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https://issues.apache.org/jira/browse/HBASE-20169?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chia-Ping Tsai updated HBASE-20169:
-----------------------------------
    Attachment: HBASE-20169.v0.addendum.patch

> 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: Major
>         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, 
> HBASE-20169.v0.addendum.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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