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https://issues.apache.org/jira/browse/HADOOP-9955?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13765752#comment-13765752
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Hadoop QA commented on HADOOP-9955:
-----------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12602836/HADOOP-9955.patch
against trunk revision .
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:red}-1 tests included{color}. The patch doesn't appear to include
any new or modified tests.
Please justify why no new tests are needed for this
patch.
Also please list what manual steps were performed to
verify this patch.
{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/3085//testReport/
Console output:
https://builds.apache.org/job/PreCommit-HADOOP-Build/3085//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
>
>
> 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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