ChunkManagerPtr DBConfig::getChunkManager( const string& ns , bool reload ){
scoped_lock lk( _lock );
ChunkManagerPtr m = _shards[ns];
if ( m && ! reload )
return m;
uassert( 10181 , (string)"not sharded:" + ns , _isSharded( ns ) );
if ( m && reload )
log() << "reloading shard info for: " << ns << endl;
m.reset( new ChunkManager( this , ns , _sharded[ ns ].key , _sharded[ns].unique ) );
_shards[ns] = m;
return m;
}
ChunkManagerPtr DBConfig::shardCollection( const string& ns , ShardKeyPattern fieldsAndOrder , bool unique ){
if ( ! _shardingEnabled )
throw UserException( 8042 , "db doesn't have sharding enabled" );
scoped_lock lk( _lock );
ChunkManagerPtr info = _shards[ns];
if ( info )
return info;
if ( _isSharded( ns ) )
throw UserException( 8043 , "already sharded" );
log() << "enable sharding on: " << ns << " with shard key: " << fieldsAndOrder << endl;
_sharded[ns] = CollectionInfo( fieldsAndOrder , unique );
info.reset( new ChunkManager( this , ns , fieldsAndOrder , unique ) );
_shards[ns] = info;
return info;
}
