Rui Li created HDFS-17914:
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Summary: Prevent DFSInputStream from issuing 0-byte reads
Key: HDFS-17914
URL: https://issues.apache.org/jira/browse/HDFS-17914
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs-client
Reporter: Rui Li
Currently, {{DFSInputStream#actualGetFromOneDataNode}} can issue an extra
{{BlockReader#read}} after the buffer is completely filled. This extra read can
cause a wasted slow-lane read into the bounce buffer for
{{{}BlockReaderLocal{}}}.
A possible fix is to terminate the loop once the requested slice is filled.
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