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From "Jakob Homan (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-5261) HostsFileReader does not properly implement concurrency support
Date Sat, 14 Feb 2009 03:51:00 GMT
HostsFileReader does not properly implement concurrency support

                 Key: HADOOP-5261
                 URL: https://issues.apache.org/jira/browse/HADOOP-5261
             Project: Hadoop Core
          Issue Type: Bug
            Reporter: Jakob Homan
            Assignee: Jakob Homan

As currently implemented, the class HostsFileReader does not properly allow concurrent access.

It maintains two Sets and manipulates them within synchronized fields, but provides accessor
methods that publish unsynchronized access to the sets' references (getHosts() and getExcludedHosts()).
 The sets are implemented as HashSets, which are not thread safe.  This can allow a method
to obtain a reference to a set that may be modified concurrently by the HostsFileReader.

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