Janith Kaiprath Valiyalappil created STORM-2720:
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Summary: CLONE - Trident Kafka Spout Emitters do not get full
partition information in getOrderedPartitions()
Key: STORM-2720
URL: https://issues.apache.org/jira/browse/STORM-2720
Project: Apache Storm
Issue Type: Bug
Components: storm-kafka-client, trident
Affects Versions: 1.1.1
Reporter: Janith Kaiprath Valiyalappil
The storm kakfa trident spout uses the KafkaTridentSpoutTopicPartitionRegistry,
to get partition information. The coordinator calls the getTopicPartitions()
method to get partition information and passes it to the emitters. But this
partition information will not be accurate as all instances of
KafkaTridentSpoutTopicPartitionRegistry will not be updated with full partition
information.
The update to the registry is done when the consumer subscribes using
KafkaSpoutConsumerRebalanceListener. This calls the
KafkaTridentSpoutTopicPartitionRegistry.INSTANCE.addAll(partitions); These
calls would only update the registry in that particular worker with partition
information for consumers in that worker.
So when the coordinator calls the getOrderedPartitions() and passes it to each
emitter by calling getOrderedPartitions(), the full partition information will
not be present. The only probable case this would work is if the emitters and
coordinators were on the same worker.
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