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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-13017) verify implementations of IOStream.read(buffer, offset, bytes) fail fast if the bytes==0
Date Mon, 11 Apr 2016 21:40:25 GMT
Steve Loughran created HADOOP-13017:
---------------------------------------

             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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