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https://issues.apache.org/jira/browse/HDFS-9768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15144413#comment-15144413
 ] 

Hadoop QA commented on HDFS-9768:
---------------------------------

| (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: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 9s 
{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 6m 
24s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 1m 11s 
{color} | {color:green} trunk passed with JDK v1.8.0_72 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 1m 17s 
{color} | {color:green} trunk passed with JDK v1.7.0_95 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 
30s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 1m 24s 
{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
26s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 3m 
27s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 21s 
{color} | {color:green} trunk passed with JDK v1.8.0_72 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 2m 7s 
{color} | {color:green} trunk passed with JDK v1.7.0_95 {color} |
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m 8s 
{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 1m 
14s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 1m 8s 
{color} | {color:green} the patch passed with JDK v1.8.0_72 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 1m 8s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 1m 16s 
{color} | {color:green} the patch passed with JDK v1.7.0_95 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 1m 16s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 
28s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 1m 20s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
23s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green} 0m 
0s {color} | {color:green} Patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 3m 
55s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 18s 
{color} | {color:green} the patch passed with JDK v1.8.0_72 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 2m 2s 
{color} | {color:green} the patch passed with JDK v1.7.0_95 {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 0m 46s 
{color} | {color:green} hadoop-hdfs-client in the patch passed with JDK 
v1.8.0_72. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 51m 31s {color} 
| {color:red} hadoop-hdfs in the patch failed with JDK v1.8.0_72. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 0m 55s 
{color} | {color:green} hadoop-hdfs-client in the patch passed with JDK 
v1.7.0_95. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 49m 8s {color} 
| {color:red} hadoop-hdfs in the patch failed with JDK v1.7.0_95. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 
20s {color} | {color:green} Patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 135m 33s {color} 
| {color:black} {color} |
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|| Reason || Tests ||
| JDK v1.8.0_72 Failed junit tests | hadoop.fs.TestHdfsNativeCodeLoader |
| JDK v1.7.0_95 Failed junit tests | hadoop.fs.TestHdfsNativeCodeLoader |
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:0ca8df7 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12787634/HDFS-9768.003.patch |
| JIRA Issue | HDFS-9768 |
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  
unit  findbugs  checkstyle  |
| uname | Linux aea87ae342a5 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 | /testptch/hadoop/patchprocess/precommit/personality/provided.sh 
|
| git revision | trunk / 2fb423e |
| 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 |
| unit | 
https://builds.apache.org/job/PreCommit-HDFS-Build/14475/artifact/patchprocess/patch-unit-hadoop-hdfs-project_hadoop-hdfs-jdk1.8.0_72.txt
 |
| unit | 
https://builds.apache.org/job/PreCommit-HDFS-Build/14475/artifact/patchprocess/patch-unit-hadoop-hdfs-project_hadoop-hdfs-jdk1.7.0_95.txt
 |
| unit test logs |  
https://builds.apache.org/job/PreCommit-HDFS-Build/14475/artifact/patchprocess/patch-unit-hadoop-hdfs-project_hadoop-hdfs-jdk1.8.0_72.txt
 
https://builds.apache.org/job/PreCommit-HDFS-Build/14475/artifact/patchprocess/patch-unit-hadoop-hdfs-project_hadoop-hdfs-jdk1.7.0_95.txt
 |
| JDK v1.7.0_95  Test Results | 
https://builds.apache.org/job/PreCommit-HDFS-Build/14475/testReport/ |
| modules | C:  hadoop-hdfs-project/hadoop-hdfs-client   
hadoop-hdfs-project/hadoop-hdfs  U: hadoop-hdfs-project |
| Max memory used | 77MB |
| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/14475/console |
| Powered by | Apache Yetus 0.2.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> Reuse objectMapper instance in HDFS to improve the performance
> --------------------------------------------------------------
>
>                 Key: HDFS-9768
>                 URL: https://issues.apache.org/jira/browse/HDFS-9768
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: performance
>    Affects Versions: 2.7.1
>            Reporter: Lin Yiqun
>            Assignee: Lin Yiqun
>         Attachments: HDFS-9768.001.patch, HDFS-9768.002.patch, 
> HDFS-9768.003.patch
>
>
> In HDFS-9724, it have reused the ObjectMapper instance to improve the 
> performance in {{WebHDFS}}. But in other places, it still using ObjectMapper 
> by {{new ObjectMapper()}}. We probably need a comprehensive review across the 
> whole codebase to look for this pattern and modify them. In MAPREDUCE-6626, 
> YARN-4668, these jiras also work for this.



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