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https://issues.apache.org/jira/browse/SAMZA-1069?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yi Pan (Data Infrastructure) updated SAMZA-1069:
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Fix Version/s: 0.12.0
> Deadlock between KafkaSystemProducer and KafkaProducer from kafka-clients lib
> -----------------------------------------------------------------------------
>
> Key: SAMZA-1069
> URL: https://issues.apache.org/jira/browse/SAMZA-1069
> Project: Samza
> Issue Type: Bug
> Affects Versions: 0.11.0
> Reporter: Yi Pan (Data Infrastructure)
> Fix For: 0.12.0
>
>
> We have identified one deadlock scenario between the main thread that calls
> KafkaSystemProducer.close() vs the KafkaProducer client lib's network thread
> that calls the callback function within KafkaSystemProducer.send().
> The scenario is the following:
> # SamzaContainer main thread caught an exception from previous commit and
> container initiated shutdown, which calls
> {code}KafkaSystemProducer.stop(){code}, grabbing the synchronized
> {code}producerLock{code} in {code}KafkaSystemProducer{code} and call
> {code}KafkaProducer.flush(){code} to wait for all pending requests to be done.
> # {code}KafkaProducer{code} network I/O thread then calls
> KafkaSystemProducer’s callback function (in {code}RecordBatch.done(){code}),
> which is waiting on the same {code}producerLock{code} in
> {code}KafkaSystemProducer{code} before it can return and call
> {code}producerFuture.done(){code} and release the {code}CountDownLatch{code}
> that the main thread {code}KafkaSystemProducer.close(){code} is waiting on.
> Hence, deadlock!
> We need to make sure the KafkaSystemProducer.close() won't have race
> condition w/ the callbacks triggered by the KafkaProducer's network thread.
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