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Posted to hdfs-dev@hadoop.apache.org by "Kai Zheng (JIRA)" <ji...@apache.org> on 2015/04/14 01:09:12 UTC

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

Kai Zheng created HDFS-8137:
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             Summary: 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


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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