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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-5742) DatanodeCluster (mini cluster of DNs) fails to start
Date Thu, 09 Jan 2014 07:05:55 GMT

     [ https://issues.apache.org/jira/browse/HDFS-5742?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Arpit Agarwal updated HDFS-5742:
--------------------------------

    Attachment: HDFS-5742.03.patch

It looks like DataNodeCluster has not been used with Hadoop 2.0 in a while since I ran into
numerous issues. I think I got most of them and I can now bring up a simple test cluster with
a real NN and simulated DNs.

Attaching a patch with the following fixes:

# MiniDFSCluster now handles null configuration when starting simulated Datanodes.
# {{MiniDFSCluster#injectBlocks}} accepts an optional {{BlockPoolId}}. If none is supplied
then it tries to query it from the in-process NameNode i.e. existing behavior.
# DataNodeCluster accepts {{BlockPoolId}} on command line and passes it to {{injectBlocks}}
# DataNodeCluster optionally accepts {{SimulatedDnCapacities}} on the command line and passes
it to {{startDataNodes}}. If none is supplied then it uses the existing default from {{SimulatedFSDataset}}.
# DataNodeCluster must wait after starting the DNs and before injecting blocks to allow the
storage initialization to complete.
# BlockPoolId is printed when formatting NN.

> DatanodeCluster (mini cluster of DNs) fails to start
> ----------------------------------------------------
>
>                 Key: HDFS-5742
>                 URL: https://issues.apache.org/jira/browse/HDFS-5742
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: test
>    Affects Versions: 3.0.0
>            Reporter: Arpit Agarwal
>            Assignee: Arpit Agarwal
>            Priority: Minor
>         Attachments: HDFS-5742.01.patch, HDFS-5742.02.patch, HDFS-5742.03.patch
>
>
> DatanodeCluster fails to start with NPE in MiniDFSCluster.
> Looks like a simple bug in {{MiniDFSCluster#determineDfsBaseDir}} - missing check for
null configuration.



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