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)

Value Members

  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.

    Note

    Throws SemaphoreError when the underlying semaphore throws an exception.

    ,

    Throws 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.

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  6. def clone(): AnyRef
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