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