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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