Improve FsShell's heap consumption by switching to listStatus that returns an
iterator
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Key: HADOOP-6732
URL: https://issues.apache.org/jira/browse/HADOOP-6732
Project: Hadoop Common
Issue Type: Improvement
Reporter: Hairong Kuang
Fix For: 0.22.0
When listing a large directory from the command line using the default heap
configuration, FsShell often runs out of memory. This is because all stats of
the entries under the directory need to be in memory before printing them. The
new API listStatus that returns an iterator of FileStatus, which implemented in
HDFS-1091, no longer requires that all entries are fetched first. Thus
switching to this new API will greatly improve the use of heap space.
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