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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3077) Quorum-based protocol for reading and writing edit logs
Date Tue, 17 Jul 2012 10:14:37 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13416057#comment-13416057
] 

Hadoop QA commented on HDFS-3077:
---------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12536781/hdfs-3077.txt
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 13 new or modified test files.

    -1 javac.  The applied patch generated 2067 javac compiler warnings (more than the trunk's
current 2066 warnings).

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 eclipse:eclipse.  The patch built with eclipse:eclipse.

    -1 findbugs.  The patch appears to introduce 18 new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

    -1 core tests.  The patch failed these unit tests in hadoop-common-project/hadoop-common
hadoop-hdfs-project/hadoop-hdfs:

                  org.apache.hadoop.ha.TestZKFailoverController
                  org.apache.hadoop.io.file.tfile.TestTFileByteArrays
                  org.apache.hadoop.io.file.tfile.TestTFileJClassComparatorByteArrays
                  org.apache.hadoop.hdfs.qjournal.client.TestQuorumJournalManagerUnit
                  org.apache.hadoop.hdfs.qjournal.client.TestEpochsAreUnique
                  org.apache.hadoop.hdfs.qjournal.TestMiniJournalCluster
                  org.apache.hadoop.hdfs.server.namenode.metrics.TestNameNodeMetrics

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/2841//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HDFS-Build/2841//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-hdfs.html
Javac warnings: https://builds.apache.org/job/PreCommit-HDFS-Build/2841//artifact/trunk/patchprocess/diffJavacWarnings.txt
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/2841//console

This message is automatically generated.
                
> 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, hdfs-3077.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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