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https://issues.apache.org/jira/browse/HBASE-6326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13406200#comment-13406200
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Lars Hofhansl commented on HBASE-6326:
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Patch is against 0.94. 0.96 is quite different.
> Nested retry loops in HConnectionManager
> ----------------------------------------
>
> Key: HBASE-6326
> URL: https://issues.apache.org/jira/browse/HBASE-6326
> Project: HBase
> Issue Type: Bug
> Reporter: Lars Hofhansl
> Priority: Critical
> Fix For: 0.94.1
>
> Attachments: 6326.txt
>
>
> While testing client timeouts when the HBase is not available we found that
> even with aggressive settings, it takes the client 10 minutes or more to
> finally receive an exception.
> Part of this is due to nested nested retry loops in locateRegion.
> locateRegion will first try to locate the table in meta (which is retried),
> then it will try to locate the meta table is root (which is also retried).
> So for each retry of the meta lookup we retry the root lookup as well.
> I have have that avoids locateRegion retrying if it is called from code that
> already has a retry loop.
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