[ 
https://issues.apache.org/jira/browse/HDFS-11096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16155502#comment-16155502
 ] 

Hadoop QA commented on HDFS-11096:
----------------------------------

| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m 
14s{color} | {color:blue} Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {color} ||
| {color:blue}0{color} | {color:blue} shelldocs {color} | {color:blue}  0m  
5s{color} | {color:blue} Shelldocs was not available. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green}  0m  
0s{color} | {color:green} The patch does not contain any @author tags. {color} |
| {color:red}-1{color} | {color:red} test4tests {color} | {color:red}  0m  
0s{color} | {color:red} The patch doesn't appear to include any new or modified 
tests. Please justify why no new tests are needed for this patch. Also please 
list what manual steps were performed to verify this patch. {color} |
|| || || || {color:brown} trunk Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
20s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 14m 
27s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m  
0s{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
19s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m  
0s{color} | {color:green} the patch passed {color} |
| {color:orange}-0{color} | {color:orange} pylint {color} | {color:orange}  0m  
9s{color} | {color:orange} The patch generated 422 new + 0 unchanged - 0 fixed 
= 422 total (was 0) {color} |
| {color:red}-1{color} | {color:red} shellcheck {color} | {color:red}  0m  
1s{color} | {color:red} The patch generated 120 new + 0 unchanged - 0 fixed = 
120 total (was 0) {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green}  0m 
 0s{color} | {color:green} The patch has no whitespace issues. {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
15s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 16m  9s{color} | 
{color:black} {color} |
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:71bbb86 |
| JIRA Issue | HDFS-11096 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12885601/HDFS-11096.002.patch |
| Optional Tests |  asflicense  mvnsite  unit  shellcheck  shelldocs  pylint  |
| uname | Linux 1791ffe017e9 3.13.0-123-generic #172-Ubuntu SMP Mon Jun 26 
18:04:35 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh 
|
| git revision | trunk / 1f3bc63 |
| shellcheck | v0.4.6 |
| pylint | v1.7.2 |
| pylint | 
https://builds.apache.org/job/PreCommit-HDFS-Build/21021/artifact/patchprocess/diff-patch-pylint.txt
 |
| shellcheck | 
https://builds.apache.org/job/PreCommit-HDFS-Build/21021/artifact/patchprocess/diff-patch-shellcheck.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HDFS-Build/21021/testReport/ |
| modules | C:  U:  |
| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/21021/console |
| Powered by | Apache Yetus 0.6.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> Support rolling upgrade between 2.x and 3.x
> -------------------------------------------
>
>                 Key: HDFS-11096
>                 URL: https://issues.apache.org/jira/browse/HDFS-11096
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: rolling upgrades
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Andrew Wang
>            Assignee: Sean Mackrory
>            Priority: Blocker
>         Attachments: HDFS-11096.001.patch, HDFS-11096.002.patch
>
>
> trunk has a minimum software version of 3.0.0-alpha1. This means we can't 
> rolling upgrade between branch-2 and trunk.
> This is a showstopper for large deployments. Unless there are very compelling 
> reasons to break compatibility, let's restore the ability to rolling upgrade 
> to 3.x releases.



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