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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-9981) listing in RawLocalFileSystem is inefficient
Date Thu, 19 Sep 2013 21:39:53 GMT
Kihwal Lee created HADOOP-9981:
----------------------------------

             Summary: listing in RawLocalFileSystem is inefficient
                 Key: HADOOP-9981
                 URL: https://issues.apache.org/jira/browse/HADOOP-9981
             Project: Hadoop Common
          Issue Type: Bug
    Affects Versions: 2.3.0
            Reporter: Kihwal Lee
            Priority: Critical


After HADOOP-9652, listStatus() or globStatus() calls against a local file system directory
is very slow.  A user was loading data from local file system to Hive and it took about 30
seconds. The same operation took less than a second pre-HADOOP-9652. 

The input path had many other files beside the input files and strace showed that fork &
exec of stat against each and every one of them. jstack confirmed that this was being done
from getNativeFileLinkStatus().



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