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Date: Mon, 23 Mar 2009 22:11:51 -0700 (PDT)
From: "Chris Douglas (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Updated: (HADOOP-5261) HostsFileReader does not properly
 implement concurrency support
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     [ https://issues.apache.org/jira/browse/HADOOP-5261?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chris Douglas updated HADOOP-5261:
----------------------------------

    Status: Open  (was: Patch Available)

> 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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