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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3077) Quorum-based protocol for reading and writing edit logs
Date Tue, 04 Dec 2012 00:56:03 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3077?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HDFS-3077:
------------------------------

    Attachment: hdfs-3077-branch-2.txt

This patch consists of the full merge for branch-2. There were a few conflicts here and there
but nothing too major. A few notes I made while doing the backport:

    - Incorporates change from HDFS-4121 in trunk to add proto namespace declaration to QJournalProtocol.proto
    - change the pom.xml to include QJournalProtocol (part of HDFS-4041 from trunk)


This backport depends on HDFS-3049 and HDFS-3571 backports - I posted patches for those on
the respective JIRAs. I ran the tests in the qjournal package and they passed.
                
> 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, namenode
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: 3.0.0, QuorumJournalManager (HDFS-3077)
>
>         Attachments: hdfs-3077-branch-2.txt, hdfs-3077-partial.txt, hdfs-3077-test-merge.txt,
hdfs-3077.txt, hdfs-3077.txt, hdfs-3077.txt, hdfs-3077.txt, hdfs-3077.txt, hdfs-3077.txt,
hdfs-3077.txt, qjournal-design.pdf, qjournal-design.pdf, qjournal-design.pdf, qjournal-design.pdf,
qjournal-design.pdf, qjournal-design.pdf, qjournal-design.tex, qjournal-design.tex
>
>
> 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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