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From "Uma Maheswara Rao G (JIRA)" <j...@apache.org>
Subject [jira] [Work started] (HDFS-8137) Sends the EC schema to DataNode as well in EC encoding/recovering command
Date Thu, 30 Apr 2015 07:03:06 GMT

     [ https://issues.apache.org/jira/browse/HDFS-8137?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Work on HDFS-8137 started by Uma Maheswara Rao G.
-------------------------------------------------
> Sends the EC schema to DataNode as well in EC encoding/recovering command
> -------------------------------------------------------------------------
>
>                 Key: HDFS-8137
>                 URL: https://issues.apache.org/jira/browse/HDFS-8137
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Kai Zheng
>            Assignee: Uma Maheswara Rao G
>         Attachments: HDFS-8137-0.patch
>
>
> Discussed with [~umamaheswararao] and [~vinayrpet], we should also send the EC schema
to DataNode as well contained in the EC encoding/recovering command. The target DataNode will
use it to guide the executing of the task. 
> Another way would be, DataNode would just request schema actively thru a separate RPC
call, and as an optimization consideration, DataNode may cache schemas to avoid repeatedly
asking for the same schema twice.



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