Li Bo created HDFS-7678:
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             Summary: Block group reader with decode functionality
                 Key: HDFS-7678
                 URL: https://issues.apache.org/jira/browse/HDFS-7678
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Li Bo
            Assignee: Li Bo


A block group reader will read data from BlockGroup no matter in striping 
layout or contiguous layout. The corrupt blocks can be known before 
reading(told by namenode), or just be found during reading. The block group 
reader needs to do decoding work when some blocks are found corrupt.




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