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https://issues.apache.org/jira/browse/HBASE-21292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16917415#comment-16917415
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Hudson commented on HBASE-21292:
--------------------------------
SUCCESS: Integrated in Jenkins build HBase-1.3-IT #631 (See
[https://builds.apache.org/job/HBase-1.3-IT/631/])
HBASE-22706 Backport HBASE-21292 to branch-1 (apurtell: rev
ca5c63486e5d8e1e0e8535ad478bfb896b23d0e4)
* (edit) hbase-server/src/main/java/org/apache/hadoop/hbase/util/IdLock.java
> IdLock.getLockEntry() may hang if interrupted
> ---------------------------------------------
>
> Key: HBASE-21292
> URL: https://issues.apache.org/jira/browse/HBASE-21292
> Project: HBase
> Issue Type: Bug
> Reporter: Allan Yang
> Assignee: Allan Yang
> Priority: Major
> Fix For: 3.0.0, 2.2.0, 2.1.1, 2.0.3
>
> Attachments: HBASE-21292.branch-2.0.001.patch,
> HBASE-21292.branch-2.0.002.patch
>
>
> This is a rare case found by my colleague which really happened on our
> production env.
> Thread may hang(or enter a infinite loop ) when try to call
> IdLock.getLockEntry(). Here is the case:
> 1. Thread1 owned the IdLock, while Thread2(the only one waiting) was waiting
> for it.
> 2. Thread1 called releaseLockEntry, it will set IdLock.locked = false, but
> since Thread2 was waiting, it won't call map.remove(entry.id)
> 3. While Thread1 was calling releaseLockEntry, Thread2 was interrupted. So no
> one will remove this IdLock from the map.
> 4. If another thread try to call getLockEntry on this IdLock， it will end up
> in a infinite loop. Since existing = map.putIfAbsent(entry.id, entry)) !=
> null and existing.locked=false
> It is hard to write a UT since it is a very rare race condition.
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