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https://issues.apache.org/jira/browse/HDFS-7371?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14337349#comment-14337349
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Zhe Zhang commented on HDFS-7371:
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HDFS-7839 will implement the basic XAttr structure for EC policies.
> 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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