Tudor Scurtu created HADOOP-10353:
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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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