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From "Kai Sasaki (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 06:15:53 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8020?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14394119#comment-14394119
] 

Kai Sasaki commented on HDFS-8020:
----------------------------------

According to design [doc|https://issues.apache.org/jira/secure/attachment/12708287/ECWorker-design-v2.pdf],
DN should receive {{DNA_ECENCODE}} or {{DNA_ECDECODE}} command from NameNode. But [HDFS-7369|https://issues.apache.org/jira/browse/HDFS-7369]
uses only {{DNA_CODEC}} instead of these command. Is there any changes about command design?
I think if there is only {{DNA_CODEC}} command, there is no way to decide to encode or decode.

> 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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