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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-10916) Switch from "raw" to "system" namespace for erasure coding policy
Date Tue, 27 Sep 2016 22:31:20 GMT

     [ https://issues.apache.org/jira/browse/HDFS-10916?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrew Wang updated HDFS-10916:
-------------------------------
    Release Note: 
EC policy is now stored in the "system" extended attribute namespace rather than "raw". This
means the EC policy extended attribute is no longer directly accessible by users or preserved
across a distcp that preserves raw extended attributes.

Users can instead use HdfsAdmin#setErasureCodingPolicy and HdfsAdmin#getErasureCodingPolicy
to set and get the EC policy for a path.

> Switch from "raw" to "system" namespace for erasure coding policy
> -----------------------------------------------------------------
>
>                 Key: HDFS-10916
>                 URL: https://issues.apache.org/jira/browse/HDFS-10916
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: erasure-coding
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Andrew Wang
>            Assignee: Andrew Wang
>         Attachments: HDFS-10916.001.patch
>
>
> Currently EC policy is stored as in the raw xattr namespace. It would be better to store
this in "system" like storage policy.
> Raw is meant for attributes which need to be preserved across a distcp, like encryption
info. EC policy is more similar to replication factor or storage policy, which can differ
between the src and target of a distcp. 



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