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From "Uma Maheswara Rao G (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-8137) Send the EC schema to DataNode via EC encoding/recovering command
Date Tue, 05 May 2015 05:55:06 GMT

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

Uma Maheswara Rao G updated HDFS-8137:
--------------------------------------
    Summary: Send the EC schema to DataNode via EC encoding/recovering command  (was: Sends
the EC schema to DataNode as well in EC encoding/recovering command)

> Send the EC schema to DataNode via 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, HDFS-8137-1.patch, HDFS-8137-2.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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