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From "Rajini Sivaram (JIRA)" <j...@apache.org>
Subject [jira] [Created] (KAFKA-6710) Streams integration tests hang during shutdown
Date Sat, 24 Mar 2018 15:29:00 GMT
Rajini Sivaram created KAFKA-6710:

             Summary: Streams integration tests hang during shutdown
                 Key: KAFKA-6710
                 URL: https://issues.apache.org/jira/browse/KAFKA-6710
             Project: Kafka
          Issue Type: Bug
          Components: core, streams
    Affects Versions: 1.1.0
            Reporter: Rajini Sivaram
            Assignee: Rajini Sivaram

Builds have been timing out a lot recently and many of the logs show streams integration tests
being run, but not completed. While running tests locally, I saw a failure during shutdown
of {{TableTableJoinIntegrationTest}}. The test was stuck waiting for a broker to shutdown
when a {{KafkaScheduler}} was attemping to delete logs. KAFKA-6624 (Commit #1ea07b993d75ed68f4c04282eb177bf84156e0b2)
added a _Thread.sleep_ to wait for the time to delete each log segment inside the scheduled
delete task. The failing streams test had 62 logs to delete and since MockTime doesn't get
updated during the test, it would have waited for 62 minutes to complete. This blocks shutdown
of the broker for 62 minutes. This is an issue if a streams integration test takes more than
30 seconds when the first delayed delete task is scheduled to be run.

Changing _Thread.sleep_ to _time.sleep_ fixes this test issue. But it will be good to know
why we have a _sleep_ on a _Scheduler_ at all. With the default _log.segment.delete.delay.ms_
of one minute, this potentially blocks a scheduler thread for upto a minute when there are
logs to be deleted. Couldn't we just break out of the loop if it is not yet time to delete
the first log segment in the list? The log would then get deleted when the broker checks next
time. [~junrao] [~lindong] ?


*Stack trace from failing test*:

{{"kafka-scheduler-8" daemon prio=5 tid=0x00007fe58dc16800 nid=0x9603 waiting on condition
{{   java.lang.Thread.State: TIMED_WAITING (sleeping)}}
{{        at java.lang.Thread.sleep(Native Method)}}
{{        at kafka.log.LogManager.kafka$log$LogManager$$deleteLogs(LogManager.scala:717)}}
{{        at kafka.log.LogManager$$anonfun$3.apply$mcV$sp(LogManager.scala:406)}}
{{        at kafka.utils.KafkaScheduler$$anonfun$1.apply$mcV$sp(KafkaScheduler.scala:110)}}
{{        at kafka.utils.CoreUtils$$anon$1.run(CoreUtils.scala:62)}}
{{        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)}}
{{        at java.util.concurrent.FutureTask.run(FutureTask.java:262)}}
{{        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178)}}
{{        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292)}}
{{        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)}}
{{        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)}}
{{        at java.lang.Thread.run(Thread.java:745)}}{{}}

{{}}{{"Test worker" prio=5 tid=0x00007fe58db72000 nid=0x5203 waiting on condition [0x0000700001cbd000]}}
{{   java.lang.Thread.State: TIMED_WAITING (parking)}}
{{        at sun.misc.Unsafe.park(Native Method)}}
{{        - parking to wait for  <0x0000000780fb8918> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)}}
{{        at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:226)}}
{{        at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2082)}}
{{        at java.util.concurrent.ThreadPoolExecutor.awaitTermination(ThreadPoolExecutor.java:1468)}}
{{        at kafka.utils.KafkaScheduler.shutdown(KafkaScheduler.scala:98)}}
{{        at kafka.server.KafkaServer$$anonfun$shutdown$5.apply$mcV$sp(KafkaServer.scala:569)}}
{{        at kafka.utils.CoreUtils$.swallow(CoreUtils.scala:85)}}
{{        at kafka.server.KafkaServer.shutdown(KafkaServer.scala:569)}}
{{        at org.apache.kafka.streams.integration.utils.KafkaEmbedded.stop(KafkaEmbedded.java:129)}}
{{        at org.apache.kafka.streams.integration.utils.EmbeddedKafkaCluster.stop(EmbeddedKafkaCluster.java:126)}}
{{        at org.apache.kafka.streams.integration.utils.EmbeddedKafkaCluster.after(EmbeddedKafkaCluster.java:158)}}
{{        at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:50)}}
{{        at org.junit.rules.RunRules.evaluate(RunRules.java:20)}}

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