bool run(const string& , BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool) {
ShardConnection::sync();
string ns = cmdObj.firstElement().valuestrsafe();
if ( ns.size() == 0 ) {
errmsg = "no ns";
return false;
}
DBConfigPtr config = grid.getDBConfig( ns );
if ( ! config->isSharded( ns ) ) {
errmsg = "ns not sharded. have to shard before can split";
return false;
}
BSONObj find = cmdObj.getObjectField( "find" );
if ( find.isEmpty() ) {
find = cmdObj.getObjectField( "middle" );
if ( find.isEmpty() ) {
errmsg = "need to specify find or middle";
return false;
}
}
ChunkManagerPtr info = config->getChunkManager( ns );
ChunkPtr chunk = info->findChunk( find );
BSONObj middle = cmdObj.getObjectField( "middle" );
assert( chunk.get() );
log() << "splitting: " << ns << " shard: " << chunk << endl;
BSONObj res;
ChunkPtr p;
if ( middle.isEmpty() ) {
p = chunk->singleSplit( true /* force a split even if not enough data */ , res );
}
else {
// sanity check if the key provided is a valid split point
if ( ( middle == chunk->getMin() ) || ( middle == chunk->getMax() ) ) {
errmsg = "cannot split on initial or final chunk's key";
return false;
}
vector<BSONObj> splitPoints;
splitPoints.push_back( middle );
p = chunk->multiSplit( splitPoints , res );
}
if ( p.get() == NULL ) {
errmsg = "split failed";
result.append( "cause" , res );
return false;
}
return true;
}
virtual bool _split( BSONObjBuilder& result , string& errmsg , const string& ns , ChunkManagerPtr manager , ChunkPtr old , BSONObj middle ){
assert( old.get() );
log() << "splitting: " << ns << " shard: " << old << endl;
if ( middle.isEmpty() )
old->split();
else {
vector<BSONObj> splitPoints;
splitPoints.push_back( middle );
old->multiSplit( splitPoints );
}
return true;
}
