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From "Wangda Tan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4024) YARN RM should avoid unnecessary resolving IP when NMs doing heartbeat
Date Fri, 14 Aug 2015 16:38:46 GMT

    [ https://issues.apache.org/jira/browse/YARN-4024?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14697341#comment-14697341
] 

Wangda Tan commented on YARN-4024:
----------------------------------

[~zhiguohong], the DNS cache is a global parameter for a JVM, correct? IMHO, we shouldn't
use the global parameter, because RM may need to get latest IP address from DNS for other
purpose. For example, RM needs to get latest address when NMs are registering (and also reconnect),
but it may not need it when NMs is running.

Thoughts?

> YARN RM should avoid unnecessary resolving IP when NMs doing heartbeat
> ----------------------------------------------------------------------
>
>                 Key: YARN-4024
>                 URL: https://issues.apache.org/jira/browse/YARN-4024
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Wangda Tan
>            Assignee: Hong Zhiguo
>
> Currently, YARN RM NodesListManager will resolve IP address every time when node doing
heartbeat. When DNS server becomes slow, NM heartbeat will be blocked and cannot make progress.



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