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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11772) RPC Invoker relies on static ClientCache which has synchronized(this) blocks
Date Sat, 18 Apr 2015 23:18:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14501625#comment-14501625
] 

Hadoop QA commented on HADOOP-11772:
------------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12726398/HADOOP-11772-002.patch
  against trunk revision 497c86b.

    {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}.  There were no new javadoc 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
2.0.3) 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.

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/6122//testReport/
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/6122//console

This message is automatically generated.

> RPC Invoker relies on static ClientCache which has synchronized(this) blocks
> ----------------------------------------------------------------------------
>
>                 Key: HADOOP-11772
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11772
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ipc, performance
>            Reporter: Gopal V
>            Assignee: Akira AJISAKA
>         Attachments: HADOOP-11772-001.patch, HADOOP-11772-002.patch, HADOOP-11772-wip-001.patch,
HADOOP-11772-wip-002.patch, after-ipc-fix.png, dfs-sync-ipc.png, sync-client-bt.png, sync-client-threads.png
>
>
> {code}
>   private static ClientCache CLIENTS=new ClientCache();
> ...
>     this.client = CLIENTS.getClient(conf, factory);
> {code}
> Meanwhile in ClientCache
> {code}
> public synchronized Client getClient(Configuration conf,
>       SocketFactory factory, Class<? extends Writable> valueClass) {
> ...
>    Client client = clients.get(factory);
>     if (client == null) {
>       client = new Client(valueClass, conf, factory);
>       clients.put(factory, client);
>     } else {
>       client.incCount();
>     }
> {code}
> All invokers end up calling these methods, resulting in IPC clients choking up.
> !sync-client-threads.png!
> !sync-client-bt.png!
> !dfs-sync-ipc.png!



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