HostsFileReader does not properly implement concurrency support
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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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