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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7371) Loading predefined EC schemas from configuration
Date Wed, 04 Feb 2015 07:14:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7371?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14304730#comment-14304730
] 

Kai Zheng commented on HDFS-7371:
---------------------------------

[~zhz] has good idea to store schema parameters as xattributes and specify schema parameters
when define an EC ZONE via predefined schema list (discussed in HDFS-7349). So it's good to
adapt this issue and the work here for implementing predefining EC schemas.

> Loading predefined EC schemas from configuration
> ------------------------------------------------
>
>                 Key: HDFS-7371
>                 URL: https://issues.apache.org/jira/browse/HDFS-7371
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Kai Zheng
>            Assignee: Kai Zheng
>
> System administrator can configure multiple EC codecs in hdfs-site.xml file, and codec
instances or schemas in a new configuration file named ec-schema.xml in the conf folder. A
codec can be referenced by its instance or schema using the codec name, and a schema can be
utilized and specified by the schema name for a folder or EC ZONE to enforce EC. Once a schema
is used to define an EC ZONE, then its associated parameter values will be stored as xattributes
and respected thereafter.



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