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Posted to hdfs-dev@hadoop.apache.org by "dragon (JIRA)" <ji...@apache.org> on 2016/03/15 09:15:36 UTC

[jira] [Created] (HDFS-10023) CLONE - Send the EC schema to DataNode via EC encoding/recovering command

dragon created HDFS-10023:
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             Summary: CLONE - Send the EC schema to DataNode via EC encoding/recovering command
                 Key: HDFS-10023
                 URL: https://issues.apache.org/jira/browse/HDFS-10023
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: dragon
            Assignee: Uma Maheswara Rao G
             Fix For: HDFS-7285


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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