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From "Jakob Homan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-5258) Provide dfsadmin functionality to report on namenode's view of network topology
Date Thu, 19 Feb 2009 21:06:01 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-5258?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jakob Homan updated HADOOP-5258:
--------------------------------

    Attachment: HADOOP-5258.patch

Patch:
   * Implements new dfsAdmin command -printTopology that prints out a tree of the racks and
their attached nodes:
{noformat}
Rack: /default-rack
   1.4.7.10:54726 (host1.domain.com)
   2.5.8.11:59142 (host2.domain.com)
   3.6.9.12:56643 (host3.domain.com)
   etc...
{noformat}
   This will allow the user to see the topology as the namenode currently sees it.
   * Provides a unit test for this new command.  To test this I had to create a new type of
test comparator in TestCLI, which is also included.
   * Moves a helper function that attempts to resolve an ip into a hostname from DatanoderReport
to the utils class, as it was needed again for this patch.

> Provide dfsadmin functionality to report on namenode's view of network topology
> -------------------------------------------------------------------------------
>
>                 Key: HADOOP-5258
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5258
>             Project: Hadoop Core
>          Issue Type: New Feature
>            Reporter: Jakob Homan
>            Assignee: Jakob Homan
>         Attachments: HADOOP-5258.patch
>
>
> As discussed in HADOOP-4954, it would be useful to be able to query the namenode to its
current view on the network topology of racks and datanodes.  This would allow ops to compare
what the namenode sees with what they expect it to see.  

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