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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8432) Introduce a minimum compatible layout version to allow downgrade in more rolling upgrade use cases.
Date Thu, 04 Jun 2015 00:58:39 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8432?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14571927#comment-14571927
] 

Hadoop QA commented on HDFS-8432:
---------------------------------

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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch |  17m 44s | 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 5 new
or modified test files. |
| {color:green}+1{color} | javac |   7m 27s | There were no new javac warning messages. |
| {color:green}+1{color} | javadoc |   9m 34s | 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 14s | The applied patch generated  1 new checkstyle
issues (total was 759, now 757). |
| {color:red}-1{color} | whitespace |   0m  4s | The patch has 6  line(s) that end in whitespace.
Use git apply --whitespace=fix. |
| {color:green}+1{color} | install |   1m 33s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 33s | The patch built with eclipse:eclipse.
|
| {color:green}+1{color} | findbugs |   3m 14s | The patch does not introduce any new Findbugs
(version 3.0.0) warnings. |
| {color:green}+1{color} | native |   3m 12s | Pre-build of native portion |
| {color:green}+1{color} | hdfs tests | 161m 11s | Tests passed in hadoop-hdfs. |
| | | 207m 14s | |
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|| Subsystem || Report/Notes ||
| Patch URL | http://issues.apache.org/jira/secure/attachment/12737377/HDFS-8432.002.patch
|
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / bc85959 |
| checkstyle |  https://builds.apache.org/job/PreCommit-HDFS-Build/11224/artifact/patchprocess/diffcheckstylehadoop-hdfs.txt
|
| whitespace | https://builds.apache.org/job/PreCommit-HDFS-Build/11224/artifact/patchprocess/whitespace.txt
|
| hadoop-hdfs test log | https://builds.apache.org/job/PreCommit-HDFS-Build/11224/artifact/patchprocess/testrun_hadoop-hdfs.txt
|
| Test Results | https://builds.apache.org/job/PreCommit-HDFS-Build/11224/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/11224/console |


This message was automatically generated.

> Introduce a minimum compatible layout version to allow downgrade in more rolling upgrade
use cases.
> ---------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-8432
>                 URL: https://issues.apache.org/jira/browse/HDFS-8432
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode, rolling upgrades
>            Reporter: Chris Nauroth
>            Assignee: Chris Nauroth
>         Attachments: HDFS-8432-HDFS-Downgrade-Extended-Support.pdf, HDFS-8432.001.patch,
HDFS-8432.002.patch
>
>
> Maintain the prior layout version during the upgrade window and reject attempts to use
new features until after the upgrade has been finalized.  This guarantees that the prior software
version can read the fsimage and edit logs if the administrator decides to downgrade.  This
will make downgrade usable for the majority of NameNode layout version changes, which just
involve introduction of new edit log operations.



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