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Date: Sat, 19 May 2012 00:08:02 +0000 (UTC)
From: "Matthew Jacobs (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Created] (HDFS-3446) HostsFileReader silently ignores bad
 includes/excludes
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Matthew Jacobs created HDFS-3446:
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             Summary: 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
            Reporter: Matthew Jacobs
            Assignee: Matthew Jacobs


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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