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From "Tsz Wo (Nicholas), SZE (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3212) Persist the epoch received by the JournalService
Date Thu, 05 Apr 2012 23:42:23 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13247855#comment-13247855
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Tsz Wo (Nicholas), SZE commented on HDFS-3212:
----------------------------------------------

> Also, if the JN restarts, when it comes up, how do you make sure that an old NN doesn't
come back to life with a startLogSegment transaction?

Is it the case that JN will reject it since the old NN has a smaller epoch?
                
> Persist the epoch received by the JournalService
> ------------------------------------------------
>
>                 Key: HDFS-3212
>                 URL: https://issues.apache.org/jira/browse/HDFS-3212
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha, name-node
>    Affects Versions: Shared journals (HDFS-3092)
>            Reporter: Suresh Srinivas
>
> epoch received over JournalProtocol should be persisted by JournalService.

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