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https://issues.apache.org/jira/browse/HDFS-9261?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14976115#comment-14976115
 ] 

Hadoop QA commented on HDFS-9261:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch |  25m 24s | Pre-patch trunk compilation is 
healthy. |
| {color:green}+1{color} | @author |   0m  0s | The patch does not contain any 
@author tags. |
| {color:red}-1{color} | tests included |   0m  0s | 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:green}+1{color} | javac |  12m 25s | There were no new javac warning 
messages. |
| {color:green}+1{color} | javadoc |  16m 30s | There were no new javadoc 
warning messages. |
| {color:green}+1{color} | release audit |   0m 35s | The applied patch does 
not increase the total number of release audit warnings. |
| {color:red}-1{color} | checkstyle |   2m 24s | The applied patch generated  1 
new checkstyle issues (total was 8, now 9). |
| {color:green}+1{color} | whitespace |   0m  0s | The patch has no lines that 
end in whitespace. |
| {color:green}+1{color} | install |   2m 12s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 53s | The patch built with 
eclipse:eclipse. |
| {color:green}+1{color} | findbugs |   3m 27s | The patch does not introduce 
any new Findbugs (version 3.0.0) warnings. |
| {color:green}+1{color} | native |   5m 16s | Pre-build of native portion |
| {color:green}+1{color} | hdfs tests |   0m 48s | Tests passed in 
hadoop-hdfs-client. |
| | |  69m 59s | |
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|| Subsystem || Report/Notes ||
| Patch URL | 
http://issues.apache.org/jira/secure/attachment/12768919/HDFS-9261-01.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / 96677be |
| checkstyle |  
https://builds.apache.org/job/PreCommit-HDFS-Build/13220/artifact/patchprocess/diffcheckstylehadoop-hdfs-client.txt
 |
| hadoop-hdfs-client test log | 
https://builds.apache.org/job/PreCommit-HDFS-Build/13220/artifact/patchprocess/testrun_hadoop-hdfs-client.txt
 |
| Test Results | 
https://builds.apache.org/job/PreCommit-HDFS-Build/13220/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-HDFS-Build/13220/console |


This message was automatically generated.

> Erasure Coding: Skip encoding the data cells if all the parity data streamers 
> are failed for the current block group
> --------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-9261
>                 URL: https://issues.apache.org/jira/browse/HDFS-9261
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Rakesh R
>            Assignee: Rakesh R
>            Priority: Minor
>         Attachments: HDFS-9261-00.patch, HDFS-9261-01.patch
>
>
> {{DFSStripedOutputStream}} will continue writing with minimum number 
> (dataBlockNum) of live datanodes. It won't replace the failed datanodes 
> immediately for the current block group. Consider a case where all the parity 
> data streamers are failed, now it is unnecessary to encode the data block 
> cells and generate the parity data. This is a corner case where it can skip 
> {{writeParityCells()}} step.



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