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https://issues.apache.org/jira/browse/HBASE-15146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15348432#comment-15348432
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Sean Busbey commented on HBASE-15146:
-------------------------------------
[~ikeda] please have this discussion either on dev@hbase or in a new JIRA. this
one has been resolved for ~6 months, so it isn't likely to get a continued
audience.
> Don't block on Reader threads queueing to a scheduler queue
> -----------------------------------------------------------
>
> Key: HBASE-15146
> URL: https://issues.apache.org/jira/browse/HBASE-15146
> Project: HBase
> Issue Type: Bug
> Affects Versions: 1.2.0
> Reporter: Elliott Clark
> Assignee: Elliott Clark
> Priority: Blocker
> Fix For: 2.0.0, 1.2.0, 1.3.0
>
> Attachments: HBASE-15146-v7.patch, HBASE-15146-v8.patch,
> HBASE-15146-v8.patch, HBASE-15146.0.patch, HBASE-15146.1.patch,
> HBASE-15146.2.patch, HBASE-15146.3.patch, HBASE-15146.4.patch,
> HBASE-15146.5.patch, HBASE-15146.6.patch
>
>
> Blocking on the epoll thread is awful. The new rpc scheduler can have lots of
> different queues. Those queues have different capacity limits. Currently the
> dispatch method can block trying to add the the blocking queue in any of the
> schedulers.
> This causes readers to block, tcp acks are delayed, and everything slows down.
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