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https://issues.apache.org/jira/browse/HBASE-19116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16363010#comment-16363010
 ] 

Hadoop QA commented on HBASE-19116:
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| (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 
17s{color} | {color:blue} Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {color} ||
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  0m  
0s{color} | {color:blue} Findbugs executables are not available. {color} |
| {color:green}+1{color} | {color:green} hbaseanti {color} | {color:green}  0m  
0s{color} | {color:green} Patch does not have any anti-patterns. {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:green}+1{color} | {color:green} test4tests {color} | {color:green}  0m 
 0s{color} | {color:green} The patch appears to include 1 new or modified test 
files. {color} |
|| || || || {color:brown} branch-2 Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  3m 
37s{color} | {color:green} branch-2 passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
45s{color} | {color:green} branch-2 passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  1m 
 9s{color} | {color:green} branch-2 passed {color} |
| {color:green}+1{color} | {color:green} shadedjars {color} | {color:green}  5m 
 8s{color} | {color:green} branch has no errors when building our shaded 
downstream artifacts. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
28s{color} | {color:green} branch-2 passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  3m 
22s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
43s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 
43s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red}  1m  
7s{color} | {color:red} hbase-server: The patch generated 4 new + 18 unchanged 
- 2 fixed = 22 total (was 20) {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green}  0m 
 0s{color} | {color:green} The patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} shadedjars {color} | {color:green}  4m 
10s{color} | {color:green} patch has no errors when building our shaded 
downstream artifacts. {color} |
| {color:green}+1{color} | {color:green} hadoopcheck {color} | {color:green} 
14m 41s{color} | {color:green} Patch does not cause any errors with Hadoop 
2.6.5 2.7.4 or 3.0.0. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
30s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green}103m 
11s{color} | {color:green} hbase-server in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
18s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black}134m 21s{color} | 
{color:black} {color} |
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|| Subsystem || Report/Notes ||
| Docker | Client=17.05.0-ce Server=17.05.0-ce Image:yetus/hbase:9f2f2db |
| JIRA Issue | HBASE-19116 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12910426/HBASE-19116.branch-2.001.patch
 |
| Optional Tests |  asflicense  javac  javadoc  unit  findbugs  shadedjars  
hadoopcheck  hbaseanti  checkstyle  compile  |
| uname | Linux be4b69301fc8 3.13.0-139-generic #188-Ubuntu SMP Tue Jan 9 
14:43:09 UTC 2018 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | 
/home/jenkins/jenkins-slave/workspace/PreCommit-HBASE-Build/component/dev-support/hbase-personality.sh
 |
| git revision | branch-2 / 4594f7156d |
| maven | version: Apache Maven 3.5.2 
(138edd61fd100ec658bfa2d307c43b76940a5d7d; 2017-10-18T07:58:13Z) |
| Default Java | 1.8.0_151 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-HBASE-Build/11511/artifact/patchprocess/diff-checkstyle-hbase-server.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HBASE-Build/11511/testReport/ |
| Max. process+thread count | 4974 (vs. ulimit of 10000) |
| modules | C: hbase-server U: hbase-server |
| Console output | 
https://builds.apache.org/job/PreCommit-HBASE-Build/11511/console |
| Powered by | Apache Yetus 0.7.0   http://yetus.apache.org |


This message was automatically generated.



> Currently the tail of hfiles with CellComparator* classname makes it so 
> hbase1 can't open hbase2 written hfiles; fix
> --------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-19116
>                 URL: https://issues.apache.org/jira/browse/HBASE-19116
>             Project: HBase
>          Issue Type: Sub-task
>          Components: HFile, migration
>            Reporter: stack
>            Assignee: stack
>            Priority: Critical
>             Fix For: 2.0.0-beta-2
>
>         Attachments: HBASE-19116.branch-2.001.patch
>
>
> See tail of HBASE-19052 for discussion which concludes we should try and make 
> it so operators do not have to go to latest hbase version before they 
> upgrade, at least if we can avoid it.
> The necessary change of our default comparator from KV to Cell naming has 
> hfiles with tails that have the classname CellComparator in them in place of 
> KeyValueComparator. If an hbase1 tries to open them, it will fail not having 
> a CellComparator in its classpath (We have name of comparator in tail because 
> different files require different comparators... perhaps we write an alias 
> instead of a class one day... TODO). HBASE-16189 and HBASE-19052 are about 
> trying to carry knowledge of hbase2 back to hbase1, a brittle approach making 
> it so operators will have to upgrade to the latest branch-1 before they can 
> go to hbase2.
> This issue is about undoing our writing of an incompatible (to hbase1) tail, 
> not unless we really have to (and it sounds like we could do without writing 
> an incompatible tail) to see if we can avoid requiring operators go to 
> lastest branch-1 (we may end up needing this but lets a have a really good 
> reason for it if we do).
> Oh, let this filing be an answer to our [~anoop.hbase]'s old high-level 
> question over in HBASE-16189:
> bq. ...means when rolling upgrade done to 2.0, first users have to upgrade to 
> some 1.x versions which is having this fix and then to 2.0.. What do you guys 
> think Whether we should avoid this kind of indirection? cc Enis Soztutar, 
> Stack, Ted Yu, Matteo Bertozzi
> Yeah, lets try to avoid this if we can...



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