dragon created HDFS-10140:
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Summary: CLONE - Erasure Coding: reuse BlockReader when reading
the same block in pread
Key: HDFS-10140
URL: https://issues.apache.org/jira/browse/HDFS-10140
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: dragon
Assignee: Jing Zhao
Fix For: HDFS-7285
Currently in pread, we create a new block reader for each aligned stripe even
though these stripes belong to the same block. It's better to reuse them to
avoid unnecessary block reader creation overhead. This can also avoid reading
from the same bad DataNode.
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