Julien Nioche created NUTCH-1604:
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Summary: ProtocolFactory not thread-safe
Key: NUTCH-1604
URL: https://issues.apache.org/jira/browse/NUTCH-1604
Project: Nutch
Issue Type: Bug
Reporter: Julien Nioche
The method getProtocol() should be synchronized otherwise the Fetcher threads
can access it around the same time and query the cache before it's had a chance
of being populated properly. This would happen for a handful of calls until the
subsequent ones get the cache but this should be fixed nonetheless e.g. when we
want a guarantee that the same Protocol instance will be called for the same
fetching session.
The other Factor classes which use the same cache mechanism would suffer from
the same problem.
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