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https://issues.apache.org/jira/browse/HADOOP-5261?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jakob Homan updated HADOOP-5261:
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Status: Patch Available (was: Open)
Submitting patch.
> 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
> Attachments: HADOOP-5261.patch
>
>
> 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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