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/**
* Copyright (C) 2013 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/>.
*/
#include "mongo/base/counter.h"
#include "mongo/db/commands/server_status.h"
#include "mongo/db/lasterror.h"
#include "mongo/db/kill_current_op.h"
#include "mongo/db/repl/is_master.h"
#include "mongo/db/repl/replication_server_status.h"
#include "mongo/db/repl/write_concern.h"
#include "mongo/db/stats/timer_stats.h"
namespace mongo {
static TimerStats gleWtimeStats;
static ServerStatusMetricField<TimerStats> displayGleLatency( "getLastError.wtime", &gleWtimeStats );
static Counter64 gleWtimeouts;
static ServerStatusMetricField<Counter64> gleWtimeoutsDisplay( "getLastError.wtimeouts", &gleWtimeouts );
bool waitForWriteConcern(const BSONObj& cmdObj,
bool err,
BSONObjBuilder* result,
string* errmsg) {
Client& c = cc();
if ( cmdObj["j"].trueValue() ) {
if( !getDur().awaitCommit() ) {
// --journal is off
result->append("jnote", "journaling not enabled on this server");
}
if( cmdObj["fsync"].trueValue() ) {
*errmsg = "fsync and j options are not used together";
return false;
}
}
else if ( cmdObj["fsync"].trueValue() ) {
Timer t;
if( !getDur().awaitCommit() ) {
// if get here, not running with --journal
log() << "fsync from getlasterror" << endl;
result->append( "fsyncFiles" , MemoryMappedFile::flushAll( true ) );
}
else {
// this perhaps is temp. how long we wait for the group commit to occur.
result->append( "waited", t.millis() );
}
}
if ( err ) {
// doesn't make sense to wait for replication
// if there was an error
return true;
}
BSONElement e = cmdObj["w"];
if ( e.ok() ) {
if ( cmdLine.configsvr && (!e.isNumber() || e.numberInt() > 1) ) {
// w:1 on config servers should still work, but anything greater than that
// should not.
result->append( "wnote", "can't use w on config servers" );
result->append( "err", "norepl" );
return true;
}
int timeout = cmdObj["wtimeout"].numberInt();
scoped_ptr<TimerHolder> gleTimerHolder;
bool doTiming = false;
if ( e.isNumber() ) {
doTiming = e.numberInt() > 1;
}
else if ( e.type() == String ) {
doTiming = true;
}
if ( doTiming ) {
gleTimerHolder.reset( new TimerHolder( &gleWtimeStats ) );
}
else {
gleTimerHolder.reset( new TimerHolder( NULL ) );
}
long long passes = 0;
char buf[32];
OpTime op(c.getLastOp());
if ( op.isNull() ) {
if ( anyReplEnabled() ) {
result->append( "wnote" , "no write has been done on this connection" );
}
else if ( e.isNumber() && e.numberInt() <= 1 ) {
// don't do anything
// w=1 and no repl, so this is fine
}
else if (e.type() == mongo::String &&
str::equals(e.valuestrsafe(), "majority")) {
// don't do anything
// w=majority and no repl, so this is fine
}
else {
// w=2 and no repl
stringstream errmsg;
errmsg << "no replication has been enabled, so w=" <<
e.toString(false) << " won't work";
result->append( "wnote" , errmsg.str() );
result->append( "err", "norepl" );
return true;
}
result->appendNull( "err" );
return true;
}
if ( !theReplSet && !e.isNumber() ) {
// For master/slave deployments that receive w:"majority" or some other named
// write concern mode, treat it like w:1 and include a note.
result->append( "wnote", "cannot use non integer w values for non-replica sets" );
result->appendNull( "err" );
return true;
}
while ( 1 ) {
if ( !_isMaster() ) {
// this should be in the while loop in case we step down
*errmsg = "not master";
result->append( "wnote", "no longer primary" );
result->append( "code" , 10990 );
return false;
}
// check this first for w=0 or w=1
if ( opReplicatedEnough( op, e ) ) {
break;
}
// if replication isn't enabled (e.g., config servers)
if ( ! anyReplEnabled() ) {
result->append( "err", "norepl" );
return true;
}
if ( timeout > 0 && gleTimerHolder->millis() >= timeout ) {
gleWtimeouts.increment();
result->append( "wtimeout" , true );
*errmsg = "timed out waiting for slaves";
result->append( "waited" , gleTimerHolder->millis() );
result->append("writtenTo", getHostsWrittenTo(op));
result->append( "err" , "timeout" );
return true;
}
verify( sprintf( buf , "w block pass: %lld" , ++passes ) < 30 );
c.curop()->setMessage( buf );
sleepmillis(1);
killCurrentOp.checkForInterrupt();
}
if ( doTiming ) {
result->append("writtenTo", getHostsWrittenTo(op));
int myMillis = gleTimerHolder->recordMillis();
result->appendNumber( "wtime" , myMillis );
}
}
result->appendNull( "err" );
return true;
}
} // namespace mongo
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