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From "Todd Lipcon (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3189) Add preliminary QJournalProtocol interface, translators
Date Tue, 03 Apr 2012 20:58:31 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3189?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Todd Lipcon updated HDFS-3189:

    Attachment: hdfs-3189-prelim.txt

Preliminary patch, there are still a couple TODOs/cleanup to do before this is committable.
> Add preliminary QJournalProtocol interface, translators
> -------------------------------------------------------
>                 Key: HDFS-3189
>                 URL: https://issues.apache.org/jira/browse/HDFS-3189
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: 2.0.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hdfs-3189-prelim.txt
> This JIRA is to add the preliminary code for the QJournalProtocol. This protocol differs
from JournalProtocol in the following ways:
> - each call has context information indicating the epoch number of the requester
> - it contains calls that are specific to epoch number generation, etc, which do not apply
to other journaling daemons such as the BackupNode
> My guess is that, at some point, we can merge back down to one protocol, but during the
initial implementation phase, it will be useful to have a distinct protocol for this project.

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