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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 Mon, 04 May 2015 01:14:08 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14526131#comment-14526131
] 

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

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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch |  14m 37s | Pre-patch trunk compilation is healthy. |
| {color:green}+1{color} | @author |   0m  0s | The patch does not contain any @author tags.
|
| {color:green}+1{color} | tests included |   0m  0s | The patch appears to include 4 new
or modified test files. |
| {color:green}+1{color} | javac |   7m 30s | There were no new javac warning messages. |
| {color:green}+1{color} | javadoc |   9m 37s | There were no new javadoc warning messages.
|
| {color:green}+1{color} | release audit |   0m 23s | The applied patch does not increase
the total number of release audit warnings. |
| {color:red}-1{color} | checkstyle |   2m 22s | The applied patch generated  1 new checkstyle
issues (total was 39, now 40). |
| {color:red}-1{color} | whitespace |   0m  1s | The patch has 15  line(s) that end in whitespace.
Use git apply --whitespace=fix. |
| {color:green}+1{color} | install |   1m 36s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 32s | The patch built with eclipse:eclipse.
|
| {color:green}+1{color} | findbugs |   5m 22s | The patch does not introduce any new Findbugs
(version 2.0.3) warnings. |
| {color:green}+1{color} | common tests |  22m 46s | Tests passed in hadoop-common. |
| {color:green}+1{color} | hdfs tests | 166m 38s | Tests passed in hadoop-hdfs. |
| {color:green}+1{color} | hdfs tests |   3m 56s | Tests passed in bkjournal. |
| | | 236m  2s | |
\\
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|| Subsystem || Report/Notes ||
| Patch URL | http://issues.apache.org/jira/secure/attachment/12669903/HDFS-3862.003.patch
|
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / a319771 |
| checkstyle |  https://builds.apache.org/job/PreCommit-HDFS-Build/10763/artifact/patchprocess/diffcheckstylehadoop-common.txt
|
| whitespace | https://builds.apache.org/job/PreCommit-HDFS-Build/10763/artifact/patchprocess/whitespace.txt
|
| hadoop-common test log | https://builds.apache.org/job/PreCommit-HDFS-Build/10763/artifact/patchprocess/testrun_hadoop-common.txt
|
| hadoop-hdfs test log | https://builds.apache.org/job/PreCommit-HDFS-Build/10763/artifact/patchprocess/testrun_hadoop-hdfs.txt
|
| bkjournal test log | https://builds.apache.org/job/PreCommit-HDFS-Build/10763/artifact/patchprocess/testrun_bkjournal.txt
|
| Test Results | https://builds.apache.org/job/PreCommit-HDFS-Build/10763/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf909.gq1.ygridcore.net 3.13.0-36-lowlatency #63-Ubuntu SMP PREEMPT Wed Sep
3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/10763/console |


This message was 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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