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https://issues.apache.org/jira/browse/HBASE-21292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16656182#comment-16656182
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Hudson commented on HBASE-21292:
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Results for branch branch-2.0
[build #971 on
builds.a.o|https://builds.apache.org/job/HBase%20Nightly/job/branch-2.0/971/]:
(x) *{color:red}-1 overall{color}*
----
details (if available):
(/) {color:green}+1 general checks{color}
-- For more information [see general
report|https://builds.apache.org/job/HBase%20Nightly/job/branch-2.0/971//General_Nightly_Build_Report/]
(x) {color:red}-1 jdk8 hadoop2 checks{color}
-- For more information [see jdk8 (hadoop2)
report|https://builds.apache.org/job/HBase%20Nightly/job/branch-2.0/971//JDK8_Nightly_Build_Report_(Hadoop2)/]
(x) {color:red}-1 jdk8 hadoop3 checks{color}
-- For more information [see jdk8 (hadoop3)
report|https://builds.apache.org/job/HBase%20Nightly/job/branch-2.0/971//JDK8_Nightly_Build_Report_(Hadoop3)/]
(/) {color:green}+1 source release artifact{color}
-- See build output for details.
> 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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