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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8020) Erasure Coding: restore BlockGroup and schema info from stripping coding command
Date Fri, 03 Apr 2015 21:37:53 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8020?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14395115#comment-14395115
] 

Kai Zheng commented on HDFS-8020:
---------------------------------

bq.In a generic scenario, we might even construct both a raw data block and a parity data
blocks through the same command.
Right, I think so too.
bq.What 4 cases do you have in mind?
As I mentioned above, I mean the 4 cases as, (encoding, decoding) X (stripping erasure coding,
non-stripping erasure coding).
bq.I meant HDFS-7859...
See. We have someone working on that issue already. I agree this issue has to depend on the
fact that the schema info must be present in the related command.

> Erasure Coding: restore BlockGroup and schema info from stripping coding command
> --------------------------------------------------------------------------------
>
>                 Key: HDFS-8020
>                 URL: https://issues.apache.org/jira/browse/HDFS-8020
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Kai Zheng
>            Assignee: Kai Sasaki
>
> As a task of HDFS-7344, to process *stripping* coding commands from NameNode or other
scheduler services/tools, we need to first be able to restore BlockGroup and schema information
in DataNode, which will be used to construct coding work.



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