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https://issues.apache.org/jira/browse/HDFS-9198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15061148#comment-15061148
 ] 

Hadoop QA commented on HDFS-9198:
---------------------------------

| (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} @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 6 new or modified test 
files. {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 8m 
39s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 51s 
{color} | {color:green} trunk passed with JDK v1.8.0_66 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 47s 
{color} | {color:green} trunk passed with JDK v1.7.0_91 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 
19s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 1m 0s 
{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
14s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 2m 6s 
{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 16s 
{color} | {color:green} trunk passed with JDK v1.8.0_66 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 59s 
{color} | {color:green} trunk passed with JDK v1.7.0_91 {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m 
57s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 53s 
{color} | {color:green} the patch passed with JDK v1.8.0_66 {color} |
| {color:red}-1{color} | {color:red} javac {color} | {color:red} 7m 13s {color} 
| {color:red} hadoop-hdfs-project_hadoop-hdfs-jdk1.8.0_66 with JDK v1.8.0_66 
generated 3 new issues (was 32, now 32). {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 53s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 54s 
{color} | {color:green} the patch passed with JDK v1.7.0_91 {color} |
| {color:red}-1{color} | {color:red} javac {color} | {color:red} 8m 9s {color} 
| {color:red} hadoop-hdfs-project_hadoop-hdfs-jdk1.7.0_91 with JDK v1.7.0_91 
generated 3 new issues (was 34, now 34). {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 54s 
{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red} 0m 20s 
{color} | {color:red} Patch generated 5 new checkstyle issues in 
hadoop-hdfs-project/hadoop-hdfs (total was 384, now 384). {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 1m 7s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
17s {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} 2m 
31s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 24s 
{color} | {color:green} the patch passed with JDK v1.8.0_66 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 2m 11s 
{color} | {color:green} the patch passed with JDK v1.7.0_91 {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 66m 43s {color} 
| {color:red} hadoop-hdfs in the patch failed with JDK v1.8.0_66. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 57m 48s {color} 
| {color:red} hadoop-hdfs in the patch failed with JDK v1.7.0_91. {color} |
| {color:red}-1{color} | {color:red} asflicense {color} | {color:red} 0m 25s 
{color} | {color:red} Patch generated 58 ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 155m 53s {color} 
| {color:black} {color} |
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|| Reason || Tests ||
| JDK v1.8.0_66 Failed junit tests | 
hadoop.hdfs.server.namenode.ha.TestSeveralNameNodes |
|   | hadoop.hdfs.TestDFSUpgradeFromImage |
|   | hadoop.hdfs.server.datanode.TestBlockScanner |
|   | hadoop.hdfs.server.namenode.snapshot.TestRenameWithSnapshots |
|   | hadoop.hdfs.server.namenode.TestNNThroughputBenchmark |
| JDK v1.7.0_91 Failed junit tests | 
hadoop.hdfs.server.datanode.TestRefreshNamenodes |
|   | hadoop.hdfs.web.TestWebHDFS |
|   | hadoop.hdfs.server.namenode.snapshot.TestRenameWithSnapshots |
|   | hadoop.hdfs.server.namenode.TestNNThroughputBenchmark |
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:0ca8df7 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12778095/HDFS-9198-trunk.patch 
|
| JIRA Issue | HDFS-9198 |
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  
unit  findbugs  checkstyle  |
| uname | Linux c075728831b6 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 / 0f708d4 |
| findbugs | v3.0.0 |
| javac | hadoop-hdfs-project_hadoop-hdfs-jdk1.8.0_66: 
https://builds.apache.org/job/PreCommit-HDFS-Build/13902/artifact/patchprocess/diff-compile-javac-hadoop-hdfs-project_hadoop-hdfs-jdk1.8.0_66.txt
 |
| javac | hadoop-hdfs-project_hadoop-hdfs-jdk1.7.0_91: 
https://builds.apache.org/job/PreCommit-HDFS-Build/13902/artifact/patchprocess/diff-compile-javac-hadoop-hdfs-project_hadoop-hdfs-jdk1.7.0_91.txt
 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-HDFS-Build/13902/artifact/patchprocess/diff-checkstyle-hadoop-hdfs-project_hadoop-hdfs.txt
 |
| unit | 
https://builds.apache.org/job/PreCommit-HDFS-Build/13902/artifact/patchprocess/patch-unit-hadoop-hdfs-project_hadoop-hdfs-jdk1.8.0_66.txt
 |
| unit | 
https://builds.apache.org/job/PreCommit-HDFS-Build/13902/artifact/patchprocess/patch-unit-hadoop-hdfs-project_hadoop-hdfs-jdk1.7.0_91.txt
 |
| unit test logs |  
https://builds.apache.org/job/PreCommit-HDFS-Build/13902/artifact/patchprocess/patch-unit-hadoop-hdfs-project_hadoop-hdfs-jdk1.8.0_66.txt
 
https://builds.apache.org/job/PreCommit-HDFS-Build/13902/artifact/patchprocess/patch-unit-hadoop-hdfs-project_hadoop-hdfs-jdk1.7.0_91.txt
 |
| JDK v1.7.0_91  Test Results | 
https://builds.apache.org/job/PreCommit-HDFS-Build/13902/testReport/ |
| asflicense | 
https://builds.apache.org/job/PreCommit-HDFS-Build/13902/artifact/patchprocess/patch-asflicense-problems.txt
 |
| modules | C: hadoop-hdfs-project/hadoop-hdfs U: 
hadoop-hdfs-project/hadoop-hdfs |
| Max memory used | 75MB |
| Powered by | Apache Yetus 0.2.0-SNAPSHOT   http://yetus.apache.org |
| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/13902/console |


This message was automatically generated.



> Coalesce IBR processing in the NN
> ---------------------------------
>
>                 Key: HDFS-9198
>                 URL: https://issues.apache.org/jira/browse/HDFS-9198
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>    Affects Versions: 2.0.0-alpha
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>         Attachments: HDFS-9198-branch2.patch, HDFS-9198-trunk.patch, 
> HDFS-9198-trunk.patch, HDFS-9198-trunk.patch, HDFS-9198-trunk.patch, 
> HDFS-9198-trunk.patch
>
>
> IBRs from thousands of DNs under load will degrade NN performance due to 
> excessive write-lock contention from multiple IPC handler threads.  The IBR 
> processing is quick, so the lock contention may be reduced by coalescing 
> multiple IBRs into a single write-lock transaction.  The handlers will also 
> be freed up faster for other operations.



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