Xu Mingmin created STORM-2340:
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Summary: KafkaSpout is blocked in AutoCommitMode
Key: STORM-2340
URL: https://issues.apache.org/jira/browse/STORM-2340
Project: Apache Storm
Issue Type: Improvement
Components: storm-kafka-client
Reporter: Xu Mingmin
What's the issue?
When Storm topology is run on 'At-Most-Once' mode, with ack executor=0,
KafkaSpout cannot emit records after some time.
What's the cause?
Function poll() controls whether it need to pull more data from Kafka cluster.
With the condition !waitingToEmit() && numUncommittedOffsets <
maxUncommittedOffsets, it's always FALSE after reaching threshold, as
numUncommittedOffsets is creasing and never reset on 'At-Most-Once' mode.
What's the solution?
I change the condition to !waitingToEmit() && (numUncommittedOffsets <
maxUncommittedOffsets || consumerAutoCommitMode), that return TRUE with
AutoCommitMode regarding of UnCommittedOffset, see the comments inline.
Also, it's not required to track emitted(msgId) and numUncommittedOffsets with
AutoCommitMode .
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