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https://issues.apache.org/jira/browse/HDFS-3077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13458986#comment-13458986
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Todd Lipcon commented on HDFS-3077:
-----------------------------------
bq. -1 javac. The applied patch generated 2056 javac compiler warnings (more
than the trunk's current 2055 warnings).
This is due to the addition of a new JSP page, which for some reason always
results in a new javac warning.
bq. -1 findbugs. The patch appears to introduce 3 new Findbugs (version 1.3.9)
warnings.
The new findbugs warnings are in trunk due to HADOOP-8805.
bq. -1 core tests. The patch failed these unit tests in
hadoop-common-project/hadoop-common hadoop-hdfs-project/hadoop-hdfs
hadoop-hdfs-project/hadoop-hdfs/src/contrib/bkjournal
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site:
All of these failures have been seen elsewhere and do not reproduce for me.
None of them should have any interaction with the modified code paths.
I'll send a status update on this branch to the hdfs-dev list in a few minutes.
> 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
> Fix For: QuorumJournalManager (HDFS-3077)
>
> Attachments: 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.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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