void WriteBackListener::run() {
int secsToSleep = 0;
while ( ! inShutdown() ) {
if ( ! Shard::isAShardNode( _addr ) ) {
log(1) << _addr << " is not a shard node" << endl;
sleepsecs( 60 );
continue;
}
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();
ConnectionIdent cid( "" , 0 );
OID wid;
if ( data["connectionId"].isNumber() && data["id"].type() == jstOID ) {
string s = "";
if ( data["instanceIdent"].type() == String )
s = data["instanceIdent"].String();
cid = ConnectionIdent( s , data["connectionId"].numberLong() );
wid = data["id"].OID();
}
else {
warning() << "mongos/mongod version mismatch (1.7.5 is the split)" << endl;
}
int len; // not used, but needed for next call
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) << "connectionId: " << cid << " writebackId: " << wid << " needVersion : " << needVersion.toString()
<< " mine : " << db->getChunkManager( ns )->getVersion().toString() << endl;// TODO change to log(3)
if ( logLevel ) log(1) << debugString( m ) << endl;
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 ); // SERVER-1349
}
else {
// we received a writeback object that was sent to a previous version of a shard
// the actual shard may not have the object the writeback operation is for
// we need to reload the chunk manager and get the new shard versions
db->getChunkManager( ns , true );
}
// do request and then call getLastError
// we have to call getLastError so we can return the right fields to the user if they decide to call getLastError
BSONObj gle;
try {
Request r( m , 0 );
r.init();
ClientInfo * ci = r.getClientInfo();
if (!noauth) {
ci->getAuthenticationInfo()->authorize("admin", internalSecurity.user);
}
ci->noAutoSplit();
r.process();
ci->newRequest(); // this so we flip prev and cur shards
BSONObjBuilder b;
if ( ! ci->getLastError( BSON( "getLastError" << 1 ) , b , true ) ) {
b.appendBool( "commandFailed" , true );
}
gle = b.obj();
ci->clearSinceLastGetError();
}
catch ( DBException& e ) {
error() << "error processing writeback: " << e << endl;
BSONObjBuilder b;
b.append( "err" , e.toString() );
e.getInfo().append( b );
gle = b.obj();
}
{
scoped_lock lk( _seenWritebacksLock );
WBStatus& s = _seenWritebacks[cid];
s.id = wid;
s.gle = gle;
}
}
else if ( result["noop"].trueValue() ) {
// no-op
}
else {
log() << "unknown writeBack result: " << result << endl;
}
conn.done();
secsToSleep = 0;
continue;
}
catch ( std::exception& e ) {
if ( inShutdown() ) {
// we're shutting down, so just clean up
return;
}
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;
}
void WriteBackListener::run() {
int secsToSleep = 0;
scoped_ptr<ChunkVersion> lastNeededVersion;
int lastNeededCount = 0;
bool needsToReloadShardInfo = false;
while ( ! inShutdown() ) {
if ( ! Shard::isAShardNode( _addr ) ) {
LOG(1) << _addr << " is not a shard node" << endl;
sleepsecs( 60 );
continue;
}
try {
if (needsToReloadShardInfo) {
// It's possible this shard was removed
Shard::reloadShardInfo();
needsToReloadShardInfo = false;
}
scoped_ptr<ScopedDbConnection> conn(
ScopedDbConnection::getInternalScopedDbConnection( _addr ) );
BSONObj result;
{
BSONObjBuilder cmd;
cmd.appendOID( "writebacklisten" , &serverID ); // Command will block for data
if ( ! conn->get()->runCommand( "admin" , cmd.obj() , result ) ) {
result = result.getOwned();
log() << "writebacklisten command failed! " << result << endl;
conn->done();
continue;
}
}
conn->done();
LOG(1) << "writebacklisten result: " << result << endl;
BSONObj data = result.getObjectField( "data" );
if ( data.getBoolField( "writeBack" ) ) {
string ns = data["ns"].valuestrsafe();
ConnectionIdent cid( "" , 0 );
OID wid;
if ( data["connectionId"].isNumber() && data["id"].type() == jstOID ) {
string s = "";
if ( data["instanceIdent"].type() == String )
s = data["instanceIdent"].String();
cid = ConnectionIdent( s , data["connectionId"].numberLong() );
wid = data["id"].OID();
}
else {
warning() << "mongos/mongod version mismatch (1.7.5 is the split)" << endl;
}
int len; // not used, but needed for next call
Message msg( (void*)data["msg"].binData( len ) , false );
massert( 10427 , "invalid writeback message" , msg.header()->valid() );
DBConfigPtr db = grid.getDBConfig( ns );
ChunkVersion needVersion = ChunkVersion::fromBSON( data, "version" );
//
// TODO: Refactor the sharded strategy to correctly handle all sharding state changes itself,
// we can't rely on WBL to do this for us b/c anything could reset our state in-between.
// We should always reload here for efficiency when possible, but staleness is also caught in the
// loop below.
//
ChunkManagerPtr manager;
ShardPtr primary;
db->getChunkManagerOrPrimary( ns, manager, primary );
ChunkVersion currVersion;
if( manager ) currVersion = manager->getVersion();
LOG(1) << "connectionId: " << cid << " writebackId: " << wid << " needVersion : " << needVersion.toString()
<< " mine : " << currVersion.toString() << endl;
LOG(1) << msg.toString() << endl;
//
// We should reload only if we need to update our version to be compatible *and* we
// haven't already done so. This avoids lots of reloading when we remove/add a sharded collection
//
bool alreadyReloaded = lastNeededVersion &&
lastNeededVersion->isEquivalentTo( needVersion );
if( alreadyReloaded ){
LOG(1) << "wbl already reloaded config information for version "
<< needVersion << ", at version " << currVersion << endl;
}
else if( lastNeededVersion ) {
log() << "new version change detected to " << needVersion.toString()
<< ", " << lastNeededCount << " writebacks processed at "
<< lastNeededVersion->toString() << endl;
lastNeededCount = 0;
}
//
// Set our lastNeededVersion for next time
//
lastNeededVersion.reset( new ChunkVersion( needVersion ) );
lastNeededCount++;
//
// Determine if we should reload, if so, reload
//
bool shouldReload = ! needVersion.isWriteCompatibleWith( currVersion ) &&
! alreadyReloaded;
if( shouldReload && currVersion.isSet()
&& needVersion.isSet()
&& currVersion.hasCompatibleEpoch( needVersion ) )
{
//
// If we disagree about versions only, reload the chunk manager
//
db->getChunkManagerIfExists( ns, true );
}
else if( shouldReload ){
//
// If we disagree about anything else, reload the full db
//
warning() << "reloading config data for " << db->getName() << ", "
<< "wanted version " << needVersion.toString()
<< " but currently have version " << currVersion.toString() << endl;
db->reload();
}
// do request and then call getLastError
// we have to call getLastError so we can return the right fields to the user if they decide to call getLastError
BSONObj gle;
int attempts = 0;
while ( true ) {
attempts++;
try {
Request r( msg , 0 );
r.init();
r.d().reservedField() |= Reserved_FromWriteback;
ClientInfo * ci = r.getClientInfo();
if (!noauth) {
ci->getAuthorizationManager()->grantInternalAuthorization(
"_writebackListener");
}
ci->noAutoSplit();
r.process( attempts );
ci->newRequest(); // this so we flip prev and cur shards
BSONObjBuilder b;
string errmsg;
if ( ! ci->getLastError( "admin",
BSON( "getLastError" << 1 ),
b,
errmsg,
true ) )
{
b.appendBool( "commandFailed" , true );
if( ! b.hasField( "errmsg" ) ){
b.append( "errmsg", errmsg );
gle = b.obj();
}
else if( errmsg.size() > 0 ){
// Rebuild GLE object with errmsg
// TODO: Make this less clumsy by improving GLE interface
gle = b.obj();
if( gle["errmsg"].type() == String ){
BSONObj gleNoErrmsg =
gle.filterFieldsUndotted( BSON( "errmsg" << 1 ),
false );
BSONObjBuilder bb;
bb.appendElements( gleNoErrmsg );
bb.append( "errmsg", gle["errmsg"].String() +
" ::and:: " +
errmsg );
gle = bb.obj().getOwned();
}
}
}
else{
gle = b.obj();
}
if ( gle["code"].numberInt() == 9517 ) {
log() << "new version change detected, "
<< lastNeededCount << " writebacks processed previously" << endl;
lastNeededVersion.reset();
lastNeededCount = 1;
log() << "writeback failed because of stale config, retrying attempts: " << attempts << endl;
LOG(1) << "writeback error : " << gle << endl;
//
// Bringing this in line with the similar retry logic elsewhere
//
// TODO: Reloading the chunk manager may not help if we dropped a
// collection, but we don't actually have that info in the writeback
// error
//
if( attempts <= 2 ){
db->getChunkManagerIfExists( ns, true );
}
else{
versionManager.forceRemoteCheckShardVersionCB( ns );
sleepsecs( attempts - 1 );
}
uassert( 15884, str::stream()
<< "Could not reload chunk manager after "
<< attempts << " attempts.", attempts <= 4 );
continue;
}
ci->clearSinceLastGetError();
}
catch ( DBException& e ) {
error() << "error processing writeback: " << e << endl;
BSONObjBuilder b;
e.getInfo().append( b, "err", "code" );
gle = b.obj();
}
break;
}
{
scoped_lock lk( _seenWritebacksLock );
WBStatus& s = _seenWritebacks[cid];
s.id = wid;
s.gle = gle;
}
}
else if ( result["noop"].trueValue() ) {
// no-op
}
else {
log() << "unknown writeBack result: " << result << endl;
}
secsToSleep = 0;
continue;
}
catch ( std::exception& e ) {
// Attention! Do not call any method that would throw an exception
// (or assert) in this block.
if ( inShutdown() ) {
// we're shutting down, so just clean up
return;
}
log() << "WriteBackListener exception : " << e.what() << endl;
needsToReloadShardInfo = true;
}
catch ( ... ) {
log() << "WriteBackListener uncaught exception!" << endl;
}
secsToSleep++;
sleepsecs(secsToSleep);
if ( secsToSleep > 10 )
secsToSleep = 0;
}
log() << "WriteBackListener exiting : address no longer in cluster " << _addr;
}