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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9955) RPC idle connection closing is extremely inefficient
Date Thu, 14 Nov 2013 19:53:22 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9955?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13822820#comment-13822820
] 

Kihwal Lee commented on HADOOP-9955:
------------------------------------

Makes sense. +1 for the patch as is. 

> RPC idle connection closing is extremely inefficient
> ----------------------------------------------------
>
>                 Key: HADOOP-9955
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9955
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ipc
>    Affects Versions: 2.0.0-alpha, 3.0.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>         Attachments: HADOOP-9955.patch, HADOOP-9955.patch
>
>
> The RPC server listener loops accepting connections, distributing the new connections
to socket readers, and then conditionally & periodically performs a scan for idle connections.
 The idle scan choses a _random index range_ to scan in a _synchronized linked list_.
> With 20k+ connections, walking the range of indices in the linked list is extremely expensive.
 During the sweep, other threads (socket responder and readers) that want to close connections
are blocked, and no new connections are being accepted.



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