dragon created HDFS-9977:
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Summary: CLONE - Erasure coding: DFSInputStream with decode
functionality (pread)
Key: HDFS-9977
URL: https://issues.apache.org/jira/browse/HDFS-9977
Project: Hadoop HDFS
Issue Type: Sub-task
Affects Versions: HDFS-7285
Reporter: dragon
Assignee: Zhe Zhang
Fix For: HDFS-7285
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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