : ChunkCommandHelper( "_migrateClone" ) {}
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {
ActionSet actions;
actions.addAction(ActionType::internal);
out->push_back(Privilege(ResourcePattern::forClusterResource(), actions));
}
bool run(OperationContext* txn, const string& , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
return migrateFromStatus.clone(txn, errmsg, result);
}
} initialCloneCommand;
// Tests can pause / resume moveChunk's progress at each step by enabling / disabling each fail point.
MONGO_FP_DECLARE(moveChunkHangAtStep1);
MONGO_FP_DECLARE(moveChunkHangAtStep2);
MONGO_FP_DECLARE(moveChunkHangAtStep3);
MONGO_FP_DECLARE(moveChunkHangAtStep4);
MONGO_FP_DECLARE(moveChunkHangAtStep5);
MONGO_FP_DECLARE(moveChunkHangAtStep6);
/**
* this is the main entry for moveChunk
* called to initial a move
* usually by a mongos
* this is called on the "from" side
*
* Format:
* {
* moveChunk: "namespace",
* from: "hostAndPort",
* fromShard: "shardName",
* to: "hostAndPort",
* toShard: "shardName",
* min: {},
* max: {},
* maxChunkBytes: numeric,
* shardId: "_id of chunk document in config.chunks",
* configdb: "hostAndPort",
*
* // optional
* secondaryThrottle: bool, //defaults to true.
* writeConcern: {} // applies to individual writes.
* }
*/
class MoveChunkCommand : public Command {
public:
MoveChunkCommand() : Command( "moveChunk" ) {}
virtual void help( stringstream& help ) const {
help << "should not be calling this directly";
}
virtual bool slaveOk() const { return false; }
virtual bool adminOnly() const { return true; }
virtual bool isWriteCommandForConfigServer() const { return false; }
virtual Status checkAuthForCommand(ClientBasic* client,
const std::string& dbname,
const BSONObj& cmdObj) {
if (!client->getAuthorizationSession()->isAuthorizedForActionsOnResource(
ResourcePattern::forExactNamespace(NamespaceString(parseNs(dbname, cmdObj))),
ActionType::moveChunk)) {
return Status(ErrorCodes::Unauthorized, "Unauthorized");
}
return Status::OK();
}
virtual std::string parseNs(const std::string& dbname, const BSONObj& cmdObj) const {
return parseNsFullyQualified(dbname, cmdObj);
}
bool run(OperationContext* txn, const string& dbname, BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
// 1. Parse options
// 2. Make sure my view is complete and lock the distributed lock to ensure shard
// metadata stability.
// 3. Migration
// Retrieve all RecordIds, which need to be migrated in order to do as little seeking
// as possible during transfer. Retrieval of the RecordIds happens under a collection
// lock, but then the collection lock is dropped. This opens up an opportunity for
// repair or compact to invalidate these RecordIds, because these commands do not
// synchronized with migration. Note that data modifications are not a problem,
// because we are registered for change notifications.
//
// 4. pause till migrate caught up
// 5. LOCK
// a) update my config, essentially locking
// b) finish migrate
// c) update config server
// d) logChange to config server
// 6. wait for all current cursors to expire
// 7. remove data locally
// -------------------------------
// 1.
string ns = parseNs(dbname, cmdObj);
// The shard addresses, redundant, but allows for validation
string toShardHost = cmdObj["to"].str();
string fromShardHost = cmdObj["from"].str();
// The shard names
string toShardName = cmdObj["toShard"].str();
string fromShardName = cmdObj["fromShard"].str();
// Process secondary throttle settings and assign defaults if necessary.
BSONObj secThrottleObj;
WriteConcernOptions writeConcern;
Status status = writeConcern.parseSecondaryThrottle(cmdObj, &secThrottleObj);
if (!status.isOK()){
if (status.code() != ErrorCodes::WriteConcernNotDefined) {
warning() << status.toString() << endl;
return appendCommandStatus(result, status);
}
writeConcern = getDefaultWriteConcern();
}
else {
repl::ReplicationCoordinator* replCoordinator =
repl::getGlobalReplicationCoordinator();
if (replCoordinator->getReplicationMode() ==
repl::ReplicationCoordinator::modeMasterSlave &&
writeConcern.shouldWaitForOtherNodes()) {
warning() << "moveChunk cannot check if secondary throttle setting "
<< writeConcern.toBSON()
<< " can be enforced in a master slave configuration";
}
Status status = replCoordinator->checkIfWriteConcernCanBeSatisfied(writeConcern);
if (!status.isOK() && status != ErrorCodes::NoReplicationEnabled) {
warning() << status.toString() << endl;
return appendCommandStatus(result, status);
}
}
if (writeConcern.shouldWaitForOtherNodes() &&
writeConcern.wTimeout == WriteConcernOptions::kNoTimeout) {
// Don't allow no timeout.
writeConcern.wTimeout = kDefaultWTimeoutMs;
}
// Do inline deletion
bool waitForDelete = cmdObj["waitForDelete"].trueValue();
if (waitForDelete) {
log() << "moveChunk waiting for full cleanup after move" << endl;
}
BSONObj min = cmdObj["min"].Obj();
BSONObj max = cmdObj["max"].Obj();
BSONElement shardId = cmdObj["shardId"];
BSONElement maxSizeElem = cmdObj["maxChunkSizeBytes"];
if ( ns.empty() ) {
errmsg = "need to specify namespace in command";
return false;
}
if ( toShardName.empty() ) {
errmsg = "need to specify shard to move chunk to";
return false;
}
if ( fromShardName.empty() ) {
errmsg = "need to specify shard to move chunk from";
return false;
}
if ( min.isEmpty() ) {
errmsg = "need to specify a min";
return false;
}
if ( max.isEmpty() ) {
errmsg = "need to specify a max";
return false;
}
if ( shardId.eoo() ) {
errmsg = "need shardId";
return false;
}
if ( maxSizeElem.eoo() || ! maxSizeElem.isNumber() ) {
errmsg = "need to specify maxChunkSizeBytes";
return false;
}
const long long maxChunkSize = maxSizeElem.numberLong(); // in bytes
// This could be the first call that enables sharding - make sure we initialize the
// sharding state for this shard.
if ( ! shardingState.enabled() ) {
if ( cmdObj["configdb"].type() != String ) {
errmsg = "sharding not enabled";
warning() << errmsg << endl;
return false;
}
string configdb = cmdObj["configdb"].String();
ShardingState::initialize(configdb);
}
// Initialize our current shard name in the shard state if needed
shardingState.gotShardName(fromShardName);
// Make sure we're as up-to-date as possible with shard information
// This catches the case where we had to previously changed a shard's host by
// removing/adding a shard with the same name
Shard::reloadShardInfo();
Shard toShard(toShardName);
Shard fromShard(fromShardName);
ConnectionString configLoc = ConnectionString::parse(shardingState.getConfigServer(),
errmsg);
if (!configLoc.isValid()) {
warning() << errmsg;
return false;
}
MoveTimingHelper timing(txn, "from" , ns , min , max , 6 /* steps */ , &errmsg,
toShardName, fromShardName );
log() << "received moveChunk request: " << cmdObj << migrateLog;
timing.done(1);
MONGO_FP_PAUSE_WHILE(moveChunkHangAtStep1);
// 2.
if ( migrateFromStatus.isActive() ) {
errmsg = "migration already in progress";
warning() << errmsg << endl;
return false;
}
//
// Get the distributed lock
//
ScopedDistributedLock collLock(configLoc, ns);
collLock.setLockMessage(str::stream() << "migrating chunk [" << minKey << ", " << maxKey
<< ") in " << ns);
Status acquisitionStatus = collLock.tryAcquire();
if (!acquisitionStatus.isOK()) {
errmsg = stream() << "could not acquire collection lock for " << ns
<< " to migrate chunk [" << minKey << "," << maxKey << ")"
<< causedBy(acquisitionStatus);
warning() << errmsg << endl;
return false;
}
BSONObj chunkInfo =
BSON("min" << min << "max" << max <<
"from" << fromShard.getName() << "to" << toShard.getName());
configServer.logChange("moveChunk.start", ns, chunkInfo);
// Always refresh our metadata remotely
ChunkVersion origShardVersion;
Status refreshStatus = shardingState.refreshMetadataNow(txn, ns, &origShardVersion);
if (!refreshStatus.isOK()) {
errmsg = str::stream() << "moveChunk cannot start migrate of chunk "
<< "[" << minKey << "," << maxKey << ")"
<< causedBy(refreshStatus.reason());
warning() << errmsg;
return false;
}
if (origShardVersion.majorVersion() == 0) {
// It makes no sense to migrate if our version is zero and we have no chunks
errmsg = str::stream() << "moveChunk cannot start migrate of chunk "
<< "[" << minKey << "," << maxKey << ")"
<< " with zero shard version";
warning() << errmsg;
return false;
}
// From mongos >= v3.0.
BSONElement epochElem(cmdObj["epoch"]);
if (epochElem.type() == jstOID) {
OID cmdEpoch = epochElem.OID();
if (cmdEpoch != origShardVersion.epoch()) {
errmsg = str::stream() << "moveChunk cannot move chunk "
<< "[" << minKey << ","
<< maxKey << "), "
<< "collection may have been dropped. "
<< "current epoch: " << origShardVersion.epoch()
<< ", cmd epoch: " << cmdEpoch;
warning() << errmsg;
return false;
}
}
// Get collection metadata
const CollectionMetadataPtr origCollMetadata(shardingState.getCollectionMetadata(ns));
// With nonzero shard version, we must have metadata
invariant(NULL != origCollMetadata);
ChunkVersion origCollVersion = origCollMetadata->getCollVersion();
BSONObj shardKeyPattern = origCollMetadata->getKeyPattern();
// With nonzero shard version, we must have a coll version >= our shard version
invariant(origCollVersion >= origShardVersion);
// With nonzero shard version, we must have a shard key
invariant(!shardKeyPattern.isEmpty());
ChunkType origChunk;
if (!origCollMetadata->getNextChunk(min, &origChunk)
|| origChunk.getMin().woCompare(min) || origChunk.getMax().woCompare(max)) {
// Our boundaries are different from those passed in
errmsg = str::stream() << "moveChunk cannot find chunk "
<< "[" << minKey << "," << maxKey << ")"
<< " to migrate, the chunk boundaries may be stale";
warning() << errmsg;
return false;
}
log() << "moveChunk request accepted at version " << origShardVersion;
timing.done(2);
MONGO_FP_PAUSE_WHILE(moveChunkHangAtStep2);
// 3.
MigrateStatusHolder statusHolder(txn, ns, min, max, shardKeyPattern);
if (statusHolder.isAnotherMigrationActive()) {
errmsg = "moveChunk is already in progress from this shard";
warning() << errmsg << endl;
return false;
}
{
// See comment at the top of the function for more information on what
// synchronization is used here.
if (!migrateFromStatus.storeCurrentLocs(txn, maxChunkSize, errmsg, result)) {
warning() << errmsg << endl;
return false;
}
ScopedDbConnection connTo(toShard.getConnString());
BSONObj res;
bool ok;
const bool isSecondaryThrottle(writeConcern.shouldWaitForOtherNodes());
BSONObjBuilder recvChunkStartBuilder;
recvChunkStartBuilder.append("_recvChunkStart", ns);
recvChunkStartBuilder.append("from", fromShard.getConnString());
recvChunkStartBuilder.append("fromShardName", fromShard.getName());
recvChunkStartBuilder.append("toShardName", toShard.getName());
recvChunkStartBuilder.append("min", min);
recvChunkStartBuilder.append("max", max);
recvChunkStartBuilder.append("shardKeyPattern", shardKeyPattern);
recvChunkStartBuilder.append("configServer", configServer.modelServer());
recvChunkStartBuilder.append("secondaryThrottle", isSecondaryThrottle);
// Follow the same convention in moveChunk.
if (isSecondaryThrottle && !secThrottleObj.isEmpty()) {
recvChunkStartBuilder.append("writeConcern", secThrottleObj);
}
try{
ok = connTo->runCommand("admin", recvChunkStartBuilder.done(), res);
}
catch( DBException& e ){
errmsg = str::stream() << "moveChunk could not contact to: shard "
<< toShardName << " to start transfer" << causedBy( e );
warning() << errmsg << endl;
return false;
}
connTo.done();
if ( ! ok ) {
errmsg = "moveChunk failed to engage TO-shard in the data transfer: ";
verify( res["errmsg"].type() );
errmsg += res["errmsg"].String();
result.append( "cause" , res );
warning() << errmsg << endl;
return false;
}
}
timing.done( 3 );
MONGO_FP_PAUSE_WHILE(moveChunkHangAtStep3);
// 4.
// Track last result from TO shard for sanity check
BSONObj res;
for ( int i=0; i<86400; i++ ) { // don't want a single chunk move to take more than a day
invariant(!txn->lockState()->isLocked());
// Exponential sleep backoff, up to 1024ms. Don't sleep much on the first few
// iterations, since we want empty chunk migrations to be fast.
sleepmillis( 1 << std::min( i , 10 ) );
ScopedDbConnection conn(toShard.getConnString());
bool ok;
res = BSONObj();
try {
ok = conn->runCommand( "admin" , BSON( "_recvChunkStatus" << 1 ) , res );
res = res.getOwned();
}
catch( DBException& e ){
errmsg = str::stream() << "moveChunk could not contact to: shard " << toShardName << " to monitor transfer" << causedBy( e );
warning() << errmsg << endl;
return false;
}
conn.done();
if ( res["ns"].str() != ns ||
res["from"].str() != fromShard.getConnString() ||
!res["min"].isABSONObj() ||
res["min"].Obj().woCompare(min) != 0 ||
!res["max"].isABSONObj() ||
res["max"].Obj().woCompare(max) != 0 ) {
// This can happen when the destination aborted the migration and
// received another recvChunk before this thread sees the transition
// to the abort state. This is currently possible only if multiple migrations
// are happening at once. This is an unfortunate consequence of the shards not
// being able to keep track of multiple incoming and outgoing migrations.
errmsg = str::stream() << "Destination shard aborted migration, "
"now running a new one: " << res;
warning() << errmsg << endl;
return false;
}
LOG(0) << "moveChunk data transfer progress: " << res << " my mem used: " << migrateFromStatus.mbUsed() << migrateLog;
if ( ! ok || res["state"].String() == "fail" ) {
warning() << "moveChunk error transferring data caused migration abort: " << res << migrateLog;
errmsg = "data transfer error";
result.append( "cause" , res );
return false;
}
if ( res["state"].String() == "steady" )
break;
if ( migrateFromStatus.mbUsed() > (500 * 1024 * 1024) ) {
// this is too much memory for us to use for this
// so we're going to abort the migrate
ScopedDbConnection conn(toShard.getConnString());
BSONObj res;
if (!conn->runCommand( "admin", BSON( "_recvChunkAbort" << 1 ), res )) {
warning() << "Error encountered while trying to abort migration on "
<< "destination shard" << toShard.getConnString() << endl;
}
res = res.getOwned();
conn.done();
error() << "aborting migrate because too much memory used res: " << res << migrateLog;
errmsg = "aborting migrate because too much memory used";
result.appendBool( "split" , true );
return false;
}
txn->checkForInterrupt();
}
timing.done(4);
MONGO_FP_PAUSE_WHILE(moveChunkHangAtStep4);
// 5.
// Before we get into the critical section of the migration, let's double check
// that the docs have been cloned, the config servers are reachable,
// and the lock is in place.
log() << "About to check if it is safe to enter critical section" << endl;
// Ensure all cloned docs have actually been transferred
std::size_t locsRemaining = migrateFromStatus.cloneLocsRemaining();
if ( locsRemaining != 0 ) {
errmsg =
str::stream() << "moveChunk cannot enter critical section before all data is"
<< " cloned, " << locsRemaining << " locs were not transferred"
<< " but to-shard reported " << res;
// Should never happen, but safe to abort before critical section
error() << errmsg << migrateLog;
dassert( false );
return false;
}
// Ensure distributed lock still held
Status lockStatus = collLock.checkStatus();
if (!lockStatus.isOK()) {
errmsg = str::stream() << "not entering migrate critical section because "
<< lockStatus.toString();
warning() << errmsg << endl;
return false;
}
log() << "About to enter migrate critical section" << endl;
{
// 5.a
// we're under the collection lock here, so no other migrate can change maxVersion
// or CollectionMetadata state
migrateFromStatus.setInCriticalSection( true );
ChunkVersion myVersion = origCollVersion;
myVersion.incMajor();
{
ScopedTransaction transaction(txn, MODE_IX);
Lock::DBLock lk(txn->lockState(), nsToDatabaseSubstring(ns), MODE_IX);
Lock::CollectionLock collLock(txn->lockState(), ns, MODE_X);
verify( myVersion > shardingState.getVersion( ns ) );
// bump the metadata's version up and "forget" about the chunk being moved
// this is not the commit point but in practice the state in this shard won't
// until the commit it done
shardingState.donateChunk(txn, ns, min, max, myVersion);
}
log() << "moveChunk setting version to: " << myVersion << migrateLog;
// 5.b
// we're under the collection lock here, too, so we can undo the chunk donation because no other state change
// could be ongoing
BSONObj res;
bool ok;
try {
ScopedDbConnection connTo( toShard.getConnString(), 35.0 );
ok = connTo->runCommand( "admin", BSON( "_recvChunkCommit" << 1 ), res );
connTo.done();
}
catch ( DBException& e ) {
errmsg = str::stream() << "moveChunk could not contact to: shard "
<< toShard.getConnString() << " to commit transfer"
<< causedBy( e );
warning() << errmsg << endl;
ok = false;
}
if ( !ok || MONGO_FAIL_POINT(failMigrationCommit) ) {
log() << "moveChunk migrate commit not accepted by TO-shard: " << res
<< " resetting shard version to: " << origShardVersion << migrateLog;
{
ScopedTransaction transaction(txn, MODE_IX);
Lock::DBLock dbLock(txn->lockState(), nsToDatabaseSubstring(ns), MODE_IX);
Lock::CollectionLock collLock(txn->lockState(), ns, MODE_X);
log() << "moveChunk collection lock acquired to reset shard version from "
"failed migration"
<< endl;
// revert the chunk manager back to the state before "forgetting" about the
// chunk
shardingState.undoDonateChunk(txn, ns, origCollMetadata);
}
log() << "Shard version successfully reset to clean up failed migration"
<< endl;
errmsg = "_recvChunkCommit failed!";
result.append( "cause", res );
return false;
}
log() << "moveChunk migrate commit accepted by TO-shard: " << res << migrateLog;
// 5.c
// version at which the next highest lastmod will be set
// if the chunk being moved is the last in the shard, nextVersion is that chunk's lastmod
// otherwise the highest version is from the chunk being bumped on the FROM-shard
ChunkVersion nextVersion;
// we want to go only once to the configDB but perhaps change two chunks, the one being migrated and another
// local one (so to bump version for the entire shard)
// we use the 'applyOps' mechanism to group the two updates and make them safer
// TODO pull config update code to a module
BSONObjBuilder cmdBuilder;
BSONArrayBuilder updates( cmdBuilder.subarrayStart( "applyOps" ) );
{
// update for the chunk being moved
BSONObjBuilder op;
op.append( "op" , "u" );
op.appendBool( "b" , false /* no upserting */ );
op.append( "ns" , ChunkType::ConfigNS );
BSONObjBuilder n( op.subobjStart( "o" ) );
n.append(ChunkType::name(), Chunk::genID(ns, min));
myVersion.addToBSON(n, ChunkType::DEPRECATED_lastmod());
n.append(ChunkType::ns(), ns);
n.append(ChunkType::min(), min);
n.append(ChunkType::max(), max);
n.append(ChunkType::shard(), toShard.getName());
n.done();
BSONObjBuilder q( op.subobjStart( "o2" ) );
q.append(ChunkType::name(), Chunk::genID(ns, min));
q.done();
updates.append( op.obj() );
}
nextVersion = myVersion;
// if we have chunks left on the FROM shard, update the version of one of them as
// well. we can figure that out by grabbing the metadata installed on 5.a
const CollectionMetadataPtr bumpedCollMetadata( shardingState.getCollectionMetadata( ns ) );
if( bumpedCollMetadata->getNumChunks() > 0 ) {
// get another chunk on that shard
ChunkType bumpChunk;
bool result =
bumpedCollMetadata->getNextChunk( bumpedCollMetadata->getMinKey(),
&bumpChunk );
BSONObj bumpMin = bumpChunk.getMin();
BSONObj bumpMax = bumpChunk.getMax();
(void)result; // for compile warning on non-debug
dassert( result );
dassert( bumpMin.woCompare( min ) != 0 );
BSONObjBuilder op;
op.append( "op" , "u" );
op.appendBool( "b" , false );
op.append( "ns" , ChunkType::ConfigNS );
nextVersion.incMinor(); // same as used on donateChunk
BSONObjBuilder n( op.subobjStart( "o" ) );
n.append(ChunkType::name(), Chunk::genID(ns, bumpMin));
nextVersion.addToBSON(n, ChunkType::DEPRECATED_lastmod());
n.append(ChunkType::ns(), ns);
n.append(ChunkType::min(), bumpMin);
n.append(ChunkType::max(), bumpMax);
n.append(ChunkType::shard(), fromShard.getName());
n.done();
BSONObjBuilder q( op.subobjStart( "o2" ) );
q.append(ChunkType::name(), Chunk::genID(ns, bumpMin));
q.done();
updates.append( op.obj() );
log() << "moveChunk updating self version to: " << nextVersion << " through "
<< bumpMin << " -> " << bumpMax << " for collection '" << ns << "'" << migrateLog;
}
else {
log() << "moveChunk moved last chunk out for collection '" << ns << "'" << migrateLog;
}
updates.done();
BSONArrayBuilder preCond( cmdBuilder.subarrayStart( "preCondition" ) );
{
BSONObjBuilder b;
b.append("ns", ChunkType::ConfigNS);
b.append("q", BSON("query" << BSON(ChunkType::ns(ns)) <<
"orderby" << BSON(ChunkType::DEPRECATED_lastmod() << -1)));
{
BSONObjBuilder bb( b.subobjStart( "res" ) );
// TODO: For backwards compatibility, we can't yet require an epoch here
bb.appendTimestamp(ChunkType::DEPRECATED_lastmod(), origCollVersion.toLong());
bb.done();
}
preCond.append( b.obj() );
}
preCond.done();
BSONObj cmd = cmdBuilder.obj();
LOG(7) << "moveChunk update: " << cmd << migrateLog;
int exceptionCode = OkCode;
ok = false;
BSONObj cmdResult;
try {
// For testing migration failures
if ( MONGO_FAIL_POINT(failMigrationConfigWritePrepare) ) {
throw DBException( "mock migration failure before config write",
PrepareConfigsFailedCode );
}
ScopedDbConnection conn(shardingState.getConfigServer(), 10.0);
ok = conn->runCommand( "config" , cmd , cmdResult );
if (MONGO_FAIL_POINT(failMigrationApplyOps)) {
throw SocketException(SocketException::RECV_ERROR,
shardingState.getConfigServer());
}
conn.done();
}
catch ( DBException& e ) {
warning() << e << migrateLog;
ok = false;
exceptionCode = e.getCode();
BSONObjBuilder b;
e.getInfo().append( b );
cmdResult = b.obj();
errmsg = cmdResult.toString();
}
if ( exceptionCode == PrepareConfigsFailedCode ) {
// In the process of issuing the migrate commit, the SyncClusterConnection
// checks that the config servers are reachable. If they are not, we are
// sure that the applyOps command was not sent to any of the configs, so we
// can safely back out of the migration here, by resetting the shard
// version that we bumped up to in the donateChunk() call above.
log() << "About to acquire moveChunk coll lock to reset shard version from "
<< "failed migration" << endl;
{
ScopedTransaction transaction(txn, MODE_IX);
Lock::DBLock dbLock(txn->lockState(), nsToDatabaseSubstring(ns), MODE_IX);
Lock::CollectionLock collLock(txn->lockState(), ns, MODE_X);
// Revert the metadata back to the state before "forgetting"
// about the chunk.
shardingState.undoDonateChunk(txn, ns, origCollMetadata);
}
log() << "Shard version successfully reset to clean up failed migration" << endl;
errmsg = "Failed to send migrate commit to configs because " + errmsg;
return false;
}
else if ( ! ok || exceptionCode != OkCode ) {
// this could be a blip in the connectivity
// wait out a few seconds and check if the commit request made it
//
// if the commit made it to the config, we'll see the chunk in the new shard and there's no action
// if the commit did not make it, currently the only way to fix this state is to bounce the mongod so
// that the old state (before migrating) be brought in
warning() << "moveChunk commit outcome ongoing: " << cmd << " for command :" << cmdResult << migrateLog;
sleepsecs( 10 );
try {
ScopedDbConnection conn(shardingState.getConfigServer(), 10.0);
// look for the chunk in this shard whose version got bumped
// we assume that if that mod made it to the config, the applyOps was successful
BSONObj doc = conn->findOne(ChunkType::ConfigNS,
Query(BSON(ChunkType::ns(ns)))
.sort(BSON(ChunkType::DEPRECATED_lastmod() << -1)));
ChunkVersion checkVersion(ChunkVersion::fromBSON(doc));
if ( checkVersion.equals( nextVersion ) ) {
log() << "moveChunk commit confirmed" << migrateLog;
errmsg.clear();
}
else {
error() << "moveChunk commit failed: version is at "
<< checkVersion << " instead of " << nextVersion << migrateLog;
error() << "TERMINATING" << migrateLog;
dbexit( EXIT_SHARDING_ERROR );
}
conn.done();
}
catch ( ... ) {
error() << "moveChunk failed to get confirmation of commit" << migrateLog;
error() << "TERMINATING" << migrateLog;
dbexit( EXIT_SHARDING_ERROR );
}
}
migrateFromStatus.setInCriticalSection( false );
// 5.d
BSONObjBuilder commitInfo;
commitInfo.appendElements( chunkInfo );
if ( res["counts"].type() == Object )
commitInfo.appendElements( res["counts"].Obj() );
configServer.logChange( "moveChunk.commit" , ns , commitInfo.obj() );
}
migrateFromStatus.done(txn);
timing.done(5);
MONGO_FP_PAUSE_WHILE(moveChunkHangAtStep5);
// 6.
// NOTE: It is important that the distributed collection lock be held for this step.
RangeDeleter* deleter = getDeleter();
RangeDeleterOptions deleterOptions(KeyRange(ns,
min.getOwned(),
max.getOwned(),
shardKeyPattern));
deleterOptions.writeConcern = writeConcern;
deleterOptions.waitForOpenCursors = true;
deleterOptions.fromMigrate = true;
deleterOptions.onlyRemoveOrphanedDocs = true;
deleterOptions.removeSaverReason = "post-cleanup";
if (waitForDelete) {
log() << "doing delete inline for cleanup of chunk data" << migrateLog;
string errMsg;
// This is an immediate delete, and as a consequence, there could be more
// deletes happening simultaneously than there are deleter worker threads.
if (!deleter->deleteNow(txn,
deleterOptions,
&errMsg)) {
log() << "Error occured while performing cleanup: " << errMsg << endl;
}
}
else {
log() << "forking for cleanup of chunk data" << migrateLog;
string errMsg;
if (!deleter->queueDelete(txn,
deleterOptions,
NULL, // Don't want to be notified.
&errMsg)) {
log() << "could not queue migration cleanup: " << errMsg << endl;
}
}
timing.done(6);
MONGO_FP_PAUSE_WHILE(moveChunkHangAtStep6);
return true;
}
} moveChunkCmd;
bool ShardingState::inCriticalMigrateSection() {
return migrateFromStatus.getInCriticalSection();
}
bool ShardingState::waitTillNotInCriticalSection( int maxSecondsToWait ) {
return migrateFromStatus.waitTillNotInCriticalSection( maxSecondsToWait );
}
/* -----
below this are the "to" side commands
command to initiate
worker thread
does initial clone
pulls initial change set
keeps pulling
keeps state
command to get state
commend to "commit"
*/
// Enabling / disabling these fail points pauses / resumes MigrateStatus::_go(), the thread
// that receives a chunk migration from the donor.
MONGO_FP_DECLARE(migrateThreadHangAtStep1);
MONGO_FP_DECLARE(migrateThreadHangAtStep2);
MONGO_FP_DECLARE(migrateThreadHangAtStep3);
MONGO_FP_DECLARE(migrateThreadHangAtStep4);
MONGO_FP_DECLARE(migrateThreadHangAtStep5);
class MigrateStatus {
public:
enum State {
READY,
CLONE,
CATCHUP,
STEADY,
COMMIT_START,
DONE,
FAIL,
ABORT
};
MigrateStatus():
_mutex("MigrateStatus"),
_active(false),
_numCloned(0),
_clonedBytes(0),
_numCatchup(0),
_numSteady(0),
_state(READY) {
}
void setState(State newState) {
scoped_lock sl(_mutex);
_state = newState;
}
State getState() const {
scoped_lock sl(_mutex);
return _state;
}
/**
* Returns OK if preparation was successful.
*/
Status prepare(const std::string& ns,
const std::string& fromShard,
const BSONObj& min,
const BSONObj& max,
const BSONObj& shardKeyPattern) {
scoped_lock lk(_mutex);
if (_active) {
return Status(ErrorCodes::ConflictingOperationInProgress,
str::stream() << "Active migration already in progress "
<< "ns: " << _ns
<< ", from: " << _from
<< ", min: " << _min
<< ", max: " << _max);
}
_state = READY;
_errmsg = "";
_ns = ns;
_from = fromShard;
_min = min;
_max = max;
_shardKeyPattern = shardKeyPattern;
_numCloned = 0;
_clonedBytes = 0;
_numCatchup = 0;
_numSteady = 0;
_active = true;
return Status::OK();
}
void go(OperationContext* txn,
const std::string& ns,
BSONObj min,
BSONObj max,
BSONObj shardKeyPattern,
const std::string& fromShard,
const OID& epoch,
const WriteConcernOptions& writeConcern) {
try {
_go(txn, ns, min, max, shardKeyPattern, fromShard, epoch, writeConcern);
}
catch ( std::exception& e ) {
{
scoped_lock sl(_mutex);
_state = FAIL;
_errmsg = e.what();
}
error() << "migrate failed: " << e.what() << migrateLog;
}
catch ( ... ) {
{
scoped_lock sl(_mutex);
_state = FAIL;
_errmsg = "UNKNOWN ERROR";
}
error() << "migrate failed with unknown exception" << migrateLog;
}
if ( getState() != DONE ) {
// Unprotect the range if needed/possible on unsuccessful TO migration
ScopedTransaction transaction(txn, MODE_IX);
Lock::DBLock dbLock(txn->lockState(), nsToDatabaseSubstring(ns), MODE_IX);
Lock::CollectionLock collLock(txn->lockState(), ns, MODE_X);
string errMsg;
if (!shardingState.forgetPending(txn, ns, min, max, epoch, &errMsg)) {
warning() << errMsg << endl;
}
}
setActive( false );
}
void _go(OperationContext* txn,
const std::string& ns,
BSONObj min,
BSONObj max,
BSONObj shardKeyPattern,
const std::string& fromShard,
const OID& epoch,
const WriteConcernOptions& writeConcern) {
verify( getActive() );
verify( getState() == READY );
verify( ! min.isEmpty() );
verify( ! max.isEmpty() );
log() << "starting receiving-end of migration of chunk " << min << " -> " << max <<
" for collection " << ns << " from " << fromShard
<< " at epoch " << epoch.toString() << endl;
string errmsg;
MoveTimingHelper timing(txn, "to", ns, min, max, 5 /* steps */, &errmsg, "", "");
ScopedDbConnection conn(fromShard);
conn->getLastError(); // just test connection
{
// 0. copy system.namespaces entry if collection doesn't already exist
Client::WriteContext ctx(txn, ns );
// Only copy if ns doesn't already exist
Database* db = ctx.ctx().db();
Collection* collection = db->getCollection( ns );
if ( !collection ) {
list<BSONObj> infos =
conn->getCollectionInfos(nsToDatabase(ns),
BSON("name" << nsToCollectionSubstring(ns)));
BSONObj options;
if (infos.size() > 0) {
BSONObj entry = infos.front();
if (entry["options"].isABSONObj()) {
options = entry["options"].Obj();
}
}
WriteUnitOfWork wuow(txn);
Status status = userCreateNS( txn, db, ns, options, true, false );
if ( !status.isOK() ) {
warning() << "failed to create collection [" << ns << "] "
<< " with options " << options << ": " << status;
}
wuow.commit();
}
}
{
// 1. copy indexes
vector<BSONObj> indexSpecs;
{
const std::list<BSONObj> indexes = conn->getIndexSpecs(ns);
indexSpecs.insert(indexSpecs.begin(), indexes.begin(), indexes.end());
}
ScopedTransaction transaction(txn, MODE_IX);
Lock::DBLock lk(txn->lockState(), nsToDatabaseSubstring(ns), MODE_X);
Client::Context ctx(txn, ns);
Database* db = ctx.db();
Collection* collection = db->getCollection( ns );
if ( !collection ) {
errmsg = str::stream() << "collection dropped during migration: " << ns;
warning() << errmsg;
setState(FAIL);
return;
}
MultiIndexBlock indexer(txn, collection);
indexer.removeExistingIndexes(&indexSpecs);
if (!indexSpecs.empty()) {
// Only copy indexes if the collection does not have any documents.
if (collection->numRecords(txn) > 0) {
errmsg = str::stream() << "aborting migration, shard is missing "
<< indexSpecs.size() << " indexes and "
<< "collection is not empty. Non-trivial "
<< "index creation should be scheduled manually";
warning() << errmsg;
setState(FAIL);
return;
}
Status status = indexer.init(indexSpecs);
if ( !status.isOK() ) {
errmsg = str::stream() << "failed to create index before migrating data. "
<< " error: " << status.toString();
warning() << errmsg;
setState(FAIL);
return;
}
status = indexer.insertAllDocumentsInCollection();
if ( !status.isOK() ) {
errmsg = str::stream() << "failed to create index before migrating data. "
<< " error: " << status.toString();
warning() << errmsg;
setState(FAIL);
return;
}
WriteUnitOfWork wunit(txn);
indexer.commit();
for (size_t i = 0; i < indexSpecs.size(); i++) {
// make sure to create index on secondaries as well
repl::logOp(txn, "i", db->getSystemIndexesName().c_str(), indexSpecs[i],
NULL, NULL, true /* fromMigrate */);
}
wunit.commit();
}
timing.done(1);
MONGO_FP_PAUSE_WHILE(migrateThreadHangAtStep1);
}
{
// 2. delete any data already in range
RangeDeleterOptions deleterOptions(KeyRange(ns,
min.getOwned(),
max.getOwned(),
shardKeyPattern));
deleterOptions.writeConcern = writeConcern;
// No need to wait since all existing cursors will filter out this range when
// returning the results.
deleterOptions.waitForOpenCursors = false;
deleterOptions.fromMigrate = true;
deleterOptions.onlyRemoveOrphanedDocs = true;
deleterOptions.removeSaverReason = "preCleanup";
string errMsg;
if (!getDeleter()->deleteNow(txn, deleterOptions, &errMsg)) {
warning() << "Failed to queue delete for migrate abort: " << errMsg << endl;
setState(FAIL);
return;
}
{
// Protect the range by noting that we're now starting a migration to it
ScopedTransaction transaction(txn, MODE_IX);
Lock::DBLock dbLock(txn->lockState(), nsToDatabaseSubstring(ns), MODE_IX);
Lock::CollectionLock collLock(txn->lockState(), ns, MODE_X);
if (!shardingState.notePending(txn, ns, min, max, epoch, &errmsg)) {
warning() << errmsg << endl;
setState(FAIL);
return;
}
}
timing.done(2);
MONGO_FP_PAUSE_WHILE(migrateThreadHangAtStep2);
}
State currentState = getState();
if (currentState == FAIL || currentState == ABORT) {
string errMsg;
RangeDeleterOptions deleterOptions(KeyRange(ns,
min.getOwned(),
max.getOwned(),
shardKeyPattern));
deleterOptions.writeConcern = writeConcern;
// No need to wait since all existing cursors will filter out this range when
// returning the results.
deleterOptions.waitForOpenCursors = false;
deleterOptions.fromMigrate = true;
deleterOptions.onlyRemoveOrphanedDocs = true;
if (!getDeleter()->queueDelete(txn, deleterOptions, NULL /* notifier */, &errMsg)) {
warning() << "Failed to queue delete for migrate abort: " << errMsg << endl;
}
}
{
// 3. initial bulk clone
setState(CLONE);
while ( true ) {
BSONObj res;
if ( ! conn->runCommand( "admin" , BSON( "_migrateClone" << 1 ) , res ) ) { // gets array of objects to copy, in disk order
setState(FAIL);
errmsg = "_migrateClone failed: ";
errmsg += res.toString();
error() << errmsg << migrateLog;
conn.done();
return;
}
BSONObj arr = res["objects"].Obj();
int thisTime = 0;
BSONObjIterator i( arr );
while( i.more() ) {
txn->checkForInterrupt();
if ( getState() == ABORT ) {
errmsg = str::stream() << "Migration abort requested while "
<< "copying documents";
error() << errmsg << migrateLog;
return;
}
BSONObj docToClone = i.next().Obj();
{
Client::WriteContext cx(txn, ns );
BSONObj localDoc;
if (willOverrideLocalId(txn,
ns,
min,
max,
shardKeyPattern,
cx.ctx().db(),
docToClone,
&localDoc)) {
string errMsg =
str::stream() << "cannot migrate chunk, local document "
<< localDoc
<< " has same _id as cloned "
<< "remote document " << docToClone;
warning() << errMsg << endl;
// Exception will abort migration cleanly
uasserted( 16976, errMsg );
}
Helpers::upsert( txn, ns, docToClone, true );
}
thisTime++;
{
scoped_lock statsLock(_mutex);
_numCloned++;
_clonedBytes += docToClone.objsize();
}
if (writeConcern.shouldWaitForOtherNodes() && thisTime > 0) {
repl::ReplicationCoordinator::StatusAndDuration replStatus =
repl::getGlobalReplicationCoordinator()->awaitReplication(
txn,
txn->getClient()->getLastOp(),
writeConcern);
if (replStatus.status.code() == ErrorCodes::ExceededTimeLimit) {
warning() << "secondaryThrottle on, but doc insert timed out; "
"continuing";
}
else {
massertStatusOK(replStatus.status);
}
}
}
if ( thisTime == 0 )
break;
}
timing.done(3);
MONGO_FP_PAUSE_WHILE(migrateThreadHangAtStep3);
}
// if running on a replicated system, we'll need to flush the docs we cloned to the secondaries
ReplTime lastOpApplied = txn->getClient()->getLastOp().asDate();
{
// 4. do bulk of mods
setState(CATCHUP);
while ( true ) {
BSONObj res;
if ( ! conn->runCommand( "admin" , BSON( "_transferMods" << 1 ) , res ) ) {
setState(FAIL);
errmsg = "_transferMods failed: ";
errmsg += res.toString();
error() << "_transferMods failed: " << res << migrateLog;
conn.done();
return;
}
if ( res["size"].number() == 0 )
break;
apply(txn, ns, min, max, shardKeyPattern, res, &lastOpApplied);
const int maxIterations = 3600*50;
int i;
for ( i=0;i<maxIterations; i++) {
txn->checkForInterrupt();
if ( getState() == ABORT ) {
errmsg = str::stream() << "Migration abort requested while waiting "
<< "for replication at catch up stage";
error() << errmsg << migrateLog;
return;
}
if (opReplicatedEnough(txn, lastOpApplied, writeConcern))
break;
if ( i > 100 ) {
warning() << "secondaries having hard time keeping up with migrate" << migrateLog;
}
sleepmillis( 20 );
}
if ( i == maxIterations ) {
errmsg = "secondary can't keep up with migrate";
error() << errmsg << migrateLog;
conn.done();
setState(FAIL);
return;
}
}
timing.done(4);
MONGO_FP_PAUSE_WHILE(migrateThreadHangAtStep4);
}
{
// pause to wait for replication
// this will prevent us from going into critical section until we're ready
Timer t;
while ( t.minutes() < 600 ) {
txn->checkForInterrupt();
if (getState() == ABORT) {
errmsg = "Migration abort requested while waiting for replication";
error() << errmsg << migrateLog;
return;
}
log() << "Waiting for replication to catch up before entering critical section"
<< endl;
if (flushPendingWrites(txn, ns, min, max, lastOpApplied, writeConcern))
break;
sleepsecs(1);
}
if (t.minutes() >= 600) {
setState(FAIL);
errmsg = "Cannot go to critical section because secondaries cannot keep up";
error() << errmsg << migrateLog;
return;
}
}
{
// 5. wait for commit
setState(STEADY);
bool transferAfterCommit = false;
while ( getState() == STEADY || getState() == COMMIT_START ) {
txn->checkForInterrupt();
// Make sure we do at least one transfer after recv'ing the commit message
// If we aren't sure that at least one transfer happens *after* our state
// changes to COMMIT_START, there could be mods still on the FROM shard that
// got logged *after* our _transferMods but *before* the critical section.
if ( getState() == COMMIT_START ) transferAfterCommit = true;
BSONObj res;
if ( ! conn->runCommand( "admin" , BSON( "_transferMods" << 1 ) , res ) ) {
log() << "_transferMods failed in STEADY state: " << res << migrateLog;
errmsg = res.toString();
setState(FAIL);
conn.done();
return;
}
if (res["size"].number() > 0 &&
apply(txn, ns, min, max, shardKeyPattern, res, &lastOpApplied)) {
continue;
}
if ( getState() == ABORT ) {
return;
}
// We know we're finished when:
// 1) The from side has told us that it has locked writes (COMMIT_START)
// 2) We've checked at least one more time for un-transmitted mods
if ( getState() == COMMIT_START && transferAfterCommit == true ) {
if (flushPendingWrites(txn, ns, min, max, lastOpApplied, writeConcern))
break;
}
// Only sleep if we aren't committing
if ( getState() == STEADY ) sleepmillis( 10 );
}
if ( getState() == FAIL ) {
errmsg = "timed out waiting for commit";
return;
}
timing.done(5);
MONGO_FP_PAUSE_WHILE(migrateThreadHangAtStep5);
}
setState(DONE);
conn.done();
}
void status(BSONObjBuilder& b) {
scoped_lock sl(_mutex);
b.appendBool("active", _active);
b.append("ns", _ns);
b.append("from", _from);
b.append("min", _min);
b.append("max", _max);
b.append("shardKeyPattern", _shardKeyPattern);
b.append("state", stateToString(_state));
if (_state == FAIL) {
b.append("errmsg", _errmsg);
}
BSONObjBuilder bb(b.subobjStart("counts"));
bb.append("cloned", _numCloned);
bb.append("clonedBytes", _clonedBytes);
bb.append("catchup", _numCatchup);
bb.append("steady", _numSteady);
bb.done();
}
bool apply(OperationContext* txn,
const string& ns,
BSONObj min,
BSONObj max,
BSONObj shardKeyPattern,
const BSONObj& xfer,
ReplTime* lastOpApplied) {
ReplTime dummy;
if ( lastOpApplied == NULL ) {
lastOpApplied = &dummy;
}
bool didAnything = false;
if ( xfer["deleted"].isABSONObj() ) {
ScopedTransaction transaction(txn, MODE_IX);
Lock::DBLock dlk(txn->lockState(), nsToDatabaseSubstring(ns), MODE_IX);
Helpers::RemoveSaver rs( "moveChunk" , ns , "removedDuring" );
BSONObjIterator i( xfer["deleted"].Obj() );
while ( i.more() ) {
Lock::CollectionLock clk(txn->lockState(), ns, MODE_X);
Client::Context ctx(txn, ns);
BSONObj id = i.next().Obj();
// do not apply deletes if they do not belong to the chunk being migrated
BSONObj fullObj;
if (Helpers::findById(txn, ctx.db(), ns.c_str(), id, fullObj)) {
if (!isInRange(fullObj , min , max , shardKeyPattern)) {
log() << "not applying out of range deletion: " << fullObj << migrateLog;
continue;
}
}
if (serverGlobalParams.moveParanoia) {
rs.goingToDelete(fullObj);
}
deleteObjects(txn,
ctx.db(),
ns,
id,
PlanExecutor::YIELD_MANUAL,
true /* justOne */,
true /* logOp */,
false /* god */,
true /* fromMigrate */);
*lastOpApplied = ctx.getClient()->getLastOp().asDate();
didAnything = true;
}
}
if ( xfer["reload"].isABSONObj() ) {
BSONObjIterator i( xfer["reload"].Obj() );
while ( i.more() ) {
Client::WriteContext cx(txn, ns);
BSONObj updatedDoc = i.next().Obj();
BSONObj localDoc;
if (willOverrideLocalId(txn,
ns,
min,
max,
shardKeyPattern,
cx.ctx().db(),
updatedDoc,
&localDoc)) {
string errMsg =
str::stream() << "cannot migrate chunk, local document "
<< localDoc
<< " has same _id as reloaded remote document "
<< updatedDoc;
warning() << errMsg << endl;
// Exception will abort migration cleanly
uasserted( 16977, errMsg );
}
// We are in write lock here, so sure we aren't killing
Helpers::upsert( txn, ns , updatedDoc , true );
*lastOpApplied = cx.ctx().getClient()->getLastOp().asDate();
didAnything = true;
}
}
return didAnything;
}
/**
* Checks if an upsert of a remote document will override a local document with the same _id
* but in a different range on this shard.
* Must be in WriteContext to avoid races and DBHelper errors.
* TODO: Could optimize this check out if sharding on _id.
*/
bool willOverrideLocalId(OperationContext* txn,
const string& ns,
BSONObj min,
BSONObj max,
BSONObj shardKeyPattern,
Database* db,
BSONObj remoteDoc,
BSONObj* localDoc) {
*localDoc = BSONObj();
if ( Helpers::findById( txn, db, ns.c_str(), remoteDoc, *localDoc ) ) {
return !isInRange( *localDoc , min , max , shardKeyPattern );
}
return false;
}
/**
* Returns true if the majority of the nodes and the nodes corresponding to the given
* writeConcern (if not empty) have applied till the specified lastOp.
*/
bool opReplicatedEnough(const OperationContext* txn,
const ReplTime& lastOpApplied,
const WriteConcernOptions& writeConcern) {
WriteConcernOptions majorityWriteConcern;
majorityWriteConcern.wTimeout = -1;
majorityWriteConcern.wMode = "majority";
Status majorityStatus = repl::getGlobalReplicationCoordinator()->awaitReplication(
txn, lastOpApplied, majorityWriteConcern).status;
if (!writeConcern.shouldWaitForOtherNodes()) {
return majorityStatus.isOK();
}
// Also enforce the user specified write concern after "majority" so it covers
// the union of the 2 write concerns.
WriteConcernOptions userWriteConcern(writeConcern);
userWriteConcern.wTimeout = -1;
Status userStatus = repl::getGlobalReplicationCoordinator()->awaitReplication(
txn, lastOpApplied, userWriteConcern).status;
return majorityStatus.isOK() && userStatus.isOK();
}
bool flushPendingWrites(OperationContext* txn,
const std::string& ns,
BSONObj min,
BSONObj max,
const ReplTime& lastOpApplied,
const WriteConcernOptions& writeConcern) {
if (!opReplicatedEnough(txn, lastOpApplied, writeConcern)) {
OpTime op( lastOpApplied );
OCCASIONALLY warning() << "migrate commit waiting for a majority of slaves for '"
<< ns << "' " << min << " -> " << max
<< " waiting for: " << op
<< migrateLog;
return false;
}
log() << "migrate commit succeeded flushing to secondaries for '" << ns << "' " << min << " -> " << max << migrateLog;
{
// Get global lock to wait for write to be commited to journal.
ScopedTransaction transaction(txn, MODE_S);
Lock::GlobalRead lk(txn->lockState());
// if durability is on, force a write to journal
if (getDur().commitNow(txn)) {
log() << "migrate commit flushed to journal for '" << ns << "' " << min << " -> " << max << migrateLog;
}
}
return true;
}
static string stateToString(State state) {
switch (state) {
case READY: return "ready";
case CLONE: return "clone";
case CATCHUP: return "catchup";
case STEADY: return "steady";
case COMMIT_START: return "commitStart";
case DONE: return "done";
case FAIL: return "fail";
case ABORT: return "abort";
}
verify(0);
return "";
}
bool startCommit() {
scoped_lock lock(_mutex);
if (_state != STEADY) {
return false;
}
boost::xtime xt;
boost::xtime_get(&xt, MONGO_BOOST_TIME_UTC);
xt.sec += 30;
_state = COMMIT_START;
while (_active) {
if ( ! isActiveCV.timed_wait( lock.boost(), xt ) ){
// TIMEOUT
setState(FAIL);
log() << "startCommit never finished!" << migrateLog;
return false;
}
}
if (_state == DONE) {
return true;
}
log() << "startCommit failed, final data failed to transfer" << migrateLog;
return false;
}
void abort() {
scoped_lock sl(_mutex);
_state = ABORT;
_errmsg = "aborted";
}
bool getActive() const { scoped_lock lk(_mutex); return _active; }
void setActive( bool b ) {
scoped_lock lk(_mutex);
_active = b;
isActiveCV.notify_all();
}
// Guards all fields.
mutable mongo::mutex _mutex;
bool _active;
boost::condition isActiveCV;
std::string _ns;
std::string _from;
BSONObj _min;
BSONObj _max;
BSONObj _shardKeyPattern;
long long _numCloned;
long long _clonedBytes;
long long _numCatchup;
long long _numSteady;
State _state;
std::string _errmsg;
} migrateStatus;
void migrateThread(std::string ns,
BSONObj min,
BSONObj max,
BSONObj shardKeyPattern,
std::string fromShard,
OID epoch,
WriteConcernOptions writeConcern) {
Client::initThread( "migrateThread" );
OperationContextImpl txn;
if (getGlobalAuthorizationManager()->isAuthEnabled()) {
ShardedConnectionInfo::addHook();
txn.getClient()->getAuthorizationSession()->grantInternalAuthorization();
}
// Make curop active so this will show up in currOp.
txn.getCurOp()->reset();
migrateStatus.go(&txn, ns, min, max, shardKeyPattern, fromShard, epoch, writeConcern);
cc().shutdown();
}
/**
* Command for initiating the recipient side of the migration to start copying data
* from the donor shard.
*
* {
* _recvChunkStart: "namespace",
* congfigServer: "hostAndPort",
* from: "hostAndPort",
* fromShardName: "shardName",
* toShardName: "shardName",
* min: {},
* max: {},
* shardKeyPattern: {},
*
* // optional
* secondaryThrottle: bool, // defaults to true
* writeConcern: {} // applies to individual writes.
* }
*/
class RecvChunkStartCommand : public ChunkCommandHelper {
public:
void help(stringstream& h) const { h << "internal"; }
RecvChunkStartCommand() : ChunkCommandHelper( "_recvChunkStart" ) {}
virtual bool isWriteCommandForConfigServer() const { return false; }
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {
ActionSet actions;
actions.addAction(ActionType::internal);
out->push_back(Privilege(ResourcePattern::forClusterResource(), actions));
}
bool run(OperationContext* txn, const string& , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
// Active state of TO-side migrations (MigrateStatus) is serialized by distributed
// collection lock.
if ( migrateStatus.getActive() ) {
errmsg = "migrate already in progress";
return false;
}
// Pending deletes (for migrations) are serialized by the distributed collection lock,
// we are sure we registered a delete for a range *before* we can migrate-in a
// subrange.
const size_t numDeletes = getDeleter()->getTotalDeletes();
if (numDeletes > 0) {
errmsg = str::stream() << "can't accept new chunks because "
<< " there are still " << numDeletes
<< " deletes from previous migration";
warning() << errmsg;
return false;
}
if (!shardingState.enabled()) {
if (!cmdObj["configServer"].eoo()) {
dassert(cmdObj["configServer"].type() == String);
ShardingState::initialize(cmdObj["configServer"].String());
}
else {
errmsg = str::stream()
<< "cannot start recv'ing chunk, "
<< "sharding is not enabled and no config server was provided";
warning() << errmsg;
return false;
}
}
if ( !cmdObj["toShardName"].eoo() ) {
dassert( cmdObj["toShardName"].type() == String );
shardingState.gotShardName( cmdObj["toShardName"].String() );
}
string ns = cmdObj.firstElement().String();
BSONObj min = cmdObj["min"].Obj().getOwned();
BSONObj max = cmdObj["max"].Obj().getOwned();
// Refresh our collection manager from the config server, we need a collection manager
// to start registering pending chunks.
// We force the remote refresh here to make the behavior consistent and predictable,
// generally we'd refresh anyway, and to be paranoid.
ChunkVersion currentVersion;
Status status = shardingState.refreshMetadataNow(txn, ns, ¤tVersion );
if ( !status.isOK() ) {
errmsg = str::stream() << "cannot start recv'ing chunk "
<< "[" << min << "," << max << ")"
<< causedBy( status.reason() );
warning() << errmsg << endl;
return false;
}
// Process secondary throttle settings and assign defaults if necessary.
WriteConcernOptions writeConcern;
status = writeConcern.parseSecondaryThrottle(cmdObj, NULL);
if (!status.isOK()){
if (status.code() != ErrorCodes::WriteConcernNotDefined) {
warning() << status.toString() << endl;
return appendCommandStatus(result, status);
}
writeConcern = getDefaultWriteConcern();
}
else {
repl::ReplicationCoordinator* replCoordinator =
repl::getGlobalReplicationCoordinator();
if (replCoordinator->getReplicationMode() ==
repl::ReplicationCoordinator::modeMasterSlave &&
writeConcern.shouldWaitForOtherNodes()) {
warning() << "recvChunk cannot check if secondary throttle setting "
<< writeConcern.toBSON()
<< " can be enforced in a master slave configuration";
}
Status status = replCoordinator->checkIfWriteConcernCanBeSatisfied(writeConcern);
if (!status.isOK() && status != ErrorCodes::NoReplicationEnabled) {
warning() << status.toString() << endl;
return appendCommandStatus(result, status);
}
}
if (writeConcern.shouldWaitForOtherNodes() &&
writeConcern.wTimeout == WriteConcernOptions::kNoTimeout) {
// Don't allow no timeout.
writeConcern.wTimeout = kDefaultWTimeoutMs;
}
BSONObj shardKeyPattern;
if (cmdObj.hasField("shardKeyPattern")) {
shardKeyPattern = cmdObj["shardKeyPattern"].Obj().getOwned();
} else {
// shardKeyPattern may not be provided if another shard is from pre 2.2
// In that case, assume the shard key pattern is the same as the range
// specifiers provided.
BSONObj keya = Helpers::inferKeyPattern(min);
BSONObj keyb = Helpers::inferKeyPattern(max);
verify( keya == keyb );
warning() << "No shard key pattern provided by source shard for migration."
" This is likely because the source shard is running a version prior to 2.2."
" Falling back to assuming the shard key matches the pattern of the min and max"
" chunk range specifiers. Inferred shard key: " << keya << endl;
shardKeyPattern = keya.getOwned();
}
const string fromShard(cmdObj["from"].String());
// Set the TO-side migration to active
Status prepareStatus = migrateStatus.prepare(ns, fromShard, min, max, shardKeyPattern);
if (!prepareStatus.isOK()) {
return appendCommandStatus(result, prepareStatus);
}
boost::thread m(migrateThread,
ns,
min,
max,
shardKeyPattern,
fromShard,
currentVersion.epoch(),
writeConcern);
result.appendBool( "started" , true );
return true;
}
} recvChunkStartCmd;
class RecvChunkStatusCommand : public ChunkCommandHelper {
public:
void help(stringstream& h) const { h << "internal"; }
RecvChunkStatusCommand() : ChunkCommandHelper( "_recvChunkStatus" ) {}
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {
ActionSet actions;
actions.addAction(ActionType::internal);
out->push_back(Privilege(ResourcePattern::forClusterResource(), actions));
}
bool run(OperationContext* txn, const string& , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
migrateStatus.status( result );
return 1;
}
} recvChunkStatusCommand;
class RecvChunkCommitCommand : public ChunkCommandHelper {
public:
void help(stringstream& h) const { h << "internal"; }
RecvChunkCommitCommand() : ChunkCommandHelper( "_recvChunkCommit" ) {}
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {
ActionSet actions;
actions.addAction(ActionType::internal);
out->push_back(Privilege(ResourcePattern::forClusterResource(), actions));
}
bool run(OperationContext* txn, const string& , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
bool ok = migrateStatus.startCommit();
migrateStatus.status( result );
return ok;
}
} recvChunkCommitCommand;
class RecvChunkAbortCommand : public ChunkCommandHelper {
public:
void help(stringstream& h) const { h << "internal"; }
RecvChunkAbortCommand() : ChunkCommandHelper( "_recvChunkAbort" ) {}
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {
ActionSet actions;
actions.addAction(ActionType::internal);
out->push_back(Privilege(ResourcePattern::forClusterResource(), actions));
}
bool run(OperationContext* txn, const string& , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
migrateStatus.abort();
migrateStatus.status( result );
return true;
}
} recvChunkAboortCommand;
class IsInRangeTest : public StartupTest {
public:
void run() {
BSONObj min = BSON( "x" << 1 );
BSONObj max = BSON( "x" << 5 );
BSONObj skey = BSON( "x" << 1 );
verify( ! isInRange( BSON( "x" << 0 ) , min , max , skey ) );
verify( isInRange( BSON( "x" << 1 ) , min , max , skey ) );
verify( isInRange( BSON( "x" << 3 ) , min , max , skey ) );
verify( isInRange( BSON( "x" << 4 ) , min , max , skey ) );
verify( ! isInRange( BSON( "x" << 5 ) , min , max , skey ) );
verify( ! isInRange( BSON( "x" << 6 ) , min , max , skey ) );
BSONObj obj = BSON( "n" << 3 );
BSONObj min2 = BSON( "x" << BSONElementHasher::hash64( obj.firstElement() , 0 ) - 2 );
BSONObj max2 = BSON( "x" << BSONElementHasher::hash64( obj.firstElement() , 0 ) + 2 );
BSONObj hashedKey = BSON( "x" << "hashed" );
verify( isInRange( BSON( "x" << 3 ) , min2 , max2 , hashedKey ) );
verify( ! isInRange( BSON( "x" << 3 ) , min , max , hashedKey ) );
verify( ! isInRange( BSON( "x" << 4 ) , min2 , max2 , hashedKey ) );
LOG(1) << "isInRangeTest passed" << migrateLog;
}
} isInRangeTest;
}
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