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https://issues.apache.org/jira/browse/HBASE-27648?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bryan Beaudreault updated HBASE-27648:
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Fix Version/s: 2.6.0
> CopyOnWriteArrayMap does not honor contract of ConcurrentMap.putIfAbsent
> ------------------------------------------------------------------------
>
> Key: HBASE-27648
> URL: https://issues.apache.org/jira/browse/HBASE-27648
> Project: HBase
> Issue Type: Bug
> Reporter: Bryan Beaudreault
> Assignee: Bryan Beaudreault
> Priority: Major
> Labels: patch-available
> Fix For: 2.6.0, 3.0.0-alpha-4, 2.4.17, 2.5.4
>
>
> I've been tracking down a meta cache issue and noticed this. I'm not sure if
> this is actually causing an issue, but if you enable TRACE logs on MetaCache
> it causes all calls to cacheLocation to go down the "Merged cached locations"
> path instead of the "Cached location" path for inserting new entries. This is
> just misleading, but also means going through the more expensive
> RegionLocations.mergeLocations. Reading the code, I don't think that would
> cause an actual issue, but hard to be sure.
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