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From "Karthik Palanisamy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15449) Frequent Namenode Flipover affecting user Jobs.
Date Mon, 07 May 2018 07:06:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15449?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16465524#comment-16465524
] 

Karthik Palanisamy commented on HADOOP-15449:
---------------------------------------------

Cc: [~arpitagarwal] [~anu]

> Frequent Namenode Flipover affecting user Jobs.
> -----------------------------------------------
>
>                 Key: HADOOP-15449
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15449
>             Project: Hadoop Common
>          Issue Type: Wish
>          Components: common
>    Affects Versions: 2.7.4
>            Reporter: Karthik Palanisamy
>            Priority: Critical
>         Attachments: HADOOP-15449.patch
>
>
> We observed from several users regarding Namenode flip-over is due to either zookeeper
disk slowness (higher fsync cost) or network issue. We would need to avoid flip-over issue
to some extent by increasing HA session timeout, ha.zookeeper.session-timeout.ms.
> Default value 5000 ms, seems very low in any production environment.  I would suggest
10000 ms as default session timeout.



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