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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3077) Quorum-based protocol for reading and writing edit logs
Date Wed, 27 Jun 2012 04:20:46 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13401956#comment-13401956
] 

Suresh Srinivas commented on HDFS-3077:
---------------------------------------

bq. I would have liked to use the code exactly as it was, but the differences in design made
it too difficult to try to reconcile, and I ended up copy-pasting and modifying rather than
patching against that branch.
Todd, 3092 focused mainly on the server side. Some of the client side, we abandoned given
the work in 3077. I want to understand how the changes can be reconciled with 3092. Currently
BackupNode is being updated to used the JournalService. Once this is done, we were planning
to merge 3092 into trunk. How should we proceed to merge 3077 and 3092 to trunk?

bq. Andy asked me to post a link to the corresponding github branch: https://github.com/toddlipcon/hadoop-common/commits/qjm-patchseries
Is code review going to be based off of this or code changes into a branch on Apache Hadoop
code base?
                
> Quorum-based protocol for reading and writing edit logs
> -------------------------------------------------------
>
>                 Key: HDFS-3077
>                 URL: https://issues.apache.org/jira/browse/HDFS-3077
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: ha, name-node
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hdfs-3077-partial.txt, hdfs-3077.txt, qjournal-design.pdf, qjournal-design.pdf
>
>
> Currently, one of the weak points of the HA design is that it relies on shared storage
such as an NFS filer for the shared edit log. One alternative that has been proposed is to
depend on BookKeeper, a ZooKeeper subproject which provides a highly available replicated
edit log on commodity hardware. This JIRA is to implement another alternative, based on a
quorum commit protocol, integrated more tightly in HDFS and with the requirements driven only
by HDFS's needs rather than more generic use cases. More details to follow.

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