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https://issues.apache.org/jira/browse/HBASE-20169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16416449#comment-16416449
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stack commented on HBASE-20169:
-------------------------------
More rare than before but can still happen. It is not in current list of
flakies. Moving out of 2.0.0 since non-critical.
> NPE when calling HBTU.shutdownMiniCluster (TestAssignmentManagerMetrics is
> flakey)
> ----------------------------------------------------------------------------------
>
> Key: HBASE-20169
> URL: https://issues.apache.org/jira/browse/HBASE-20169
> Project: HBase
> Issue Type: Bug
> Components: test
> Reporter: Duo Zhang
> Assignee: stack
> Priority: Critical
> Attachments: HBASE-20169.branch-2.001.patch,
> HBASE-20169.branch-2.002.patch, HBASE-20169.branch-2.003.patch,
> HBASE-20169.branch-2.004.patch, HBASE-20169.branch-2.005.patch
>
>
> This usually happens when some master or rs has already been down before we
> calling shutdownMiniCluster.
> See
> https://builds.apache.org/job/HBASE-Flaky-Tests/27223/testReport/junit/org.apache.hadoop.hbase.master/TestAssignmentManagerMetrics/org_apache_hadoop_hbase_master_TestAssignmentManagerMetrics/
> and also
> http://104.198.223.121:8080/job/HBASE-Flaky-Tests/34873/testReport/junit/org.apache.hadoop.hbase.master/TestRestartCluster/testRetainAssignmentOnRestart/
> {noformat}
> java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.master.TestAssignmentManagerMetrics.after(TestAssignmentManagerMetrics.java:100)
> java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.master.TestRestartCluster.testRetainAssignmentOnRestart(TestRestartCluster.java:156)
> {noformat}
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