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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3862) QJM: don't require a fencer to be configured if shared storage has built-in single-writer semantics
Date Fri, 19 Sep 2014 06:01:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14140046#comment-14140046
] 

Hadoop QA commented on HDFS-3862:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12669903/HDFS-3862.003.patch
  against trunk revision 6434572.

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 4 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:red}-1 core tests{color}.  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:

                  org.apache.hadoop.hdfs.web.TestWebHdfsFileSystemContract
                  org.apache.hadoop.hdfs.server.namenode.TestParallelImageWrite
                  org.apache.hadoop.hdfs.server.namenode.ha.TestPipelinesFailover
                  org.apache.hadoop.hdfs.server.namenode.ha.TestFailoverAndFencing

                                      The test build failed in hadoop-hdfs-project/hadoop-hdfs/src/contrib/bkjournal


    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/8096//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/8096//console

This message is automatically generated.

> QJM: don't require a fencer to be configured if shared storage has built-in single-writer
semantics
> ---------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-3862
>                 URL: https://issues.apache.org/jira/browse/HDFS-3862
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: QuorumJournalManager (HDFS-3077)
>            Reporter: Todd Lipcon
>            Assignee: Yi Liu
>         Attachments: HDFS-3862.001.patch, HDFS-3862.002.patch, HDFS-3862.003.patch
>
>
> Currently, NN HA requires that the administrator configure a fencing method to ensure
that only a single NameNode may write to the shared storage at a time. Some shared edits storage
implementations (like QJM) inherently enforce single-writer semantics at the storage level,
and thus the user should not be forced to specify one.
> We should extend the JournalManager interface so that the HA code can operate without
a configured fencer if the JM has such built-in fencing.



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