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