question: public long unblockRequestOnShard ( String shardId ) { CountDownLatch lock = shardLocks . remove ( shardId ) ; if ( lock != null ) { long count = lock . getCount ( ) ; lock . countDown ( ) ; trace ( "[{}] Request unblocked on shardId={}" , gondola . getHostId ( ) , shardId ) ; return count ; } return 0 ; }
target:  Unblock request on shard long.