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Aaron T. Myers commented on HDFS-7790:
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Patch looks good to me, and I'm confident that the test failures are unrelated. +1.
> 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
> Priority: Minor
> Attachments: HDFS-7790.001.patch
>
>
> {{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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