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Posted to common-issues@hadoop.apache.org by "Kai Zheng (JIRA)" <ji...@apache.org> on 2015/04/20 12:09:59 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-v1.patch
Uploaded the patch. Changes summary:
* Allowing least required inputs when decoding, using null to indicate not to read;
* Refining tests allowing to erase parity units;
* Refactored some codes incorporating change from other issues.
Will open similar issue separately for erasure coders as this is already rather large.
Pending for review.
> 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-v1.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.
> 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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