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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7371) Loading predefined EC schemas from configuration
Date Thu, 05 Feb 2015 01:44:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7371?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14306421#comment-14306421
] 

Zhe Zhang commented on HDFS-7371:
---------------------------------

Thanks Kai.

It's an interesting and non-trivial question what should be configured on command line and
what should go into config XML files. We can refer to [encryption design | http://www.cloudera.com/content/cloudera/en/documentation/core/v5-2-x/topics/cdh_sg_hdfs_encryption.html].

> 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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