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Posted to common-dev@hadoop.apache.org by "Karthik Palanisamy (JIRA)" <ji...@apache.org> on 2018/05/07 07:03:00 UTC

[jira] [Created] (HADOOP-15449) Frequent Namenode Flipover affecting user Jobs.

Karthik Palanisamy created HADOOP-15449:
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             Summary: 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


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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