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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 21:16:54 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8020?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14395093#comment-14395093
] 

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

Hi Zhe,

bq.Actually DNA_CODEC is sufficient because we can always deduct ...
I guess it may also work if we have explicit commands and let a command like DNA_ECENCODE
drive the interpreting of the command parameters, thinking about we'll have at least 4 cases
?
bq.I think work on this JIRA should start after we have ECSchema class ...
Right. But we do have the class already (in the branch), or anything more other than it did
you mean?

> 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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