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From "Kai Sasaki (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7717) Erasure Coding: provide a tool for convert files between replication and erasure coding
Date Mon, 30 Mar 2015 05:39:53 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7717?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14386218#comment-14386218
] 

Kai Sasaki commented on HDFS-7717:
----------------------------------

If there is an API provided by NN for getting meta information such as EC scheme and policy,
a like mover tool which is done as MR job might be easier one. This course depends on the
implementation of NN API.

And second one is that a converter itself does convert, error handling and reconstruction.
This course requires a lot of implementation more than the first course. But I am not sure
this is the better one. Due to the complexity, I think this might not be good idea anyway.


> Erasure Coding: provide a tool for convert files between replication and erasure coding
> ---------------------------------------------------------------------------------------
>
>                 Key: HDFS-7717
>                 URL: https://issues.apache.org/jira/browse/HDFS-7717
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Jing Zhao
>            Assignee: Kai Sasaki
>
> We need a tool to do offline conversion between replication and erasure coding. The tool
itself can either utilize MR just like the current distcp, or act like the balancer/mover.




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