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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11847) Enhance raw coder allowing to read least required inputs in decoding
Date Tue, 19 May 2015 14:36:05 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11847?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14550542#comment-14550542
] 

Hadoop QA commented on HADOOP-11847:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch |  14m 51s | Pre-patch HDFS-7285 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 5 new
or modified test files. |
| {color:green}+1{color} | javac |   7m 36s | There were no new javac warning messages. |
| {color:green}+1{color} | javadoc |   9m 48s | There were no new javadoc warning messages.
|
| {color:red}-1{color} | release audit |   0m 14s | The applied patch generated 1 release
audit warnings. |
| {color:red}-1{color} | checkstyle |   1m  7s | The applied patch generated  3 new checkstyle
issues (total was 21, now 24). |
| {color:green}+1{color} | whitespace |   0m  6s | The patch has no lines that end in whitespace.
|
| {color:green}+1{color} | install |   1m 33s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 34s | The patch built with eclipse:eclipse.
|
| {color:green}+1{color} | findbugs |   1m 41s | The patch does not introduce any new Findbugs
(version 3.0.0) warnings. |
| {color:red}-1{color} | common tests |  22m 58s | Tests failed in hadoop-common. |
| | |  60m 35s | |
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|| Reason || Tests ||
| Failed unit tests | hadoop.security.token.delegation.web.TestWebDelegationToken |
\\
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|| Subsystem || Report/Notes ||
| Patch URL | http://issues.apache.org/jira/secure/attachment/12733811/HADOOP-11847-HDFS-7285-v6.patch
|
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | HDFS-7285 / 3676277 |
| Release Audit | https://builds.apache.org/job/PreCommit-HADOOP-Build/6739/artifact/patchprocess/patchReleaseAuditProblems.txt
|
| checkstyle |  https://builds.apache.org/job/PreCommit-HADOOP-Build/6739/artifact/patchprocess/diffcheckstylehadoop-common.txt
|
| hadoop-common test log | https://builds.apache.org/job/PreCommit-HADOOP-Build/6739/artifact/patchprocess/testrun_hadoop-common.txt
|
| Test Results | https://builds.apache.org/job/PreCommit-HADOOP-Build/6739/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf900.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-HADOOP-Build/6739/console |


This message was automatically generated.

> Enhance raw coder allowing to read least required inputs in decoding
> --------------------------------------------------------------------
>
>                 Key: HADOOP-11847
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11847
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: io
>            Reporter: Kai Zheng
>            Assignee: Kai Zheng
>              Labels: BB2015-05-TBR
>         Attachments: HADOOP-11847-HDFS-7285-v3.patch, HADOOP-11847-HDFS-7285-v4.patch,
HADOOP-11847-HDFS-7285-v5.patch, HADOOP-11847-HDFS-7285-v6.patch, HADOOP-11847-v1.patch, HADOOP-11847-v2.patch
>
>
> This is to enhance raw erasure coder to allow only reading least required inputs while
decoding. It will also refine and document the relevant APIs for better understanding and
usage. When using least required inputs, it may add computating overhead but will possiblly
outperform overall since less network traffic and disk IO are involved.
> This is something planned to do but just got reminded by [~zhz]' s question raised in
HDFS-7678, also copied here:
> bq.Kai Zheng I have a question about decoding: in a (6+3) schema, if block #2 is missing,
and I want to repair it with blocks 0, 1, 3, 4, 5, 8, how should I construct the inputs to
RawErasureDecoder#decode?
> With this work, hopefully the answer to above question would be obvious.



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