Steve Loughran created HADOOP-13017:
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Summary: verify implementations of IOStream.read(buffer, offset,
bytes) fail fast if the bytes==0
Key: HADOOP-13017
URL: https://issues.apache.org/jira/browse/HADOOP-13017
Project: Hadoop Common
Issue Type: Improvement
Components: io
Affects Versions: 2.8.0
Reporter: Steve Loughran
HDFS-10277 showed that HDFS was return -1 on read(buf[], 0, 0) when there was
no data left in the stream; Java IO says
bq. If {{len}} is zero, then no bytes are read and {{0}} is returned;
otherwise, there is an attempt to read at least one byte.
This patch clarifies the fsinputstream specification, and fixes
{{DFSInputStream}} to address this
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