Packages

class ShardCoordinator extends AnyRef

A rudimentary shard/partition coordinator. Provides ShardPermits by lowest available ID first (linear scan).

val shardCoordinator = new ShardCoordinator(zkClient, "/testing/twitter/service/something/shards", numShards)
log.trace("Waiting for shard permit...")
shardCoordinator.acquire flatMap { shard =>
  log.trace("Working as shard %d", shard.id)
  { // inside some Future
    if (Hashing.consistentHash(item, numShards) == shard.id) action
  } ensure { shard.release }
}
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Instance Constructors

  1. new ShardCoordinator(zk: ZkClient, path: String, numShards: Int)

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  1. final def !=(arg0: Any): Boolean
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  2. final def ##(): Int
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  3. final def ==(arg0: Any): Boolean
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  4. def acquire(): Future[ShardPermit]

    Acquire a permit for a shard (ShardPermit) asynchronously.

    Acquire a permit for a shard (ShardPermit) asynchronously. A ShardPermit contains a zero-indexed shard ID. Be sure to call release() on the ShardPermit when your client is finished performing work for the shard.

    returns

    A Future of ShardPermit that is satisfied when a shard slot becomes available.

    Exceptions thrown

    RejectedExecutionException when a shard cannot be acquired due to an unexpected state in the zookeeper tree. Assumed to only happen if some zookeeper client clobbers the tree location for this ShardCoordinator.

    SemaphoreError when the underlying semaphore throws an exception.

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