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From "Xinwei Qin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7866) Erasure coding: NameNode manages EC schemas
Date Tue, 14 Apr 2015 07:32:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14493720#comment-14493720
] 

Xinwei Qin  commented on HDFS-7866:
-----------------------------------

Hi, [~drankye]
{code}
+    /**
+     * TODO: HDFS-7859 persist into NameNode
+     * load persistent schemas from image and editlog, which is done only once
+     * during NameNode startup. This can be done here or in a separate method.
+     */ 
{code}
These annotation can be removed. Now loading persistent schemas from fsimage and editlog is
done in {{loadECSchemas()}} or {{loadState()}} method and these methods are called during
NameNode startup.

> 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, HDFS-7866-v2.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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