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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1127) Improve the speed of FileSystem object creation
Date Tue, 04 May 2010 04:08:56 GMT
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: 0.20.2, 0.20.1
            Reporter: Zheng Shao
            Assignee: Zheng Shao


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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