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Posted to common-dev@hadoop.apache.org by "Kihwal Lee (JIRA)" <ji...@apache.org> on 2013/09/19 23:39:53 UTC

[jira] [Created] (HADOOP-9981) listing in RawLocalFileSystem is inefficient

Kihwal Lee created HADOOP-9981:
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             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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