Tests that use RegionServer.openRegion such as TestHBaseFsck#testHBaseFsck
should call openRegion synchronously
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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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