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Posted to common-issues@hadoop.apache.org by "Kai Zheng (JIRA)" <ji...@apache.org> on 2015/05/04 11:44:06 UTC
[jira] [Updated] (HADOOP-11847) Enhance raw coder allowing to read
least required inputs in decoding
[ https://issues.apache.org/jira/browse/HADOOP-11847?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Kai Zheng updated HADOOP-11847:
-------------------------------
Attachment: HADOOP-11847-v4.patch
Updated the patch:
* Incorportated some refactoring changes from work for other issues;
* Checked and fixed some issues found by Hadoop QA building;
* Added more tests and comments.
> 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
> Attachments: HADOOP-11847-HDFS-7285-v3.patch, HADOOP-11847-v1.patch, HADOOP-11847-v2.patch, HADOOP-11847-v4.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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