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Date: Wed, 21 Dec 2016 09:43:59 +0000 (UTC)
From: "Abhishek Modi (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-11180) Intermittent deadlock in NameNode
 when failover happens.
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archived-at: Wed, 21 Dec 2016 09:44:01 -0000


    [ https://issues.apache.org/jira/browse/HDFS-11180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15766614#comment-15766614 ] 

Abhishek Modi commented on HDFS-11180:
--------------------------------------

We have set:
<property>
<name>dfs.namenode.name.dir</name>
<value>
/media/ephemeral0/dfs/namenode,/media/ephemeral1/dfs/namenode
</value>
<property>
<name>dfs.namenode.shared.edits.dir</name>
<value>
qjournal://ec2-54-92-238-125.compute-1.amazonaws.com:8485;ec2-54-163-80-110.compute-1.amazonaws.com:8485;ec2-54-197-119-189.compute-1.amazonaws.com:8485/HACluster
</value>
</property>

We just followed the documentation for HA. What is the recommended settings for these parameters?

> Intermittent deadlock in NameNode when failover happens.
> --------------------------------------------------------
>
>                 Key: HDFS-11180
>                 URL: https://issues.apache.org/jira/browse/HDFS-11180
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.6.0
>            Reporter: Abhishek Modi
>            Assignee: Akira Ajisaka
>            Priority: Blocker
>              Labels: high-availability
>             Fix For: 2.8.0, 2.7.4, 3.0.0-alpha2, 2.6.6
>
>         Attachments: HDFS-11180-branch-2.01.patch, HDFS-11180-branch-2.6.01.patch, HDFS-11180-branch-2.7.01.patch, HDFS-11180-branch-2.8.01.patch, HDFS-11180.00.patch, HDFS-11180.01.patch, HDFS-11180.02.patch, HDFS-11180.03.patch, HDFS-11180.04.patch, jstack.log
>
>
> It is happening due to metrics getting updated at the same time when failover is happening. Please find attached jstack at that point of time.



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