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From "Hong Zhiguo (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4024) YARN RM should avoid unnecessary resolving IP when NMs doing heartbeat
Date Thu, 13 Aug 2015 10:08:46 GMT

    [ https://issues.apache.org/jira/browse/YARN-4024?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14695011#comment-14695011
] 

Hong Zhiguo commented on YARN-4024:
-----------------------------------

There's DNS cache in InetAddress. What's the benefit to have another layer of cache in memory?
 Maybe easier to control?

> 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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