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https://issues.apache.org/jira/browse/HADOOP-9955?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13823090#comment-13823090
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Hudson commented on HADOOP-9955:
--------------------------------
SUCCESS: Integrated in Hadoop-trunk-Commit #4744 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/4744/])
HADOOP-9955. RPC idle connection closing is extremely inefficient (daryn)
(daryn: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1542111)
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/CHANGES.txt
*
/hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeys.java
*
/hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Server.java
*
/hadoop/common/trunk/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ipc/TestIPC.java
> 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
> Fix For: 3.0.0, 2.3.0, 0.23.10
>
> Attachments: HADOOP-9955.branch-23.patch, 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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