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https://issues.apache.org/jira/browse/HBASE-17387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15786340#comment-15786340
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Hadoop QA commented on HBASE-17387:
-----------------------------------

| (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 12s 
{color} | {color:blue} Docker mode activated. {color} |
| {color:blue}0{color} | {color:blue} patch {color} | {color:blue} 0m 1s 
{color} | {color:blue} The patch file was not named according to hbase's naming 
conventions. Please see 
https://yetus.apache.org/documentation/0.3.0/precommit-patchnames for 
instructions. {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: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:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m 18s 
{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 2m 
32s {color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 47s 
{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 
39s {color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
23s {color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 2m 
14s {color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 40s 
{color} | {color:green} master passed {color} |
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m 10s 
{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m 
53s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 47s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 47s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 
40s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
22s {color} | {color:green} the patch passed {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} hadoopcheck {color} | {color:green} 
23m 24s {color} | {color:green} Patch does not cause any errors with Hadoop 
2.6.1 2.6.2 2.6.3 2.6.4 2.6.5 2.7.1 2.7.2 2.7.3 or 3.0.0-alpha1. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 2m 
31s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 40s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 1m 3s 
{color} | {color:green} hbase-client in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 76m 10s 
{color} | {color:green} hbase-server in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 
30s {color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 115m 26s {color} 
| {color:black} {color} |
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|| Subsystem || Report/Notes ||
| Docker | Client=1.12.3 Server=1.12.3 Image:yetus/hbase:8d52d23 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12845108/17387.v2.txt |
| JIRA Issue | HBASE-17387 |
| Optional Tests |  asflicense  javac  javadoc  unit  findbugs  hadoopcheck  
hbaseanti  checkstyle  compile  |
| uname | Linux 394a329bf8b1 4.4.0-43-generic #63-Ubuntu SMP Wed Oct 12 
13:48:03 UTC 2016 x86_64 x86_64 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 / 001a26d |
| Default Java | 1.8.0_111 |
| findbugs | v3.0.0 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HBASE-Build/5089/testReport/ |
| modules | C: hbase-client hbase-server U: . |
| Console output | 
https://builds.apache.org/job/PreCommit-HBASE-Build/5089/console |
| Powered by | Apache Yetus 0.3.0   http://yetus.apache.org |


This message was automatically generated.



> Reduce the overhead of exception report in RegionActionResult for multi()
> -------------------------------------------------------------------------
>
>                 Key: HBASE-17387
>                 URL: https://issues.apache.org/jira/browse/HBASE-17387
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Ted Yu
>            Assignee: Ted Yu
>            Priority: Minor
>         Attachments: 17387.v1.txt, 17387.v2.txt
>
>
> For RSRpcServices#doNonAtomicRegionMutation() :
> {code}
>     for (ClientProtos.Action action: actions.getActionList()) {
> ...
>       } catch (IOException ie) {
>         rpcServer.getMetrics().exception(ie);
>         resultOrExceptionBuilder = ResultOrException.newBuilder().
>           setException(ResponseConverter.buildException(ie));
>       }
>       if (resultOrExceptionBuilder != null) {
>         // Propagate index.
>         resultOrExceptionBuilder.setIndex(action.getIndex());
>         builder.addResultOrException(resultOrExceptionBuilder.build());
>       }
> {code}
> The exceptions are added to builder in the for loop.
> The ClientProtos.ResultOrException.Builder instance is created within the for 
> loop.
> For large multi call, this may incur non-trivial overhead for garbage 
> collector if there're many exceptions.
> e.g. Here was sample debug log showing the actions in a batch:
> {code}
> 2016-12-23 04:21:56,263 DEBUG 
> org.apache.hadoop.hbase.regionserver.RSRpcServices: NonAtomicRegionMutation 
> batch summary: numAppends=0, numDeletes=11, numGets=0, numIncrements=15638, 
> numPuts=15627, numServiceCalls=0, serializedSize=3871713, 
> user=hbase/pob3.G.COM (auth:KERBEROS), client=null
> {code}
> Note the large number of increments in the batch.
> When the increments encounter conflict at server side, the overhead of 
> stringified exceptions in response is considerable.



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