reading from currently being written block does not work
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Key: HDFS-2034
URL: https://issues.apache.org/jira/browse/HDFS-2034
Project: Hadoop HDFS
Issue Type: Bug
Reporter: John George
Assignee: John George
This came up during HDFS-1907. Posting an example that Todd posted in HDFS-1907
that brought out this issue.
{quote}
Here's an example sequence to describe what I mean:
1. open file, write one and a half blocks
2. call hflush
3. another reader asks for the first byte of the second block
{quote}
In this case since offset is greater than the completed block length, the math
in getBlockRange() of DFSInputStreamer.java will set "length" to negative.
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