Colin Patrick McCabe created HDFS-7790:
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Summary: Do not create optional fields in DFSInputStream unless
they are needed
Key: HDFS-7790
URL: https://issues.apache.org/jira/browse/HDFS-7790
Project: Hadoop HDFS
Issue Type: Improvement
Components: dfsclient
Affects Versions: 2.3.0
Reporter: Colin Patrick McCabe
Assignee: Colin Patrick McCabe
{{DFSInputStream#oneByteBuffer}} and {{DFSInputStream#extendedReadBuffers}} are
only used some of the time, and they are always used under the positional lock.
Let's create them on demand to save memory.
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