Jeffrey Zhong created HBASE-8539:
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Summary: Double(or tripple ...) ZooKeeper listeners of the same
type when Master recovers from ZK SessionExpiredException
Key: HBASE-8539
URL: https://issues.apache.org/jira/browse/HBASE-8539
Project: HBase
Issue Type: Bug
Components: master
Affects Versions: 0.95.0, 0.94.7, 0.98.0
Reporter: Jeffrey Zhong
Assignee: Jeffrey Zhong
When Master tries to recover from zookeeper session expired exceptions, we
don't clean old registered listener instances. Therefore, it may end up we have
two(or more) listeners to double handling same events. Attached a screen shot
from debugger to show the issue.
I considered to limit one listener per class while I think that would limit the
listener usage so I choose to clear exiting listeners during recovery for the
fix.
(This issue is unrelated to the issue HBASE-8365 because I verified there is no
dup-listeners when HBASE-8365 happened)
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