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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3867) QJM: Support rolling restart of JNs
Date Thu, 06 Sep 2012 00:21:07 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3867?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13449299#comment-13449299
] 

Eli Collins commented on HDFS-3867:
-----------------------------------

Agree, I think rolling on restart is sufficient and we should tackle this feature more generally
as you suggest.
                
> QJM: Support rolling restart of JNs
> -----------------------------------
>
>                 Key: HDFS-3867
>                 URL: https://issues.apache.org/jira/browse/HDFS-3867
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: QuorumJournalManager (HDFS-3077)
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>
> In order to perform upgrades or other maintenance, it is useful to be able to perform
a rolling restart of the journal nodes while the NameNode is active.
> Currently, this does not work, because the NN only picks up restarted JNs again on the
beginning of the next log segment. So, if the NN does not roll after each node is restarted
in turn, the NN will eventually fail to commit to a quorum and crash.

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