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https://issues.apache.org/jira/browse/HBASE-15128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15154203#comment-15154203
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Hadoop QA commented on HBASE-15128:
-----------------------------------

| (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 0s 
{color} | {color:blue} Docker mode activated. {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:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m 41s 
{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 2m 
46s {color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 1m 29s 
{color} | {color:green} master passed with JDK v1.8.0_72 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 1m 36s 
{color} | {color:green} master passed with JDK v1.7.0_95 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 10m 
48s {color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 1m 
0s {color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} hbaseprotoc {color} | {color:green} 1m 
15s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 5m 3s 
{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 4s 
{color} | {color:green} master passed with JDK v1.8.0_72 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 18s 
{color} | {color:green} master passed with JDK v1.7.0_95 {color} |
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m 34s 
{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 1m 
54s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 1m 28s 
{color} | {color:green} the patch passed with JDK v1.8.0_72 {color} |
| {color:green}+1{color} | {color:green} cc {color} | {color:green} 1m 28s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 1m 28s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 1m 35s 
{color} | {color:green} the patch passed with JDK v1.7.0_95 {color} |
| {color:green}+1{color} | {color:green} cc {color} | {color:green} 1m 35s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 1m 35s 
{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red} 2m 10s 
{color} | {color:red} hbase-client: patch generated 5 new + 472 unchanged - 1 
fixed = 477 total (was 473) {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red} 4m 50s 
{color} | {color:red} hbase-server: patch generated 5 new + 336 unchanged - 1 
fixed = 341 total (was 337) {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
52s {color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} rubocop {color} | {color:red} 0m 13s 
{color} | {color:red} The applied patch generated 20 new + 782 unchanged - 3 
fixed = 802 total (was 785) {color} |
| {color:red}-1{color} | {color:red} ruby-lint {color} | {color:red} 0m 6s 
{color} | {color:red} The applied patch generated 54 new + 530 unchanged - 0 
fixed = 584 total (was 530) {color} |
| {color:red}-1{color} | {color:red} whitespace {color} | {color:red} 0m 0s 
{color} | {color:red} The patch has 5 line(s) that end in whitespace. Use git 
apply --whitespace=fix. {color} |
| {color:green}+1{color} | {color:green} hadoopcheck {color} | {color:green} 
25m 55s {color} | {color:green} Patch does not cause any errors with Hadoop 
2.4.0 2.4.1 2.5.0 2.5.1 2.5.2 2.6.1 2.6.2 2.6.3 2.7.1. {color} |
| {color:green}+1{color} | {color:green} hbaseprotoc {color} | {color:green} 1m 
10s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 6m 0s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 13s 
{color} | {color:green} the patch passed with JDK v1.8.0_72 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 22s 
{color} | {color:green} the patch passed with JDK v1.7.0_95 {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 0m 21s 
{color} | {color:green} hbase-protocol in the patch passed with JDK v1.8.0_72. 
{color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 0m 52s 
{color} | {color:green} hbase-client in the patch passed with JDK v1.8.0_72. 
{color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 110m 45s 
{color} | {color:red} hbase-server in the patch failed with JDK v1.8.0_72. 
{color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 9m 10s 
{color} | {color:green} hbase-shell in the patch passed with JDK v1.8.0_72. 
{color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 0m 28s 
{color} | {color:green} hbase-protocol in the patch passed with JDK v1.7.0_95. 
{color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 1m 1s 
{color} | {color:green} hbase-client in the patch passed with JDK v1.7.0_95. 
{color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 95m 1s 
{color} | {color:green} hbase-server in the patch passed with JDK v1.7.0_95. 
{color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 7m 39s 
{color} | {color:green} hbase-shell in the patch passed with JDK v1.7.0_95. 
{color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 
59s {color} | {color:green} Patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 308m 31s {color} 
| {color:black} {color} |
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|| Reason || Tests ||
| JDK v1.8.0_72 Timed out junit tests | 
org.apache.hadoop.hbase.regionserver.TestHRegion |
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|| Subsystem || Report/Notes ||
| Docker | Client=1.9.1 Server=1.9.1 Image:yetus/hbase:date2016-02-19 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12788610/HBASE-15128_v6.patch |
| JIRA Issue | HBASE-15128 |
| Optional Tests |  asflicense  javac  javadoc  unit  findbugs  hadoopcheck  
hbaseanti  checkstyle  compile  cc  hbaseprotoc  rubocop  ruby_lint  |
| uname | Linux 9e455b61ecfa 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 |
| Build tool | maven |
| Personality | 
/home/jenkins/jenkins-slave/workspace/PreCommit-HBASE-Build@2/component/dev-support/hbase-personality.sh
 |
| git revision | master / 8eedc96 |
| Default Java | 1.7.0_95 |
| Multi-JDK versions |  /usr/lib/jvm/java-8-oracle:1.8.0_72 
/usr/lib/jvm/java-7-openjdk-amd64:1.7.0_95 |
| findbugs | v3.0.0 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-HBASE-Build/603/artifact/patchprocess/diff-checkstyle-hbase-client.txt
 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-HBASE-Build/603/artifact/patchprocess/diff-checkstyle-hbase-server.txt
 |
| rubocop | v0.37.2 |
| rubocop | 
https://builds.apache.org/job/PreCommit-HBASE-Build/603/artifact/patchprocess/diff-patch-rubocop.txt
 |
| ruby-lint | v2.1.0 |
| ruby-lint | 
https://builds.apache.org/job/PreCommit-HBASE-Build/603/artifact/patchprocess/diff-patch-ruby-lint.txt
 |
| whitespace | 
https://builds.apache.org/job/PreCommit-HBASE-Build/603/artifact/patchprocess/whitespace-eol.txt
 |
| unit | 
https://builds.apache.org/job/PreCommit-HBASE-Build/603/artifact/patchprocess/patch-unit-hbase-server-jdk1.8.0_72.txt
 |
| unit test logs |  
https://builds.apache.org/job/PreCommit-HBASE-Build/603/artifact/patchprocess/patch-unit-hbase-server-jdk1.8.0_72.txt
 |
| JDK v1.7.0_95  Test Results | 
https://builds.apache.org/job/PreCommit-HBASE-Build/603/testReport/ |
| modules | C:  hbase-protocol   hbase-client   hbase-server   hbase-shell  U: 
. |
| Max memory used | 411MB |
| Powered by | Apache Yetus 0.2.0-SNAPSHOT   http://yetus.apache.org |
| Console output | 
https://builds.apache.org/job/PreCommit-HBASE-Build/603/console |


This message was automatically generated.



> Disable region splits and merges switch in master
> -------------------------------------------------
>
>                 Key: HBASE-15128
>                 URL: https://issues.apache.org/jira/browse/HBASE-15128
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Enis Soztutar
>            Assignee: Heng Chen
>             Fix For: 2.0.0, 1.3.0
>
>         Attachments: HBASE-15128.patch, HBASE-15128_v1.patch, 
> HBASE-15128_v3.patch, HBASE-15128_v5.patch, HBASE-15128_v6.patch
>
>
> In large clusters where region splits are frequent, and HBCK runs take 
> longer, the concurrent splits cause further problems in HBCK since HBCK 
> assumes a static state for the region partition map. We have just seen a case 
> where HBCK undo's a concurrently splitting region causing number of 
> inconsistencies to go up. 
> We can have a mode in master where splits and merges are disabled like the 
> balancer and catalog janitor switches. Master will reject the split requests 
> if regionservers decide to split. This switch can be turned on / off by the 
> admins and also automatically by HBCK while it is running (similar to 
> balancer switch being disabled by HBCK). 
> HBCK  should also disable the Catalog Janitor just in case. 



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