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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14032) Reduce fair call queue priority inversion
Date Thu, 09 Feb 2017 16:32:41 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14032?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15859751#comment-15859751
] 

Hudson commented on HADOOP-14032:
---------------------------------

SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #11225 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/11225/])
HADOOP-14032. Reduce fair call queue priority inversion. Contributed by (kihwal: rev a0bfb4150464013a618f30c2e38d88fc6de11ad2)
* (edit) hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ipc/TestFairCallQueue.java
* (edit) hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/FairCallQueue.java


> Reduce fair call queue priority inversion
> -----------------------------------------
>
>                 Key: HADOOP-14032
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14032
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ipc
>    Affects Versions: 2.7.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>             Fix For: 2.8.1, 3.0.0-alpha3
>
>         Attachments: HADOOP-14032.patch
>
>
> The fcq's round robin multiplexer actually rewards abusive users.  Queue consumers scan
for a call from the roving multiplexer index to the lowest prio ring before wrapping around
to the higher prio rings.
> Let's take a fcq with 4 priority rings.  Multiplexer shares per index are 8, 4, 2, 1.
 
> All well behaved clients are operating in ring 0.  Bad client floods the server and drops
to the lowest prio.  Unfortunately the service order gives 8 shares to the good clients, followed
by 4+2+1=7 shares to the bad client.



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