You are viewing a plain text version of this content. The canonical link for it is here.

Posted to common-issues@hadoop.apache.org by "Kihwal Lee (JIRA)" <ji...@apache.org> on 2013/09/19 23:46:56 UTC

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

    [ https://issues.apache.org/jira/browse/HADOOP-9981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13772365#comment-13772365 ] 

Kihwal Lee commented on HADOOP-9981:
------------------------------------

[~cmccabe], [~andrew.wang]: Any thoughts on how to improve it? How about extending NativeIO for this and keeping what we have today as fallback?
                
> 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().

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira