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Posted to dev@hbase.apache.org by "Michael Stack (Jira)" <ji...@apache.org> on 2020/04/01 05:34:00 UTC
[jira] [Resolved] (HBASE-24068) [Flakey Tests]
TestServerSideScanMetricsFromClientSide and NullPointerException
[ https://issues.apache.org/jira/browse/HBASE-24068?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Michael Stack resolved HBASE-24068.
-----------------------------------
Fix Version/s: 2.3.0
3.0.0
Hadoop Flags: Reviewed
Resolution: Implemented
Resolving as implemented by HBASE-24079.
Thanks for reviews of PR [~ndimiduk] and [~janh]
> [Flakey Tests] TestServerSideScanMetricsFromClientSide and NullPointerException
> -------------------------------------------------------------------------------
>
> Key: HBASE-24068
> URL: https://issues.apache.org/jira/browse/HBASE-24068
> Project: HBase
> Issue Type: Bug
> Components: flakies
> Reporter: Michael Stack
> Priority: Major
> Fix For: 3.0.0, 2.3.0
>
>
> This fails for me locally sporadically.
> {code}
> -------------------------------------------------------------------------------
> Test set: org.apache.hadoop.hbase.TestServerSideScanMetricsFromClientSide
> -------------------------------------------------------------------------------
> Tests run: 3, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 2.893 s <<< FAILURE! - in org.apache.hadoop.hbase.TestServerSideScanMetricsFromClientSide
> org.apache.hadoop.hbase.TestServerSideScanMetricsFromClientSide.testRowsSeenMetricWithAsync Time elapsed: 0.325 s <<< ERROR!
> java.lang.NullPointerException
> {code}
> Log pinpoints the problem a little better
> {code}
> Exception in thread "testTable.asyncPrefetcher" java.lang.NullPointerException
> at org.apache.hadoop.hbase.client.ClientAsyncPrefetchScanner$PrefetchRunnable.run(ClientAsyncPrefetchScanner.java:183)
> at java.lang.Thread.run(Thread.java:748)
> java.lang.NullPointerException
> at org.apache.hadoop.hbase.client.ClientAsyncPrefetchScanner$PrefetchRunnable.run(ClientAsyncPrefetchScanner.java:174)
> at java.lang.Thread.run(Thread.java:748)
> java.lang.NullPointerException
> at org.apache.hadoop.hbase.client.ClientAsyncPrefetchScanner$PrefetchRunnable.run(ClientAsyncPrefetchScanner.java:174)
> at java.lang.Thread.run(Thread.java:748)
> 2020-03-26 22:18:15,160 ERROR [Listener at localhost/53268] hbase.TestServerSideScanMetricsFromClientSide(202): FAIL
> java.lang.NullPointerException
> at org.apache.hadoop.hbase.client.ClientAsyncPrefetchScanner$PrefetchRunnable.run(ClientAsyncPrefetchScanner.java:174)
> at java.lang.Thread.run(Thread.java:748)
> {code}
> It didn't make sense to me since complaint was about a 'lock' that is created as a final data member. But then this issue happened for my compaƱero, [~ndimiduk]... and he saw that the call is from a Thread inner class in this class's grandparent that is set running on construction; i.e. the lock *could* be null at the time of reference.
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