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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4859) Add timeout in FileJournalManager
Date Thu, 30 May 2013 02:12:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13669982#comment-13669982
] 

Kihwal Lee commented on HDFS-4859:
----------------------------------

Thank you for the clarification. Fortunately I have a little bit of experience in Linux kernel,
storage and fault-tolerance, so I was able to digest what you have described so far. Although
you do not recommend the NFS + manual failover, I now understand you are not against a FJM
improvement that could benefit existing installations as part of continuing support. I don't
believe addition of this feature will be interpreted as a promotion or encouragement, since
QJM+ZKFC is clearly newer, more capable and users like your customers are happy with it.
                
> Add timeout in FileJournalManager
> ---------------------------------
>
>                 Key: HDFS-4859
>                 URL: https://issues.apache.org/jira/browse/HDFS-4859
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: ha, namenode
>    Affects Versions: 2.0.4-alpha
>            Reporter: Kihwal Lee
>
> Due to absence of explicit timeout in FileJournalManager, error conditions that incur
long delay (usually until driver timeout) can make namenode unresponsive for long time. This
directly affects NN's failure detection latency, which is critical in HA.

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