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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9981) Listing in RawLocalFileSystem is inefficient
Date Tue, 24 Sep 2013 05:46:04 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13776010#comment-13776010
] 

Chris Nauroth commented on HADOOP-9981:
---------------------------------------

We've also seen a performance impact for Hive queries caused by the {{Globber}} changes. 
(Thanks to [~gopalv] for providing some profiling data.)  Is it best to revert so that we
unblock people who are seeing this performance impact, or do we expect this can be fixed quickly?
                
> 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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