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/*
* Copyright (C) 2010 10gen 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/>.
*/
// stragegy.cpp
#include "pch.h"
#include "request.h"
#include "../util/background.h"
#include "../client/connpool.h"
#include "../db/commands.h"
#include "server.h"
namespace mongo {
// ----- Strategy ------
void Strategy::doWrite( int op , Request& r , const Shard& shard ){
ShardConnection dbcon( shard , r.getns() );
DBClientBase &_c = dbcon.conn();
/* TODO FIX - do not case and call DBClientBase::say() */
DBClientConnection&c = dynamic_cast<DBClientConnection&>(_c);
c.port().say( r.m() );
dbcon.done();
}
void Strategy::doQuery( Request& r , const Shard& shard ){
try{
ShardConnection dbcon( shard , r.getns() );
DBClientBase &c = dbcon.conn();
Message response;
bool ok = c.call( r.m(), response);
{
QueryResult *qr = (QueryResult *) response.singleData();
if ( qr->resultFlags() & QueryResult::ResultFlag_ShardConfigStale ){
dbcon.done();
throw StaleConfigException( r.getns() , "Strategy::doQuery" );
}
}
uassert( 10200 , "mongos: error calling db", ok);
r.reply( response , c.getServerAddress() );
dbcon.done();
}
catch ( AssertionException& e ) {
BSONObjBuilder err;
e.getInfo().append( err );
BSONObj errObj = err.done();
replyToQuery(QueryResult::ResultFlag_ErrSet, r.p() , r.m() , errObj);
}
}
void Strategy::insert( const Shard& shard , const char * ns , const BSONObj& obj ){
ShardConnection dbcon( shard , ns );
if ( dbcon.setVersion() ){
dbcon.done();
throw StaleConfigException( ns , "for insert" );
}
dbcon->insert( ns , obj );
dbcon.done();
}
map< pair<DBClientBase*,string> ,unsigned long long> checkShardVersionLastSequence;
class WriteBackListener : public BackgroundJob {
protected:
string name() { return "WriteBackListener"; }
WriteBackListener( const string& addr ) : _addr( addr ){
cout << "creating WriteBackListener for: " << addr << endl;
}
void run(){
int secsToSleep = 0;
while ( Shard::isMember( _addr ) ){
try {
ScopedDbConnection conn( _addr );
BSONObj result;
{
BSONObjBuilder cmd;
cmd.appendOID( "writebacklisten" , &serverID ); // Command will block for data
if ( ! conn->runCommand( "admin" , cmd.obj() , result ) ){
log() << "writebacklisten command failed! " << result << endl;
conn.done();
continue;
}
}
log(1) << "writebacklisten result: " << result << endl;
BSONObj data = result.getObjectField( "data" );
if ( data.getBoolField( "writeBack" ) ){
string ns = data["ns"].valuestrsafe();
int len;
Message m( (void*)data["msg"].binData( len ) , false );
massert( 10427 , "invalid writeback message" , m.header()->valid() );
DBConfigPtr db = grid.getDBConfig( ns );
ShardChunkVersion needVersion( data["version"] );
log(1) << "writeback needVersion : " << needVersion.toString() << " mine : " << db->getChunkManager( ns )->getVersion().toString() << endl;// TODO change to log(3)
if ( needVersion.isSet() && needVersion <= db->getChunkManager( ns )->getVersion() ){
// this means when the write went originally, the version was old
// if we're here, it means we've already updated the config, so don't need to do again
db->getChunkManager( ns , true ); // TEMP TEMP TEMP ERH
}
else {
db->getChunkManager( ns , true );
}
Request r( m , 0 );
r.process();
}
else {
log() << "unknown writeBack result: " << result << endl;
}
conn.done();
secsToSleep = 0;
continue;
}
catch ( std::exception e ){
log() << "WriteBackListener exception : " << e.what() << endl;
// It's possible this shard was removed
Shard::reloadShardInfo();
}
catch ( ... ){
log() << "WriteBackListener uncaught exception!" << endl;
}
secsToSleep++;
sleepsecs(secsToSleep);
if ( secsToSleep > 10 )
secsToSleep = 0;
}
log() << "WriteBackListener exiting : address no longer in cluster " << _addr;
}
private:
string _addr;
static map<string,WriteBackListener*> _cache;
static mongo::mutex _lock;
public:
static void init( DBClientBase& conn ){
scoped_lock lk( _lock );
WriteBackListener*& l = _cache[conn.getServerAddress()];
if ( l )
return;
l = new WriteBackListener( conn.getServerAddress() );
l->go();
}
};
map<string,WriteBackListener*> WriteBackListener::_cache;
mongo::mutex WriteBackListener::_lock("WriteBackListener");
/**
* @return true if had to do something
*/
bool checkShardVersion( DBClientBase& conn , const string& ns , bool authoritative ){
// TODO: cache, optimize, etc...
WriteBackListener::init( conn );
DBConfigPtr conf = grid.getDBConfig( ns );
if ( ! conf )
return false;
ShardChunkVersion version = 0;
unsigned long long officialSequenceNumber = 0;
ChunkManagerPtr manager;
const bool isSharded = conf->isSharded( ns );
if ( isSharded ){
manager = conf->getChunkManager( ns , authoritative );
officialSequenceNumber = manager->getSequenceNumber();
}
unsigned long long & sequenceNumber = checkShardVersionLastSequence[ make_pair(&conn,ns) ];
if ( sequenceNumber == officialSequenceNumber )
return false;
if ( isSharded ){
version = manager->getVersion( Shard::make( conn.getServerAddress() ) );
}
log(2) << " have to set shard version for conn: " << &conn << " ns:" << ns
<< " my last seq: " << sequenceNumber << " current: " << officialSequenceNumber
<< " version: " << version << " manager: " << manager.get()
<< endl;
BSONObj result;
if ( setShardVersion( conn , ns , version , authoritative , result ) ){
// success!
log(1) << " setShardVersion success!" << endl;
sequenceNumber = officialSequenceNumber;
dassert( sequenceNumber == checkShardVersionLastSequence[ make_pair(&conn,ns) ] );
return true;
}
log(1) << " setShardVersion failed!\n" << result << endl;
if ( result.getBoolField( "need_authoritative" ) )
massert( 10428 , "need_authoritative set but in authoritative mode already" , ! authoritative );
if ( ! authoritative ){
checkShardVersion( conn , ns , 1 );
return true;
}
log() << " setShardVersion failed: " << result << endl;
massert( 10429 , (string)"setShardVersion failed! " + result.jsonString() , 0 );
return true;
}
}
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