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From "Akira Ajisaka (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15449) ZK performance issues causing frequent Namenode failover
Date Fri, 11 May 2018 07:41:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15449?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16471606#comment-16471606
] 

Akira Ajisaka commented on HADOOP-15449:
----------------------------------------

+1. We observed the same issue.

> ZK performance issues causing frequent Namenode failover 
> ---------------------------------------------------------
>
>                 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
>            Assignee: 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 is 5000 ms, seems very low in any production environment.  I would suggest
10000 ms as default session timeout.
>  
> {code}
> ..
> 2018-05-04 03:54:36,848 INFO  zookeeper.ClientCnxn (ClientCnxn.java:run(1140)) - Client
session timed out, have not heard from server in 4689ms for sessionid 0x260e24bac500aa3, closing
socket connection and attempting reconnect 
> 2018-05-04 03:56:49,088 INFO  zookeeper.ClientCnxn (ClientCnxn.java:run(1140)) - Client
session timed out, have not heard from server in 3981ms for sessionid 0x360fd152b8700fe, closing
socket connection and attempting reconnect
> .. 
> {code}



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