[jira] [Commented] (HADOOP-9955) RPC idle connection closing is extremely inefficient

["Hadoop QA (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-9955?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13822112#comment-13822112 ] 

Hadoop QA commented on HADOOP-9955:
-----------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12613753/HADOOP-9955.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new or modified test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-common-project/hadoop-common.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/3286//testReport/
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/3286//console

This message is automatically generated.

> 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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