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https://issues.apache.org/jira/browse/HBASE-18902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16185180#comment-16185180
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Appy commented on HBASE-18902:
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The reason was very general - test the 3 CP services envs in isolation.
Say Master service compat is broken and Master fails to come up, that'd have
affected other two tests.
> TestCoprocessorServiceBackwardCompatibility fails in master branch
> ------------------------------------------------------------------
>
> Key: HBASE-18902
> URL: https://issues.apache.org/jira/browse/HBASE-18902
> Project: HBase
> Issue Type: Test
> Reporter: Ted Yu
> Assignee: Ted Yu
> Attachments: 18902.v1.txt, 18902.v2.txt, 18902.v3.txt,
> HBASE-18902.master.001.patch, HBASE-18902.master.001.patch
>
>
> Starting mini cluster in subtests without shutting down resulted in:
> {code}
> java.lang.IllegalStateException: A mini-cluster is already running
> at
> org.apache.hadoop.hbase.coprocessor.TestCoprocessorServiceBackwardCompatibility.testCoprocessorServiceLoadedByRegion(TestCoprocessorServiceBackwardCompatibility.java:109)
> {code}
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