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From "Eli Collins (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-891) DataNode no longer needs to check for dfs.network.script
Date Thu, 19 Apr 2012 01:12:40 GMT

     [ https://issues.apache.org/jira/browse/HDFS-891?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Eli Collins updated HDFS-891:

          Resolution: Fixed
       Fix Version/s: 2.0.0
    Target Version/s:   (was: 2.0.0)
        Hadoop Flags: Reviewed
              Status: Resolved  (was: Patch Available)

New jenkins run is clean. No new test is necessary since this just removes the old check.
 I've committed this and merged to branch-2. Thanks Steve and Harsh!
> DataNode no longer needs to check for dfs.network.script
> --------------------------------------------------------
>                 Key: HDFS-891
>                 URL: https://issues.apache.org/jira/browse/HDFS-891
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node
>    Affects Versions: 0.23.0
>            Reporter: Steve Loughran
>            Assignee: Harsh J
>            Priority: Minor
>             Fix For: 2.0.0
>         Attachments: HDFS-891.patch, hdfs-891.txt
> Looking at the code for {{DataNode.instantiateDataNode())} , I see that it calls {{system.exit(-1)}}
if it is not happy with the configuration
> {code}
>     if (conf.get("dfs.network.script") != null) {
>       LOG.error("This configuration for rack identification is not supported" +
>           " anymore. RackID resolution is handled by the NameNode.");
>       System.exit(-1);
>     }
> {code}
> This is excessive. It should throw an exception and let whoever called the method decide
how to handle it. The {{DataNode.main()}} method will log the exception and exit with a -1
value, but other callers (such as anything using {{MiniDFSCluster}} will now see a meaningful
message rather than some Junit "tests exited without completing" warning. 
> Easy to write a test for the correct behaviour: start a {{MiniDFSCluster}} with this
configuration set, see what happens.

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