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// parallel.cpp
#include "stdafx.h"
#include "parallel.h"
#include "connpool.h"
#include "../db/queryutil.h"
#include "../db/dbmessage.h"
#include "../s/util.h"
namespace mongo {
// -------- ClusteredCursor -----------
ClusteredCursor::ClusteredCursor( QueryMessage& q ){
_ns = q.ns;
_query = q.query.copy();
_options = q.queryOptions;
if ( q.fields.get() )
_fields = q.fields->getSpec();
_done = false;
}
ClusteredCursor::ClusteredCursor( const string& ns , const BSONObj& q , int options , const BSONObj& fields ){
_ns = ns;
_query = q.getOwned();
_options = options;
_fields = fields.getOwned();
_done = false;
}
ClusteredCursor::~ClusteredCursor(){
_done = true; // just in case
}
auto_ptr<DBClientCursor> ClusteredCursor::query( const string& server , int num , BSONObj extra ){
uassert( 10017 , "cursor already done" , ! _done );
BSONObj q = _query;
if ( ! extra.isEmpty() ){
q = concatQuery( q , extra );
}
ScopedDbConnection conn( server );
checkShardVersion( conn.conn() , _ns );
log(5) << "ClusteredCursor::query server:" << server << " ns:" << _ns << " query:" << q << " num:" << num << " _fields:" << _fields << " options: " << _options << endl;
auto_ptr<DBClientCursor> cursor = conn->query( _ns.c_str() , q , num , 0 , ( _fields.isEmpty() ? 0 : &_fields ) , _options );
if ( cursor->hasResultFlag( QueryResult::ResultFlag_ShardConfigStale ) )
throw StaleConfigException( _ns , "ClusteredCursor::query" );
conn.done();
return cursor;
}
BSONObj ClusteredCursor::concatQuery( const BSONObj& query , const BSONObj& extraFilter ){
if ( ! query.hasField( "query" ) )
return _concatFilter( query , extraFilter );
BSONObjBuilder b;
BSONObjIterator i( query );
while ( i.more() ){
BSONElement e = i.next();
if ( strcmp( e.fieldName() , "query" ) ){
b.append( e );
continue;
}
b.append( "query" , _concatFilter( e.embeddedObjectUserCheck() , extraFilter ) );
}
return b.obj();
}
BSONObj ClusteredCursor::_concatFilter( const BSONObj& filter , const BSONObj& extra ){
BSONObjBuilder b;
b.appendElements( filter );
b.appendElements( extra );
return b.obj();
// TODO: should do some simplification here if possibl ideally
}
// -------- SerialServerClusteredCursor -----------
SerialServerClusteredCursor::SerialServerClusteredCursor( set<ServerAndQuery> servers , QueryMessage& q , int sortOrder) : ClusteredCursor( q ){
for ( set<ServerAndQuery>::iterator i = servers.begin(); i!=servers.end(); i++ )
_servers.push_back( *i );
if ( sortOrder > 0 )
sort( _servers.begin() , _servers.end() );
else if ( sortOrder < 0 )
sort( _servers.rbegin() , _servers.rend() );
_serverIndex = 0;
}
bool SerialServerClusteredCursor::more(){
if ( _current.get() && _current->more() )
return true;
if ( _serverIndex >= _servers.size() )
return false;
ServerAndQuery& sq = _servers[_serverIndex++];
_current = query( sq._server , 0 , sq._extra );
return _current->more();
}
BSONObj SerialServerClusteredCursor::next(){
uassert( 10018 , "no more items" , more() );
return _current->next();
}
// -------- ParallelSortClusteredCursor -----------
ParallelSortClusteredCursor::ParallelSortClusteredCursor( set<ServerAndQuery> servers , QueryMessage& q ,
const BSONObj& sortKey )
: ClusteredCursor( q ) , _servers( servers ){
_sortKey = sortKey.getOwned();
_init();
}
ParallelSortClusteredCursor::ParallelSortClusteredCursor( set<ServerAndQuery> servers , const string& ns ,
const Query& q ,
int options , const BSONObj& fields )
: ClusteredCursor( ns , q.obj , options , fields ) , _servers( servers ){
_sortKey = q.getSort().copy();
_init();
}
void ParallelSortClusteredCursor::_init(){
_numServers = _servers.size();
_cursors = new auto_ptr<DBClientCursor>[_numServers];
_nexts = new BSONObj[_numServers];
// TODO: parellize
int num = 0;
for ( set<ServerAndQuery>::iterator i = _servers.begin(); i!=_servers.end(); i++ ){
const ServerAndQuery& sq = *i;
_cursors[num++] = query( sq._server , 0 , sq._extra );
}
}
ParallelSortClusteredCursor::~ParallelSortClusteredCursor(){
delete [] _cursors;
delete [] _nexts;
}
bool ParallelSortClusteredCursor::more(){
for ( int i=0; i<_numServers; i++ ){
if ( ! _nexts[i].isEmpty() )
return true;
if ( _cursors[i].get() && _cursors[i]->more() )
return true;
}
return false;
}
BSONObj ParallelSortClusteredCursor::next(){
advance();
BSONObj best = BSONObj();
int bestFrom = -1;
for ( int i=0; i<_numServers; i++){
if ( _nexts[i].isEmpty() )
continue;
if ( best.isEmpty() ){
best = _nexts[i];
bestFrom = i;
continue;
}
int comp = best.woSortOrder( _nexts[i] , _sortKey );
if ( comp < 0 )
continue;
best = _nexts[i];
bestFrom = i;
}
uassert( 10019 , "no more elements" , ! best.isEmpty() );
_nexts[bestFrom] = BSONObj();
return best;
}
void ParallelSortClusteredCursor::advance(){
for ( int i=0; i<_numServers; i++ ){
if ( ! _nexts[i].isEmpty() ){
// already have a good object there
continue;
}
if ( ! _cursors[i]->more() ){
// cursor is dead, oh well
continue;
}
_nexts[i] = _cursors[i]->next();
}
}
// -----------------
// ---- Future -----
// -----------------
Future::CommandResult::CommandResult( const string& server , const string& db , const BSONObj& cmd ){
_server = server;
_db = db;
_cmd = cmd;
_done = false;
}
bool Future::CommandResult::join(){
while ( ! _done )
sleepmicros( 50 );
return _ok;
}
void Future::commandThread(){
assert( _grab );
shared_ptr<CommandResult> res = *_grab;
_grab = 0;
ScopedDbConnection conn( res->_server );
res->_ok = conn->runCommand( res->_db , res->_cmd , res->_res );
res->_done = true;
}
shared_ptr<Future::CommandResult> Future::spawnCommand( const string& server , const string& db , const BSONObj& cmd ){
shared_ptr<Future::CommandResult> res;
res.reset( new Future::CommandResult( server , db , cmd ) );
_grab = &res;
boost::thread thr( Future::commandThread );
while ( _grab )
sleepmicros(2);
return res;
}
shared_ptr<Future::CommandResult> * Future::_grab;
}
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