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https://issues.apache.org/jira/browse/HBASE-27381?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17608254#comment-17608254
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Bryan Beaudreault commented on HBASE-27381:
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Removing RegionInfo.UNDEFINED has eliminated the deadlocks we were seeing. This
is probably no surprise.
The initial approach taken in HBASE-24896 was to deprecate it for removal in
4.0.0, which honestly seems forever away just given how long we've been waiting
to release 3.0. Given the potential severity of this bug, I wonder if it's
worth pushing an incompatible change to remove. I'm not sure there's a huge
value in this constant for downstream users?
> Still seeing 'Stuck' in static initialization creating RegionInfo instance
> --------------------------------------------------------------------------
>
> Key: HBASE-27381
> URL: https://issues.apache.org/jira/browse/HBASE-27381
> Project: HBase
> Issue Type: Bug
> Reporter: Bryan Beaudreault
> Priority: Major
>
> See https://issues.apache.org/jira/browse/HBASE-24896 for the original
> description. Despite having that fix, we are seeing this issue in a
> 2.4.6-based deploy. We recently started seeing it as we were moving to
> centos8. I'm not sure why the centos version would affect this, otherwise the
> hbase server version and java versions were not changing.
> We're seeing this in a non-trivial number of new centos8 servers that we spin
> up. I'm pushing a hotfix which removes RegionInfo.UNDEFINED to see if that
> resolves our issue.
> As mentioned in my last comments on that jira, it could be that this field is
> still an issue because according to
> [https://stackoverflow.com/questions/28631656/runnable-thread-state-but-in-object-wait:]
> > Such deadlocks may be caused by a [typical
> > bug|https://bugs.openjdk.org/browse/JDK-8037567] when a subclass is
> > referenced from a static initializer.
> If that's true, in this case MutableRegionInfo is a subclass/implementer of
> RegionInfo, so that could trigger it. Granted the linked bug is marked "Not
> An Issue".
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