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From "Hemanth Yamijala (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3579) Support property groups in Hadoop configuration
Date Thu, 19 Jun 2008 06:47:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12606262#action_12606262

Hemanth Yamijala commented on HADOOP-3579:

In your example above, queue1 and queue2 are instances of queues, and user1 and user2 are
instances of users, right ? That is, they do not define a new group. So, I would describe
it as:

<group name="queues">
  <instance name="queue1" >
  <instance name="queue2" >
    <group name="users" >
      <instance name="stevel" />
      <instance name="julio" />

Do you see any concern with the above format to represent your example ?

bq. What is the difference between a one-level array of values and a child group? not much

I don't follow this. By 'array', it is implied they are values of the same type. So, they
are instances. A group on the other hand defines a new collection of properties. So, they
are different, no ? Can you give an example to clarify ?

> Support property groups in Hadoop configuration
> -----------------------------------------------
>                 Key: HADOOP-3579
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3579
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: conf
>            Reporter: Hemanth Yamijala
> Hadoop configuration is currently a list of key and value pairs. There are some use-cases
to support configuring groups of related properties. There could also be multiple instances
of such groups. The issue is for adding support for such configuration.

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