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Date: Fri, 10 Jun 2016 23:38:21 +0000 (UTC)
From: "Ming Ma (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Message-ID: <JIRA.12971677.1463781276000.59350.1465601901192@Atlassian.JIRA>
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Subject: [jira] [Commented] (HADOOP-13189) FairCallQueue makes callQueue
 larger than the configured capacity.
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archived-at: Fri, 10 Jun 2016 23:38:23 -0000


    [ https://issues.apache.org/jira/browse/HADOOP-13189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15325511#comment-15325511 ] 

Ming Ma commented on HADOOP-13189:
----------------------------------

Thanks Konstantin. Did you use https://issues.apache.org/jira/browse/HADOOP-10285 to change call CallQueue?

bq. when all requests go only into the high priority queue one should probably switch to the default queue as FairCallQueue functionality is not utilized.

This only happens at a given point of time, with FairCallQueue is useful in other times on the same NN.

> FairCallQueue makes callQueue larger than the configured capacity.
> ------------------------------------------------------------------
>
>                 Key: HADOOP-13189
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13189
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: ipc
>    Affects Versions: 2.6.0
>            Reporter: Konstantin Shvachko
>            Assignee: Vinitha Reddy Gankidi
>         Attachments: HADOOP-13189.001.patch, HADOOP-13189.002.patch, HADOOP-13189.003.patch
>
>
> {{FairCallQueue}} divides {{callQueue}} into multiple (4 by default) sub-queues, with each sub-queue corresponding to a different level of priority. The constructor for {{FairCallQueue}} takes the same parameter {{capacity}} as the default CallQueue implementation, and allocates all its sub-queues of size {{capacity}}. With 4 levels of priority (sub-queues) by default it results in the total callQueue size 4 times larger than it should be based on the configuration.
> {{capacity}} should be divided by the number of sub-queues at some place.


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