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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10278) Refactor to make CallQueue pluggable
Date Tue, 11 Feb 2014 18:26:23 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10278?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13898102#comment-13898102
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Daryn Sharp commented on HADOOP-10278:
--------------------------------------

bq.  Significant increase in client CPU for 1000ms poll vs trunk (1.2%, p=0.03)
Hmm, why does client cpu increase?  The client is just blocked reading its socket waiting
for a call response.  I could maybe understand a slight client call latency increase from
the -0.2% throughput, but cpu?  

Hiroshi points out a valid race, much like handlers possibly consuming one more call, readers
can insert one more.  Might need to do drainTo until isEmpty, need to think about it.

> Refactor to make CallQueue pluggable
> ------------------------------------
>
>                 Key: HADOOP-10278
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10278
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ipc
>            Reporter: Chris Li
>         Attachments: HADOOP-10278-atomicref.patch, HADOOP-10278-atomicref.patch, HADOOP-10278-atomicref.patch,
HADOOP-10278.patch
>
>
> * Refactor CallQueue into an interface, base, and default implementation that matches
today's behavior
> * Make the call queue impl configurable, keyed on port so that we minimize coupling



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