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https://issues.apache.org/jira/browse/HBASE-22749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17037440#comment-17037440
 ] 

HBase QA commented on HBASE-22749:
----------------------------------

| (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 
35s{color} | {color:blue} Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {color} ||
| {color:green}+1{color} | {color:green} dupname {color} | {color:green}  0m  
1s{color} | {color:green} No case conflicting files found. {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 23 new or modified test 
files. {color} |
|| || || || {color:brown} master Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
40s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  5m 
15s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  2m  
5s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  2m 
26s{color} | {color:green} master passed {color} |
| {color:blue}0{color} | {color:blue} refguide {color} | {color:blue}  4m 
49s{color} | {color:blue} branch has no errors when building the reference 
guide. See footer for rendered docs, which you should manually inspect. {color} 
|
| {color:green}+1{color} | {color:green} shadedjars {color} | {color:green}  4m 
40s{color} | {color:green} branch has no errors when building our shaded 
downstream artifacts. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 
27s{color} | {color:green} master passed {color} |
| {color:blue}0{color} | {color:blue} spotbugs {color} | {color:blue}  4m  
8s{color} | {color:blue} Used deprecated FindBugs config; considering switching 
to SpotBugs. {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  0m 
17s{color} | {color:blue} branch/hbase-checkstyle no findbugs output file 
(findbugsXml.xml) {color} |
| {color:orange}-0{color} | {color:orange} patch {color} | {color:orange}  4m 
40s{color} | {color:orange} Used diff version of patch file. Binary files and 
potentially other changes not applied. Please rebase and squash commits if 
necessary. {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
15s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  5m 
 6s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  2m  
6s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  2m  
6s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  2m 
24s{color} | {color:green} root: The patch generated 0 new + 427 unchanged - 58 
fixed = 427 total (was 485) {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} xml {color} | {color:green}  0m  
3s{color} | {color:green} The patch has no ill-formed XML file. {color} |
| {color:blue}0{color} | {color:blue} refguide {color} | {color:blue}  4m 
48s{color} | {color:blue} patch has no errors when building the reference 
guide. See footer for rendered docs, which you should manually inspect. {color} 
|
| {color:green}+1{color} | {color:green} shadedjars {color} | {color:green}  4m 
44s{color} | {color:green} patch has no errors when building our shaded 
downstream artifacts. {color} |
| {color:green}+1{color} | {color:green} hadoopcheck {color} | {color:green} 
16m  5s{color} | {color:green} Patch does not cause any errors with Hadoop 
2.8.5 2.9.2 or 3.1.2. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 
27s{color} | {color:green} the patch passed {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  0m 
14s{color} | {color:blue} hbase-checkstyle has no data from findbugs {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  0m 
14s{color} | {color:green} hbase-checkstyle in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  1m  
7s{color} | {color:green} hbase-common in the patch passed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 66m 58s{color} 
| {color:red} hbase-server in the patch failed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  1m 
16s{color} | {color:green} hbase-it in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  2m 
13s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black}148m 45s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| Failed junit tests | hadoop.hbase.regionserver.TestTags |
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|| Subsystem || Report/Notes ||
| Docker | Client=19.03.6 Server=19.03.6 base: 
https://builds.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-921/13/artifact/out/Dockerfile
 |
| GITHUB PR | https://github.com/apache/hbase/pull/921 |
| JIRA Issue | HBASE-22749 |
| Optional Tests | dupname asflicense checkstyle javac javadoc unit xml 
refguide spotbugs findbugs shadedjars hadoopcheck hbaseanti compile |
| uname | Linux c6a2b99c5b64 4.15.0-60-generic #67-Ubuntu SMP Thu Aug 22 
16:55:30 UTC 2019 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | 
/home/jenkins/jenkins-slave/workspace/HBase-PreCommit-GitHub-PR_PR-921/out/precommit/personality/provided.sh
 |
| git revision | master / 0e96638898 |
| Default Java | 1.8.0_181 |
| refguide | 
https://builds.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-921/13/artifact/out/branch-site/book.html
 |
| refguide | 
https://builds.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-921/13/artifact/out/patch-site/book.html
 |
| unit | 
https://builds.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-921/13/artifact/out/patch-unit-hbase-server.txt
 |
|  Test Results | 
https://builds.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-921/13/testReport/
 |
| Max. process+thread count | 8412 (vs. ulimit of 10000) |
| modules | C: hbase-checkstyle hbase-common hbase-server hbase-it U: . |
| Console output | 
https://builds.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-921/13/console |
| versions | git=2.11.0 maven=2018-06-17T18:33:14Z) findbugs=3.1.11 |
| Powered by | Apache Yetus 0.11.1 https://yetus.apache.org |


This message was automatically generated.



> Distributed MOB compactions 
> ----------------------------
>
>                 Key: HBASE-22749
>                 URL: https://issues.apache.org/jira/browse/HBASE-22749
>             Project: HBase
>          Issue Type: New Feature
>          Components: mob
>            Reporter: Vladimir Rodionov
>            Assignee: Vladimir Rodionov
>            Priority: Major
>         Attachments: HBASE-22749-branch-2.2-v4.patch, 
> HBASE-22749-master-v1.patch, HBASE-22749-master-v2.patch, 
> HBASE-22749-master-v3.patch, HBASE-22749-master-v4.patch, 
> HBase-MOB-2.0-v3.0.pdf
>
>
> There are several  drawbacks in the original MOB 1.0  (Moderate Object 
> Storage) implementation, which can limit the adoption of the MOB feature:  
> # MOB compactions are executed in a Master as a chore, which limits 
> scalability because all I/O goes through a single HBase Master server. 
> # Yarn/Mapreduce framework is required to run MOB compactions in a scalable 
> way, but this won’t work in a stand-alone HBase cluster.
> # Two separate compactors for MOB and for regular store files and their 
> interactions can result in a data loss (see HBASE-22075)
> The design goals for MOB 2.0 were to provide 100% MOB 1.0 - compatible 
> implementation, which is free of the above drawbacks and can be used as a 
> drop in replacement in existing MOB deployments. So, these are design goals 
> of a MOB 2.0:
> # Make MOB compactions scalable without relying on Yarn/Mapreduce framework
> # Provide unified compactor for both MOB and regular store files
> # Make it more robust especially w.r.t. to data losses. 
> # Simplify and reduce the overall MOB code.
> # Provide 100% compatible implementation with MOB 1.0.
> # No migration of data should be required between MOB 1.0 and MOB 2.0 - just 
> software upgrade.



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