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https://issues.apache.org/jira/browse/HDFS-3446?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arun C Murthy closed HDFS-3446.
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> HostsFileReader silently ignores bad includes/excludes
> ------------------------------------------------------
>
> Key: HDFS-3446
> URL: https://issues.apache.org/jira/browse/HDFS-3446
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: name-node
> Affects Versions: 1.0.0, 2.0.0-alpha
> Reporter: Matthew Jacobs
> Assignee: Matthew Jacobs
> Fix For: 2.0.2-alpha
>
> Attachments: hdfs-3446.txt, hdfs-3446.txt
>
>
> The HostsFileReader silently fails if the includes or excludes files do
> not exist or are not readable. The current behavior is to overwrite the
> existing set of hosts or excluded hosts, regardless of whether or not
> the includes/excludes file exists.
> This behavior was introduced in HADOOP-5643 to support updating the job
> tracker's node lists. The HostsFileReader is no longer used by the job
> tracker. If this behavior was intentional, it no longer seems necessary
> for any reason. The HostsFileReader is still used by NodeListManager as
> well as the DatanodeManager, and in both cases, throwing an exception
> when the include/exclude files aren't found/readable is desirable.
> We should validate the given includes and excludes files before using
> them.
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