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https://issues.apache.org/jira/browse/HBASE-4492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13115798#comment-13115798
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Ming Ma commented on HBASE-4492:
--------------------------------
Here are the sequence of events how this could happen. It applies to any region.
T1. After AM sent openRegion RPC to RS1, RS1 set ZK state as OPENING.
T2. RS1 is stopped.
T3. ZK callbacked is delayed with ZK state OPENING. AM skip the processing
given RS1 is offline. Thus region's state in AM is still PENDING_OPEN.
T4. During RS1's ServerShutDownHandler, it tries to assign the region by
setting it offline first. This isn't allowed given the state isn't CLOSING or
CLOSED.
> TestRollingRestart fails intermittently
> ---------------------------------------
>
> Key: HBASE-4492
> URL: https://issues.apache.org/jira/browse/HBASE-4492
> Project: HBase
> Issue Type: Test
> Reporter: Ted Yu
> Assignee: Jonathan Gray
> Attachments: 4492.txt
>
>
> I got the following when running test suite on TRUNK:
> {code}
> testBasicRollingRestart(org.apache.hadoop.hbase.master.TestRollingRestart)
> Time elapsed: 300.28 sec <<< ERROR!
> java.lang.Exception: test timed out after 300000 milliseconds
> at java.lang.Thread.sleep(Native Method)
> at
> org.apache.hadoop.hbase.master.TestRollingRestart.waitForRSShutdownToStartAndFinish(TestRollingRestart.java:313)
> at
> org.apache.hadoop.hbase.master.TestRollingRestart.testBasicRollingRestart(TestRollingRestart.java:210)
> {code}
> I ran TestRollingRestart#testBasicRollingRestart manually afterwards which
> wiped out test output file for the failed test.
> Similar failure can be found on Jenkins:
> https://builds.apache.org/view/G-L/view/HBase/job/HBase-0.92/19/testReport/junit/org.apache.hadoop.hbase.master/TestRollingRestart/testBasicRollingRestart/
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