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https://issues.apache.org/jira/browse/HADOOP-10353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13915513#comment-13915513
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Tudor Scurtu commented on HADOOP-10353:
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Thank you too!
> 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: 2.3.0
> Reporter: Tudor Scurtu
> Assignee: Tudor Scurtu
> Labels: race-condition
> Fix For: 3.0.0, 2.4.0
>
> Attachments: HADOOP-10353.patch, HADOOP-10353.v2.patch
>
>
> 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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