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From "Jimmy Xiang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-9184) Ignore zk assign event if region is not known in transition
Date Fri, 09 Aug 2013 23:16:48 GMT
Jimmy Xiang created HBASE-9184:
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             Summary: Ignore zk assign event if region is not known in transition
                 Key: HBASE-9184
                 URL: https://issues.apache.org/jira/browse/HBASE-9184
             Project: HBase
          Issue Type: Bug
          Components: Region Assignment
            Reporter: Jimmy Xiang
            Assignee: Jimmy Xiang


This is a follow up of HBASE-9161.  Currently, if a region is in transition, we ignore any
unexpected zk assign event and log a warning. For example, a zk closing event will be ignored
if the region is pending open actually.  However, if the region is not in transition, we will
accept such events.  For events not related to split/merge, we should ignore them and log
a warning too, to tighten up the region state transition.  During normal operation, this (ensuring
region is in transition before accepting transition related events) is fine.  During master
failover, this is fine as long as we don't do region transition bypass ZK.  We should also
make sure to watch assignment znodes after user region states are recovered, so that we don't
log many such warnings.

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