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https://issues.apache.org/jira/browse/HIVE-27733?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17769153#comment-17769153
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Henri Biestro commented on HIVE-27733:
--------------------------------------
Indeed, it is. But the code still encounters the race condition due to sharing
the PerfLogger between threads.
> Intermittent ConcurrentModificationException in HiveServer2
> -----------------------------------------------------------
>
> Key: HIVE-27733
> URL: https://issues.apache.org/jira/browse/HIVE-27733
> Project: Hive
> Issue Type: Bug
> Components: HiveServer2
> Affects Versions: 4.0.0-beta-1
> Reporter: Henri Biestro
> Assignee: Henri Biestro
> Priority: Major
>
> Some tests sporadically fail with a cause that looks like:
> {code}
> Caused by: java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextNode(HashMap.java:1493) ~[?:?]
> at java.util.HashMap$EntryIterator.next(HashMap.java:1526) ~[?:?]
> at java.util.HashMap$EntryIterator.next(HashMap.java:1524) ~[?:?]
> at java.util.AbstractCollection.toArray(AbstractCollection.java:200)
> ~[?:?]
> at com.google.common.collect.Iterables.toArray(Iterables.java:285)
> ~[hive-exec-3.1.3000.7.1.8.0-774.jar:3.1.3000.7.1.8.0-774]
> at com.google.common.collect.ImmutableMap.copyOf(ImmutableMap.java:451)
> ~[hive-exec-3.1.3000.7.1.8.0-774.jar:3.1.3000.7.1.8.0-774]
> at com.google.common.collect.ImmutableMap.copyOf(ImmutableMap.java:436)
> ~[hive-exec-3.1.3000.7.1.8.0-774.jar:3.1.3000.7.1.8.0-774]
> at
> org.apache.hadoop.hive.ql.log.PerfLogger.getEndTimes(PerfLogger.java:227)
> ~[hive-exec-3.1.3000.7.1.8.0-774.jar:3.1.3000.7.1.8.0-774]
> at org.apache.hadoop.hive.ql.Driver.compileInternal(Driver.java:629)
> ~[hive-exec-3.1.3000.7.1.8.0-774.jar:3.1.3000.7.1.8.0-774]
> at org.apache.hadoop.hive.ql.Driver.compileAndRespond(Driver.java:560)
> ~[hive-exec-3.1.3000.7.1.8.0-774.jar:3.1.3000.7.1.8.0-774]
> at org.apache.hadoop.hive.ql.Driver.compileAndRespond(Driver.java:554)
> ~[hive-exec-3.1.3000.7.1.8.0-774.jar:3.1.3000.7.1.8.0-774]
> at
> org.apache.hadoop.hive.ql.reexec.ReExecDriver.compileAndRespond(ReExecDriver.java:127)
> ~[hive-exec-3.1.3000.7.1.8.0-774.jar:3.1.3000.7.1.8.0-774]
> at
> org.apache.hive.service.cli.operation.SQLOperation.prepare(SQLOperation.java:200)
> ~[hive-service-3.1.3000.7.1.8.0-774.jar:3.1.3000.7.1.8.0-774]
> ... 51 more
> {code}
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