Li Bo created HDFS-7679:
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             Summary: EC encode/decode framework
                 Key: HDFS-7679
                 URL: https://issues.apache.org/jira/browse/HDFS-7679
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Li Bo


EC tasks such as client striping write, encode replicated file to EC style,  
transform block layout from contiguous to striping, reconstruct some corrupt 
blocks, etc, have similar behavior. They all read data from client/BlockGroup, 
encode/decode them, and write the results to some datanodes. So we can use a 
unified framework to handle all these tasks. We can use different 
BlockGroupReader, Coder(ECEncoder/ECDecoder) and BlockWriter to handle 
different EC tasks.



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