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https://issues.apache.org/jira/browse/HBASE-4852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13446124#comment-13446124
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Jesse Yates commented on HBASE-4852:
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Thanks for the clarification Jon.
> Tests that use RegionServer.openRegion such as TestHBaseFsck#testHBaseFsck
> should call openRegion synchronously
> ---------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-4852
> URL: https://issues.apache.org/jira/browse/HBASE-4852
> Project: HBase
> Issue Type: Bug
> Components: regionserver
> Affects Versions: 0.92.0, 0.94.0
> Reporter: Jonathan Hsieh
>
> Certain test cases like HBaseFsck#testHBaseFsck make calls to assign region
> servers and then read meta. The tests or hbck should be modified to make the
> RegionServer.openRegion call act synchronously.
> The main issue isn't what is returned, but when. Specifically in
> HBaseFsck#testHBaseFsck, the first 'hbck -fix', the master makes a call to
> the regionserver to issue an asynchronous request to open the region (which
> adds data to meta). The regionserver returns right away. The next hbck call
> will cause the master query meta again which is used to check consistency. A
> race is exposed -- sometimes the new meta entries are fixed before the second
> hbck call is done (failing the test), sometimes it is not (not failing).
> The hack in HBASE-4842 introduces a slight delay which usually allows the
> open request to finish and the meta entry to be updated before the subsequent
> 'hbck' call.
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