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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10279) Create multiplexer, a requirement for the fair queue
Date Fri, 20 Jun 2014 05:34:25 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14038480#comment-14038480
] 

Hadoop QA commented on HADOOP-10279:
------------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12651270/HADOOP-10279.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-common-project/hadoop-common.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/4122//testReport/
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/4122//console

This message is automatically generated.

> Create multiplexer, a requirement for the fair queue
> ----------------------------------------------------
>
>                 Key: HADOOP-10279
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10279
>             Project: Hadoop Common
>          Issue Type: Sub-task
>            Reporter: Chris Li
>            Assignee: Chris Li
>         Attachments: HADOOP-10279.patch, HADOOP-10279.patch, WeightedRoundRobinMultiplexer.java,
subtask2_add_mux.patch
>
>
> The Multiplexer helps the FairCallQueue decide which of its internal sub-queues to read
from during a poll() or take(). It controls the penalty of being in a lower queue. Without
the mux, the FairCallQueue would have issues with starvation of low-priority requests.
> The WeightedRoundRobinMultiplexer is an implementation which uses a weighted round robin
approach to muxing the sub-queues. It is configured with an integer list pattern.
> For example: 10, 5, 5, 2 means:
> * Read queue 0 10 times
> * Read queue 1 5 times
> * Read queue 2 5 times
> * Read queue 3 2 times
> * Repeat



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