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https://issues.apache.org/jira/browse/HDFS-9198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14944117#comment-14944117
 ] 

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

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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch |  18m  6s | Pre-patch trunk compilation is 
healthy. |
| {color:green}+1{color} | @author |   0m  0s | The patch does not contain any 
@author tags. |
| {color:green}+1{color} | tests included |   0m  0s | The patch appears to 
include 3 new or modified test files. |
| {color:green}+1{color} | javac |   8m  4s | There were no new javac warning 
messages. |
| {color:green}+1{color} | javadoc |  10m 22s | There were no new javadoc 
warning messages. |
| {color:red}-1{color} | release audit |   0m 15s | The applied patch generated 
1 release audit warnings. |
| {color:red}-1{color} | checkstyle |   1m 25s | The applied patch generated  6 
new checkstyle issues (total was 424, now 425). |
| {color:green}+1{color} | whitespace |   0m  6s | The patch has no lines that 
end in whitespace. |
| {color:green}+1{color} | install |   1m 31s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 34s | The patch built with 
eclipse:eclipse. |
| {color:red}-1{color} | findbugs |   2m 33s | The patch appears to introduce 1 
new Findbugs (version 3.0.0) warnings. |
| {color:green}+1{color} | native |   3m 16s | Pre-build of native portion |
| {color:red}-1{color} | hdfs tests | 200m  1s | Tests failed in hadoop-hdfs. |
| | | 246m 16s | |
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|| Reason || Tests ||
| FindBugs | module:hadoop-hdfs |
| Failed unit tests | hadoop.hdfs.web.TestWebHdfsTimeouts |
|   | hadoop.hdfs.security.TestDelegationTokenForProxyUser |
|   | hadoop.hdfs.TestParallelRead |
|   | hadoop.hdfs.server.namenode.TestDeadDatanode |
|   | hadoop.hdfs.web.TestWebHdfsContentLength |
|   | hadoop.hdfs.server.blockmanagement.TestPendingReplication |
|   | hadoop.hdfs.server.datanode.TestIncrementalBrVariations |
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|| Subsystem || Report/Notes ||
| Patch URL | 
http://issues.apache.org/jira/secure/attachment/12765032/HDFS-9198-trunk.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / b925cf1 |
| Release Audit | 
https://builds.apache.org/job/PreCommit-HDFS-Build/12794/artifact/patchprocess/patchReleaseAuditProblems.txt
 |
| checkstyle |  
https://builds.apache.org/job/PreCommit-HDFS-Build/12794/artifact/patchprocess/diffcheckstylehadoop-hdfs.txt
 |
| Findbugs warnings | 
https://builds.apache.org/job/PreCommit-HDFS-Build/12794/artifact/patchprocess/newPatchFindbugsWarningshadoop-hdfs.html
 |
| hadoop-hdfs test log | 
https://builds.apache.org/job/PreCommit-HDFS-Build/12794/artifact/patchprocess/testrun_hadoop-hdfs.txt
 |
| Test Results | 
https://builds.apache.org/job/PreCommit-HDFS-Build/12794/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf904.gq1.ygridcore.net 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 |
| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/12794/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
>
>
> 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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