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Date: Wed, 19 Aug 2015 13:04:46 +0000 (UTC)
From: "Sunil G (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
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Subject: [jira] [Commented] (YARN-4024) YARN RM should avoid unnecessary
 resolving IP when NMs doing heartbeat
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    [ https://issues.apache.org/jira/browse/YARN-4024?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14702970#comment-14702970 ] 

Sunil G commented on YARN-4024:
-------------------------------

Hi [~zhiguohong]
Thanks for working on this. Some high level comments.

- I feel {{ExpireChecker}} could extend Timer class and it can be started from serviceStart of NodesListManager, and can be cancelled from serviceStop. Pls share your opinion.
- Since we use *removeCache*, I think *update* will be better suited as *addToCache*
- Please add more comments and details about *interface Resolver* and its api. I feel the api *resolve* has to be UnStable and Public for now. may be we can separate the interface to another file.

> 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: Improvement
>            Reporter: Wangda Tan
>            Assignee: Hong Zhiguo
>         Attachments: YARN-4024-draft-v2.patch, YARN-4024-draft-v3.patch, YARN-4024-draft.patch, YARN-4024-v4.patch
>
>
> 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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