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From "Tudor Scurtu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-10353) FsUrlStreamHandlerFactory is not thread safe
Date Thu, 20 Feb 2014 18:43:24 GMT
Tudor Scurtu created HADOOP-10353:
-------------------------------------

             Summary: FsUrlStreamHandlerFactory is not thread safe
                 Key: HADOOP-10353
                 URL: https://issues.apache.org/jira/browse/HADOOP-10353
             Project: Hadoop Common
          Issue Type: Bug
          Components: fs
    Affects Versions: 3.0.0
            Reporter: Tudor Scurtu
             Fix For: 3.0.0


The {{FsUrlStreamHandlerFactory}} class uses a plain {{HashMap}} for caching.

When the number of inserted values exceeds the the map's load threshold, it triggers a rehash.
During this time, a different thread that performs a get operation on a previously inserted
key can obtain a null value instead of the actual value associated with that key.

The result is a NPE potentially being thrown when calling {{FsUrlStreamHandlerFactory#createURLStreamHandler(String
protocol)}} concurrently.



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