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https://issues.apache.org/jira/browse/HBASE-20679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16515481#comment-16515481
 ] 

Hadoop QA commented on HBASE-20679:
-----------------------------------

| (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 
18s{color} | {color:blue} Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {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 2 new or modified test 
files. {color} |
|| || || || {color:brown} master Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
22s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  5m 
33s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  8m 
26s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  2m 
32s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} shadedjars {color} | {color:green}  5m 
26s{color} | {color:green} branch has no errors when building our shaded 
downstream artifacts. {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  0m  
0s{color} | {color:blue} Skipped patched modules with no Java source: . {color} 
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| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  0m 
28s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  3m 
46s{color} | {color:green} master passed {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:red}-1{color} | {color:red} mvninstall {color} | {color:red}  5m 
42s{color} | {color:red} root in the patch failed. {color} |
| {color:red}-1{color} | {color:red} compile {color} | {color:red}  8m  
3s{color} | {color:red} root in the patch failed. {color} |
| {color:red}-1{color} | {color:red} javac {color} | {color:red}  8m  3s{color} 
| {color:red} root in the patch failed. {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red}  2m 
30s{color} | {color:red} root: The patch generated 3 new + 43 unchanged - 0 
fixed = 46 total (was 43) {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:red}-1{color} | {color:red} shadedjars {color} | {color:red}  4m 
29s{color} | {color:red} patch has 10 errors when building our shaded 
downstream artifacts. {color} |
| {color:red}-1{color} | {color:red} hadoopcheck {color} | {color:red}  5m  
2s{color} | {color:red} The patch causes 10 errors with Hadoop v2.7.4. {color} |
| {color:red}-1{color} | {color:red} hadoopcheck {color} | {color:red} 10m 
19s{color} | {color:red} The patch causes 10 errors with Hadoop v3.0.0. {color} 
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| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  0m  
0s{color} | {color:blue} Skipped patched modules with no Java source: . {color} 
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| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  0m 
35s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  3m 
26s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:red}-1{color} | {color:red} unit {color} | {color:red}184m 20s{color} 
| {color:red} root in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
52s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black}248m  5s{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:b002b0b |
| JIRA Issue | HBASE-20679 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12928138/HBASE-20679.005.patch 
|
| Optional Tests |  asflicense  javac  javadoc  unit  shadedjars  hadoopcheck  
xml  compile  findbugs  hbaseanti  checkstyle  |
| uname | Linux 73fa0b03b22e 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 | master / ac5bb8155b |
| maven | version: Apache Maven 3.5.3 
(3383c37e1f9e9b3bc3df5050c29c8aff9f295297; 2018-02-24T19:49:05Z) |
| Default Java | 1.8.0_171 |
| findbugs | v3.1.0-RC3 |
| mvninstall | 
https://builds.apache.org/job/PreCommit-HBASE-Build/13290/artifact/patchprocess/patch-mvninstall-root.txt
 |
| compile | 
https://builds.apache.org/job/PreCommit-HBASE-Build/13290/artifact/patchprocess/patch-compile-root.txt
 |
| javac | 
https://builds.apache.org/job/PreCommit-HBASE-Build/13290/artifact/patchprocess/patch-compile-root.txt
 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-HBASE-Build/13290/artifact/patchprocess/diff-checkstyle-root.txt
 |
| shadedjars | 
https://builds.apache.org/job/PreCommit-HBASE-Build/13290/artifact/patchprocess/patch-shadedjars.txt
 |
| hadoopcheck | 
https://builds.apache.org/job/PreCommit-HBASE-Build/13290/artifact/patchprocess/patch-javac-2.7.4.txt
 |
| hadoopcheck | 
https://builds.apache.org/job/PreCommit-HBASE-Build/13290/artifact/patchprocess/patch-javac-3.0.0.txt
 |
| unit | 
https://builds.apache.org/job/PreCommit-HBASE-Build/13290/artifact/patchprocess/patch-unit-root.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HBASE-Build/13290/testReport/ |
| Max. process+thread count | 4553 (vs. ulimit of 10000) |
| modules | C: hbase-http . U: . |
| Console output | 
https://builds.apache.org/job/PreCommit-HBASE-Build/13290/console |
| Powered by | Apache Yetus 0.7.0   http://yetus.apache.org |


This message was automatically generated.



> Add the ability to compile JSP dynamically in Jetty
> ---------------------------------------------------
>
>                 Key: HBASE-20679
>                 URL: https://issues.apache.org/jira/browse/HBASE-20679
>             Project: HBase
>          Issue Type: New Feature
>    Affects Versions: 2.0.0
>            Reporter: Allan Yang
>            Assignee: Allan Yang
>            Priority: Major
>             Fix For: 3.0.0
>
>         Attachments: HBASE-20679.002.patch, HBASE-20679.003.patch, 
> HBASE-20679.004.patch, HBASE-20679.005.patch, HBASE-20679.patch
>
>
> As discussed in HBASE-20617, adding the ability to dynamically compile jsp 
> enable us to do some hot fix. 
>  For example, several days ago, in our testing HBase-2.0 cluster, 
> procedureWals were corrupted due to some unknown reasons. After restarting 
> the cluster, since some procedures(AssignProcedure for example) were 
> corrupted and couldn't be replayed. Some regions were stuck in RIT forever. 
> We couldn't use HBCK since it haven't support AssignmentV2 yet. As a matter 
> of fact, the namespace region was not online, so the master was not inited, 
> we even couldn't use shell command like assign/move. But, we wrote a jsp and 
> fix this issue easily. The jsp file is like this:
> {code:java}
> <%
>   String action = request.getParameter("action");
>   HMaster master = (HMaster)getServletContext().getAttribute(HMaster.MASTER);
>   List<RegionInfo> offlineRegionsToAssign = new ArrayList<>();
>   List<RegionStates.RegionStateNode> regionRITs = 
> master.getAssignmentManager()
>           .getRegionStates().getRegionsInTransition();
>   for (RegionStates.RegionStateNode regionStateNode :  regionRITs) {
>     // if regionStateNode don't have a procedure attached, but meta state 
> shows
>     // this region is in RIT, that means the previous procedure may be 
> corrupted
>     // we need to create a new assignProcedure to assign them
>     if (!regionStateNode.isInTransition()) {
>       offlineRegionsToAssign.add(regionStateNode.getRegionInfo());
>       out.println("RIT region:" + regionStateNode);
>     }
>   }
>   // Assign offline regions. Uses round-robin.
>   if ("fix".equals(action) && offlineRegionsToAssign.size() > 0) {
>     
> master.getMasterProcedureExecutor().submitProcedures(master.getAssignmentManager().
>             createRoundRobinAssignProcedures(offlineRegionsToAssign));
>   } else {
>     out.println("use ?action=fix to fix RIT regions");
>   }
> %>
> {code}
> Above it is only one example we can do if we have the ability to compile jsp 
> dynamically. We think it is very useful.



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