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https://issues.apache.org/jira/browse/HDFS-3211?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Suresh Srinivas updated HDFS-3211:
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Attachment: HDFS-3211.txt
Early version of the patch with changes:
# Changed JournalProtocol to use JournalInfo instead of NamenodeRegistration -
continuing the work from HDFS-3204.
# All Journal methods are changed to include epoch
# Added fence method to JournalProtocol.
#* fence is allowed only if epoch is higher
#* In JournalService, in fence method the epoch is saved. Subsequently only the
requests with that epoch succeeds.
Will add unit tests.
> 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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