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Posted to hdfs-issues@hadoop.apache.org by "Kai Zheng (JIRA)" <ji...@apache.org> on 2015/04/30 10:25:06 UTC

[jira] [Commented] (HDFS-8137) Sends the EC schema to DataNode as well in EC encoding/recovering command

    [ https://issues.apache.org/jira/browse/HDFS-8137?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14521123#comment-14521123 ] 

Kai Zheng commented on HDFS-8137:
---------------------------------

Uma thanks for the patch and good comments. I'd like to look at this and give my thoughts later today.

> 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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