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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-6639) FileSystem.get(..) may be blocked for a long time
Date Wed, 17 Mar 2010 22:59:27 GMT
FileSystem.get(..) may be blocked for a long time
-------------------------------------------------

                 Key: HADOOP-6639
                 URL: https://issues.apache.org/jira/browse/HADOOP-6639
             Project: Hadoop Common
          Issue Type: Improvement
          Components: filecache
            Reporter: Tsz Wo (Nicholas), SZE


When FileSystem cache is enabled, FileSystem.get(..) will call FileSystem.Cache.get(..), which
is a synchronized method.  If the lookup fails, a new instance will be initialized.   Depends
on the FileSystem subclass implementation, the initialization may take a long time.  In such
case, the FileSystem.Cache lock will be hold and all calls to FileSystem.get(..) by other
threads will be blocked for a long time.

In particular, the DistributedFileSystem initialization may take a long time since there are
retries.  It is even worst if the socket timeout is set to a large value.

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