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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10443) FairCallQueue makes callQueue larger than the configured capacity.
Date Fri, 20 May 2016 21:57:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15294326#comment-15294326
] 

Konstantin Shvachko commented on HDFS-10443:
--------------------------------------------

FairCallQueue was introduced by HADOOP-10282.

> FairCallQueue makes callQueue larger than the configured capacity.
> ------------------------------------------------------------------
>
>                 Key: HDFS-10443
>                 URL: https://issues.apache.org/jira/browse/HDFS-10443
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.6.0
>            Reporter: Konstantin Shvachko
>
> {{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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