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From "Wangda Tan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2314) ContainerManagementProtocolProxy can create thousands of threads for a large cluster
Date Mon, 13 Oct 2014 21:33:35 GMT

    [ https://issues.apache.org/jira/browse/YARN-2314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14170026#comment-14170026
] 

Wangda Tan commented on YARN-2314:
----------------------------------

Hi [~jlowe],
Looking at this issue recently. I think it will be not easy to change the under layer of RPC.

One question, according to the patch you mentioned in https://issues.apache.org/jira/browse/YARN-2314?focusedCommentId=14131901&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14131901,
do you have any data about is there any performance downgrade of this patch in your environment?
I'm wondering if we can just disable the cache and make the timeout to 0 as the standard behavior.

Thanks,
Wangda

> ContainerManagementProtocolProxy can create thousands of threads for a large cluster
> ------------------------------------------------------------------------------------
>
>                 Key: YARN-2314
>                 URL: https://issues.apache.org/jira/browse/YARN-2314
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: client
>    Affects Versions: 2.1.0-beta
>            Reporter: Jason Lowe
>            Priority: Critical
>         Attachments: disable-cm-proxy-cache.patch, nmproxycachefix.prototype.patch
>
>
> ContainerManagementProtocolProxy has a cache of NM proxies, and the size of this cache
is configurable.  However the cache can grow far beyond the configured size when running on
a large cluster and blow AM address/container limits.  More details in the first comment.



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