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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
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Hadoop QA commented on HDFS-1127:
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-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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