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From "Suresh Srinivas (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3212) Persist the epoch received by the JournalService
Date Thu, 05 Apr 2012 23:26:23 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13247836#comment-13247836
] 

Suresh Srinivas commented on HDFS-3212:
---------------------------------------

There is some discussion in HDFS-3077 about this. Currently two alternatives under consideration
are:
# Use the record we write during starting of a log segment to record the epoch. 
#* On fence method call, a JournalService promises not to accept any other requests from old
active.
#* After fence, the next call is to roll, when a new log segment is created. JournalService
records in this record the epoch.
#* This fits in nicely with every log segment belongs to a single epoch.
# Use a separate metadata file to record epoch.

Based on discussions in 3077, lets choose one of the options.
                
> 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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