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https://issues.apache.org/jira/browse/HDFS-3211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13247800#comment-13247800
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Todd Lipcon commented on HDFS-3211:
-----------------------------------
Hi Suresh. You need to store the epoch persistently on disk to handle the case
of journal daemon restarts, I think. HDFS-3190 does a refactor to add a utility
class you can use for this.
> 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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