Li Bo created HDFS-7653:
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             Summary: Block Readers and Writers used in both client side and 
datanode side
                 Key: HDFS-7653
                 URL: https://issues.apache.org/jira/browse/HDFS-7653
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Li Bo
            Assignee: Li Bo


There're a lot of block read/write operations in HDFS-EC, for example, when 
client writes a file in striping layout, client has to write several blocks to 
several different datanodes; if a datanode wants to do an encoding/decoding 
task, it has to read several blocks from itself and other datanodes, and writes 
one or more blocks to itself or other datanodes.  



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