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Posted to issues@hbase.apache.org by "Nick Dimiduk (Jira)" <ji...@apache.org> on 2020/03/27 17:17:00 UTC
[jira] [Commented] (HBASE-24068) [Flakey Tests]
TestServerSideScanMetricsFromClientSide and NullPointerException
[ https://issues.apache.org/jira/browse/HBASE-24068?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17068915#comment-17068915 ]
Nick Dimiduk commented on HBASE-24068:
--------------------------------------
Partial initialization + inheritance is evil. Would be best to refactor all use of non-{{private}} methods out of the constructors.
> [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
>
> 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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