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https://issues.apache.org/jira/browse/HBASE-24068?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nick Dimiduk reopened HBASE-24068:
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Looks like this one was never committed boss.
> [Flakey Tests] TestServerSideScanMetricsFromClientSide and
> NullPointerException
> -------------------------------------------------------------------------------
>
> Key: HBASE-24068
> URL: https://issues.apache.org/jira/browse/HBASE-24068
> Project: HBase
> Issue Type: Test
> Components: flakies
> Reporter: Michael Stack
> Assignee: 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 compañero,
> [~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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