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https://issues.apache.org/jira/browse/HADOOP-15449?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16492536#comment-16492536
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Hudson commented on HADOOP-15449:
---------------------------------
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #14300 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/14300/])
HADOOP-15449. Increase default timeout of ZK session to avoid frequent
(aajisaka: rev 61df174e8b3d582183306cabfa2347c8b96322ff)
* (edit)
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ha/ZKFailoverController.java
* (edit) hadoop-common-project/hadoop-common/src/main/resources/core-default.xml
> Increase default timeout of ZK session to avoid frequent NameNode failover
> --------------------------------------------------------------------------
>
> Key: HADOOP-15449
> URL: https://issues.apache.org/jira/browse/HADOOP-15449
> Project: Hadoop Common
> Issue Type: Improvement
> Components: common
> Affects Versions: 2.7.4
> Reporter: Karthik Palanisamy
> Assignee: Karthik Palanisamy
> Priority: Critical
> Fix For: 2.10.0, 3.2.0, 3.1.1, 2.9.2, 3.0.3, 2.8.5
>
> Attachments: HADOOP-15449-002.patch, 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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