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Date: Tue, 4 May 2010 17:15:08 -0400 (EDT)
From: "Hadoop QA (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Commented: (HDFS-1127) Improve the speed of FileSystem
 object creation
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    [ https://issues.apache.org/jira/browse/HDFS-1127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12864001#action_12864001 ] 

Hadoop QA commented on HDFS-1127:
---------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12443619/HDFS-1127.1.patch
  against trunk revision 939918.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 3 new or modified tests.

    -1 patch.  The patch command could not apply the patch.

Console output: http://hudson.zones.apache.org/hudson/job/Hdfs-Patch-h5.grid.sp2.yahoo.net/342/console

This message is automatically generated.

> Improve the speed of FileSystem object creation
> -----------------------------------------------
>
>                 Key: HDFS-1127
>                 URL: https://issues.apache.org/jira/browse/HDFS-1127
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 0.20.1, 0.20.2
>            Reporter: Zheng Shao
>            Assignee: Zheng Shao
>         Attachments: HDFS-1127.1.patch
>
>
> It takes a long time to create a lot of {{DistributedFileSystem}} object via {{FileSystem.create}} or {{FileSystem.createNewInstance}} function.
> In our experience with scribe-hdfs, it can take up to 2 minutes for 100 such calls from each node of a cluster of 40 nodes.
> The reason for the delay is mainly because of the lock on the CACHE object. We should release the lock while creating new FileSystem objects.

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