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https://issues.apache.org/jira/browse/HDFS-8865?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14707281#comment-14707281
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Hadoop QA commented on HDFS-8865:
---------------------------------

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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 50s | 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 2 new or modified test files. |
| {color:green}+1{color} | javac |   9m 22s | There were no new javac warning 
messages. |
| {color:green}+1{color} | javadoc |  11m 41s | There were no new javadoc 
warning messages. |
| {color:green}+1{color} | release audit |   0m 27s | The applied patch does 
not increase the total number of release audit warnings. |
| {color:red}-1{color} | checkstyle |   1m 42s | The applied patch generated  1 
new checkstyle issues (total was 471, now 469). |
| {color:green}+1{color} | whitespace |   0m  1s | The patch has no lines that 
end in whitespace. |
| {color:green}+1{color} | install |   1m 55s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 46s | The patch built with 
eclipse:eclipse. |
| {color:green}+1{color} | findbugs |   3m 15s | The patch does not introduce 
any new Findbugs (version 3.0.0) warnings. |
| {color:green}+1{color} | native |   3m 42s | Pre-build of native portion |
| {color:red}-1{color} | hdfs tests |  80m 10s | Tests failed in hadoop-hdfs. |
| | | 131m 57s | |
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|| Reason || Tests ||
| Timed out tests | org.apache.hadoop.hdfs.TestEncryptedTransfer |
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|| Subsystem || Report/Notes ||
| Patch URL | 
http://issues.apache.org/jira/secure/attachment/12751597/HDFS-8865.v3.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / 22de7c1 |
| checkstyle |  
https://builds.apache.org/job/PreCommit-HDFS-Build/12067/artifact/patchprocess/diffcheckstylehadoop-hdfs.txt
 |
| hadoop-hdfs test log | 
https://builds.apache.org/job/PreCommit-HDFS-Build/12067/artifact/patchprocess/testrun_hadoop-hdfs.txt
 |
| Test Results | 
https://builds.apache.org/job/PreCommit-HDFS-Build/12067/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf908.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/12067/console |


This message was automatically generated.

> Improve quota initialization performance
> ----------------------------------------
>
>                 Key: HDFS-8865
>                 URL: https://issues.apache.org/jira/browse/HDFS-8865
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>         Attachments: HDFS-8865.patch, HDFS-8865.v2.checkstyle.patch, 
> HDFS-8865.v2.patch, HDFS-8865.v3.patch
>
>
> After replaying edits, the whole file system tree is recursively scanned in 
> order to initialize the quota. For big name space, this can take a very long 
> time.  Since this is done during namenode failover, it also affects failover 
> latency.
> By using the Fork-Join framework, I was able to greatly reduce the 
> initialization time.  The following is the test result using the fsimage from 
> one of the big name nodes we have.
> || threads || seconds||
> | 1 (existing) | 55|
> | 1 (fork-join) | 68 |
> | 4 | 16 |
> | 8 | 8 |
> | 12 | 6 |
> | 16 | 5 |
> | 20 | 4 |



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