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Date: Fri, 10 Apr 2015 11:12:12 +0000 (UTC)
From: "Kai Zheng (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-7866) Erasure coding: NameNode manages EC
 schemas
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    [ https://issues.apache.org/jira/browse/HDFS-7866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14489387#comment-14489387 ] 

Kai Zheng commented on HDFS-7866:
---------------------------------

Hi [~rakeshr],

Thanks for your suggestions. I will make the changes in the next revision. Regarding {{refreshECSchemas}}, you're right we should do that. We should avoid having to restart NameNode just for the reloading. Note the operation should be protected, only for admin.

> Erasure coding: NameNode manages EC schemas
> -------------------------------------------
>
>                 Key: HDFS-7866
>                 URL: https://issues.apache.org/jira/browse/HDFS-7866
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Kai Zheng
>            Assignee: Kai Zheng
>         Attachments: HDFS-7866-v1.patch
>
>
> This is to extend NameNode to load, list and sync predefine EC schemas in authorized and controlled approach. The provided facilities will be used to implement DFSAdmin commands so admin can list available EC schemas, then could choose some of them for target EC zones.


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