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https://issues.apache.org/jira/browse/HIVE-15936?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniel Dai updated HIVE-15936:
------------------------------
Status: Patch Available (was: Open)
> ConcurrentModificationException in ATSHook
> ------------------------------------------
>
> Key: HIVE-15936
> URL: https://issues.apache.org/jira/browse/HIVE-15936
> Project: Hive
> Issue Type: Bug
> Reporter: Daniel Dai
> Assignee: Daniel Dai
> Attachments: HIVE-15936.1.patch
>
>
> See ATSHook error:
> {noformat}
> java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextNode(HashMap.java:1437)
> ~[?:1.8.0_112]
> at java.util.HashMap$EntryIterator.next(HashMap.java:1471)
> ~[?:1.8.0_112]
> at java.util.HashMap$EntryIterator.next(HashMap.java:1469)
> ~[?:1.8.0_112]
> at java.util.AbstractCollection.toArray(AbstractCollection.java:196)
> ~[?:1.8.0_112]
> at com.google.common.collect.ImmutableMap.copyOf(ImmutableMap.java:290)
> ~[guava-14.0.1.jar:?]
> at
> org.apache.hadoop.hive.ql.log.PerfLogger.getEndTimes(PerfLogger.java:219)
> ~[hive-common-2.1.0.2.6.0.0-457.jar:2.1.0.2.6.0.0-457]
> at
> org.apache.hadoop.hive.ql.hooks.ATSHook.createPostHookEvent(ATSHook.java:347)
> ~[hive-exec-2.1.0.2.6.0.0-457.jar:2.1.0.2.6.0.0-457]
> at org.apache.hadoop.hive.ql.hooks.ATSHook$2.run(ATSHook.java:206)
> [hive-exec-2.1.0.2.6.0.0-457.jar:2.1.0.2.6.0.0-457]
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> [?:1.8.0_112]
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> [?:1.8.0_112]
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> [?:1.8.0_112]
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> [?:1.8.0_112]
> at java.lang.Thread.run(Thread.java:745) [?:1.8.0_112]
> {noformat}
> According to [~jdere], ATSHook is currently accessing the PerfLogger on a
> separate thread, which means the main query thread can potentially write to
> the PerfLogger at the same time.
> The ATSHook should access the PerfLogger on the main query thread, before it
> sends the execution to the ATS Logger thread.
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