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

     [ https://issues.apache.org/jira/browse/HADOOP-14032?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kihwal Lee updated HADOOP-14032:
--------------------------------
       Resolution: Fixed
     Hadoop Flags: Reviewed
    Fix Version/s: 3.0.0-alpha3
                   2.8.1
           Status: Resolved  (was: Patch Available)

Committed to from trunk to branch-2.8. Thanks for the patch, Daryn.

> 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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