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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 13:11:01 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11847?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14550397#comment-14550397
] 

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:red}-1{color} | patch |   0m  1s | The patch command could not apply the patch during
dryrun. |
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|| Subsystem || Report/Notes ||
| Patch URL | http://issues.apache.org/jira/secure/attachment/12733805/HADOOP-11847-v6.patch
|
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / de30d66 |
| Console output | https://builds.apache.org/job/PreCommit-HADOOP-Build/6738/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-v1.patch, HADOOP-11847-v2.patch, HADOOP-11847-v6.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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