[ 
https://issues.apache.org/jira/browse/YARN-3949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14638031#comment-14638031
 ] 

Hadoop QA commented on YARN-3949:
---------------------------------

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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch |  21m 40s | Pre-patch YARN-2928 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 1 new or modified test files. |
| {color:green}+1{color} | javac |   8m 39s | There were no new javac warning 
messages. |
| {color:green}+1{color} | javadoc |  10m 30s | There were no new javadoc 
warning messages. |
| {color:green}+1{color} | release audit |   0m 21s | The applied patch does 
not increase the total number of release audit warnings. |
| {color:red}-1{color} | checkstyle |   1m 22s | The applied patch generated  1 
new checkstyle issues (total was 214, now 214). |
| {color:green}+1{color} | whitespace |   0m  1s | The patch has no lines that 
end in whitespace. |
| {color:green}+1{color} | install |   1m 34s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 44s | The patch built with 
eclipse:eclipse. |
| {color:green}+1{color} | findbugs |   2m 33s | The patch does not introduce 
any new Findbugs (version 3.0.0) warnings. |
| {color:green}+1{color} | yarn tests |   0m 22s | Tests passed in 
hadoop-yarn-api. |
| {color:green}+1{color} | yarn tests |   1m 23s | Tests passed in 
hadoop-yarn-server-timelineservice. |
| | |  49m 21s | |
\\
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|| Subsystem || Report/Notes ||
| Patch URL | 
http://issues.apache.org/jira/secure/attachment/12746679/YARN-3949-YARN-2928.001.patch
 |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | YARN-2928 / eb1932d |
| checkstyle |  
https://builds.apache.org/job/PreCommit-YARN-Build/8629/artifact/patchprocess/diffcheckstylehadoop-yarn-api.txt
 |
| hadoop-yarn-api test log | 
https://builds.apache.org/job/PreCommit-YARN-Build/8629/artifact/patchprocess/testrun_hadoop-yarn-api.txt
 |
| hadoop-yarn-server-timelineservice test log | 
https://builds.apache.org/job/PreCommit-YARN-Build/8629/artifact/patchprocess/testrun_hadoop-yarn-server-timelineservice.txt
 |
| Test Results | 
https://builds.apache.org/job/PreCommit-YARN-Build/8629/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf907.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-YARN-Build/8629/console |


This message was automatically generated.

> ensure timely flush of timeline writes
> --------------------------------------
>
>                 Key: YARN-3949
>                 URL: https://issues.apache.org/jira/browse/YARN-3949
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>    Affects Versions: YARN-2928
>            Reporter: Sangjin Lee
>            Assignee: Sangjin Lee
>         Attachments: YARN-3949-YARN-2928.001.patch
>
>
> Currently flushing of timeline writes is not really handled. For example, 
> {{HBaseTimelineWriterImpl}} relies on HBase's {{BufferedMutator}} to batch 
> and write puts asynchronously. However, {{BufferedMutator}} may not flush 
> them to HBase unless the internal buffer fills up.
> We do need a flush functionality first to ensure that data are written in a 
> reasonably timely manner, and to be able to ensure some critical writes are 
> done synchronously (e.g. key lifecycle events).



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