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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, 08 Jun 2017 01:43:21 GMT

    [ https://issues.apache.org/jira/browse/YARN-4024?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16042057#comment-16042057
] 

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

[~maobaolong], this depends on the probability that nodes getting new IP address without shutting
down or NM restart.
If you are sure it's zero, then you can assign it a very big value. Actually this is the situation
of our clusters.

> 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
>          Components: resourcemanager
>            Reporter: Wangda Tan
>            Assignee: Hong Zhiguo
>             Fix For: 2.8.0, 3.0.0-alpha1
>
>         Attachments: YARN-4024-draft.patch, YARN-4024-draft-v2.patch, YARN-4024-draft-v3.patch,
YARN-4024-v4.patch, YARN-4024-v5.patch, YARN-4024-v6.patch, YARN-4024-v7.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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