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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7839) Erasure coding: implement facilities in NameNode to create and manage EC zones
Date Fri, 27 Feb 2015 22:25:05 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14340937#comment-14340937

Kai Zheng commented on HDFS-7839:

To better reflect what's been doing here in the patch, sync and align this with HDFS-7349,
I adjusted the title and description, so this will focus on the NameNode side facilities,
HDFS-7349 will focus on the client side. Hope this works. 

> Erasure coding: implement facilities in NameNode to create and manage EC zones
> ------------------------------------------------------------------------------
>                 Key: HDFS-7839
>                 URL: https://issues.apache.org/jira/browse/HDFS-7839
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Zhe Zhang
>            Assignee: Zhe Zhang
>         Attachments: HDFS-7839-000.patch, HDFS-7839-001.patch
> As a quick first step to facilitate initial development and testing, HDFS-7347 added
EC configuration in file header as one storage policy. We have discussed and [concluded |https://issues.apache.org/jira/browse/HDFS-7285?focusedCommentId=14296210&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14296210]
that EC configurations should be part of XAttr. This JIRA aims to add the basic EC XAttr structure.
HDFS-7337 will add configurable and pluggable schema info.
> To summarize, this will focus on providing relevant facilities in NameNode side to create
and manage EC zones. EC zone will associate, reference and store the needed schema name as
XAttr. EC schema information will be persisted in NameNode elsewhere centrally.

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