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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-6732) Improve FsShell's heap consumption by switching to listStatus that returns an iterator
Date Thu, 29 Apr 2010 00:37:50 GMT
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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