/**
* Special internal logic to run reduced version handshake for empty namespace operations to
* shards.
*
* Eventually this should go completely away, but for now many commands rely on unversioned but
* mongos-specific behavior on mongod (auditing and replication information in commands)
*/
static bool initShardVersionEmptyNS(DBClientBase* conn_in) {
bool ok;
BSONObj result;
DBClientBase* conn = NULL;
try {
// May throw if replica set primary is down
conn = getVersionable(conn_in);
dassert(conn); // errors thrown above
// Check to see if we've already initialized this connection
if (connectionShardStatus.hasAnySequenceSet(conn))
return false;
// Check to see if this is actually a shard and not a single config server
// NOTE: Config servers are registered only by the name "config" in the shard cache, not
// by host, so lookup by host will fail unless the host is also a shard.
const auto shard = grid.shardRegistry()->getShard(conn->getServerAddress());
if (!shard) {
return false;
}
LOG(1) << "initializing shard connection to " << shard->toString() << endl;
ok = setShardVersion(*conn,
"",
grid.catalogManager()->connectionString().toString(),
ChunkVersion(),
NULL,
true,
result);
} catch (const DBException&) {
// NOTE: Replica sets may fail to initShardVersion because future calls relying on
// correct versioning must later call checkShardVersion on the primary.
// Secondary queries and commands may not call checkShardVersion, but secondary ops
// aren't versioned at all.
if (conn_in->type() != ConnectionString::SET) {
throw;
}
// NOTE: Only old-style cluster operations will talk via DBClientReplicaSets - using
// checkShardVersion is required (which includes initShardVersion information) if these
// connections are used.
OCCASIONALLY {
warning() << "failed to initialize new replica set connection version, "
<< "will initialize on first use" << endl;
}
return false;
}
// Record the connection wire version if sent in the response, initShardVersion is a
// handshake for mongos->mongod connections.
if (!result["minWireVersion"].eoo()) {
int minWireVersion = result["minWireVersion"].numberInt();
int maxWireVersion = result["maxWireVersion"].numberInt();
conn->setWireVersions(minWireVersion, maxWireVersion);
}
LOG(3) << "initial sharding result : " << result << endl;
connectionShardStatus.setSequence(conn, "", 0);
return ok;
}
bool VersionManager::initShardVersionCB( DBClientBase * conn_in, BSONObj& result ){
WriteBackListener::init( *conn_in );
bool ok;
DBClientBase* conn = NULL;
try {
// May throw if replica set primary is down
conn = getVersionable( conn_in );
dassert( conn ); // errors thrown above
BSONObjBuilder cmdBuilder;
cmdBuilder.append( "setShardVersion" , "" );
cmdBuilder.appendBool( "init", true );
cmdBuilder.append( "configdb" , configServer.modelServer() );
cmdBuilder.appendOID( "serverID" , &serverID );
cmdBuilder.appendBool( "authoritative" , true );
BSONObj cmd = cmdBuilder.obj();
LOG(1) << "initializing shard connection to " << conn->toString() << endl;
LOG(2) << "initial sharding settings : " << cmd << endl;
ok = conn->runCommand("admin", cmd, result, 0);
}
catch( const DBException& ) {
if ( conn_in->type() != ConnectionString::SET ) {
throw;
}
// NOTE: Only old-style cluster operations will talk via DBClientReplicaSets - using
// checkShardVersion is required (which includes initShardVersion information) if these
// connections are used.
OCCASIONALLY {
warning() << "failed to initialize new replica set connection version, "
<< "will initialize on first use" << endl;
}
return true;
}
// HACK for backwards compatibility with v1.8.x, v2.0.0 and v2.0.1
// Result is false, but will still initialize serverID and configdb
if( ! ok && ! result["errmsg"].eoo() && ( result["errmsg"].String() == "need to specify namespace"/* 2.0.1/2 */ ||
result["errmsg"].String() == "need to speciy namespace" /* 1.8 */ ))
{
ok = true;
}
// Record the connection wire version if sent in the response, initShardVersion is a
// handshake for mongos->mongod connections.
if ( !result["minWireVersion"].eoo() ) {
int minWireVersion = result["minWireVersion"].numberInt();
int maxWireVersion = result["maxWireVersion"].numberInt();
conn->setWireVersions( minWireVersion, maxWireVersion );
}
LOG(3) << "initial sharding result : " << result << endl;
return ok;
}
