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From "Suresh Srinivas (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3211) JournalProtocol changes required for introducing epoch and fencing
Date Thu, 05 Apr 2012 22:58:24 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13247798#comment-13247798

Suresh Srinivas commented on HDFS-3211:

bq. Hi Suresh. Have you looked at HDFS-3189? Hopefully we can make our protocols similar with
the intent of eventually merging the two implementations.

I looked at it briefly. I think this patch should cover the changes you were making. Some
differences - newEpoch is called fence. We should finish HDFS-3077 discussions, and if changes
come out of it, we could make further changes to the protocol.
> JournalProtocol changes required for introducing epoch and fencing
> ------------------------------------------------------------------
>                 Key: HDFS-3211
>                 URL: https://issues.apache.org/jira/browse/HDFS-3211
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha, name-node
>    Affects Versions: Shared journals (HDFS-3092)
>            Reporter: Suresh Srinivas
>            Assignee: Suresh Srinivas
>         Attachments: HDFS-3211.txt, HDFS-3211.txt
> JournalProtocol changes to introduce epoch in every request. Adding new method fence
for fencing a JournalService. On BackupNode fence is a no-op. 

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