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https://issues.apache.org/jira/browse/HBASE-17114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15674690#comment-15674690
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Gary Helmling commented on HBASE-17114:
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bq. AFAICS we're already doing this in
ClientExceptionsUtil#isMetaClearingException and treated
CQTBE/RegionTooBusyException etc. as special exceptions:
It's only special in the sense that it should not clear the client meta cache.
I don't think that implies it should use a different retry pause.
bq. Agree this is another good way to handle this, but by default we are still
using NoBackoffPolicy right?
No, a number of places use ConnectionUtils.getPauseTime() which uses an
exponential backoff. Maybe this has changed in master with consolidating use
of AsyncProcess, but that would be an unexpected change in behavior.
I'm -1 on using a special unique pause time for CQTBE by default. I think it
should use the configured pause time by default. If you want to make this
overridable for some exception types, that seems ok, but in that case the
config property for overriding the value should be more closely tied to the
exception. As a user of HBase, there's no way I would know what
"hbase.client.pause.special" means and why it is different.
> Add an option to set special retry pause when encountering
> CallQueueTooBigException
> -----------------------------------------------------------------------------------
>
> Key: HBASE-17114
> URL: https://issues.apache.org/jira/browse/HBASE-17114
> Project: HBase
> Issue Type: Bug
> Reporter: Yu Li
> Assignee: Yu Li
> Attachments: HBASE-17114.patch
>
>
> As titled, after HBASE-15146 we will throw {{CallQueueTooBigException}}
> instead of dead-wait. This is good for performance for most cases but might
> cause a side-effect that if too many clients connect to the busy RS, that the
> retry requests may come over and over again and RS never got the chance for
> recovering, and the issue will become especially critical when the target
> region is META.
> So here in this JIRA we propose to supply some special retry pause for CQTBE
> in name of {{hbase.client.pause.special}}, and by default it will be 500ms (5
> times of {{hbase.client.pause}} default value)
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