Package org.apache.storm.trident.spout
Interface ITridentSpout<T>
- All Superinterfaces:
ITridentDataSource
,Serializable
- All Known Subinterfaces:
ICommitterTridentSpout<X>
- All Known Implementing Classes:
BatchSpoutExecutor
,FeederBatchSpout
,FeederCommitterBatchSpout
,OpaquePartitionedTridentSpoutExecutor
,PartitionedTridentSpoutExecutor
,RichSpoutBatchExecutor
,TridentJmsSpout
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Nested Class Summary
Modifier and TypeInterfaceDescriptionstatic interface
static interface
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Method Summary
Modifier and TypeMethodDescriptiongetCoordinator
(String txStateId, Map<String, Object> conf, TopologyContext context) The coordinator for a TransactionalSpout runs in a single thread and indicates when batches of tuples should be emitted.getEmitter
(String txStateId, Map<String, Object> conf, TopologyContext context) The emitter for a TransactionalSpout runs as many tasks across the cluster.
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Method Details
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getCoordinator
ITridentSpout.BatchCoordinator<T> getCoordinator(String txStateId, Map<String, Object> conf, TopologyContext context) The coordinator for a TransactionalSpout runs in a single thread and indicates when batches of tuples should be emitted. The Coordinator that you provide in a TransactionalSpout provides metadata for each transaction so that the transactions can be replayed in case of failure.Two instances are requested, one on the master batch coordinator where isReady() is called, and an instance in the coordinator bolt which is used for all other operations. The two instances do not necessarily share a worker JVM.
- Parameters:
txStateId
- stream idconf
- Storm config mapcontext
- topology context- Returns:
- spout coordinator instance
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getEmitter
ITridentSpout.Emitter<T> getEmitter(String txStateId, Map<String, Object> conf, TopologyContext context) The emitter for a TransactionalSpout runs as many tasks across the cluster. Emitters are responsible for emitting batches of tuples for a transaction and must ensure that the same batch of tuples is always emitted for the same transaction id.All emitter tasks get the same transaction metadata. The topology context parameter contains the instance task id that can be used to distribute the work across the tasks.
- Parameters:
txStateId
- stream idconf
- Storm config mapcontext
- topology context- Returns:
- spout emitter
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getComponentConfiguration
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getOutputFields
Fields getOutputFields()
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