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From "Jakob Homan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-5261) HostsFileReader does not properly implement concurrency support
Date Sat, 14 Feb 2009 03:54:59 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-5261?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jakob Homan updated HADOOP-5261:
--------------------------------

    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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