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From "Edward Capriolo (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5670) Hadoop configurations should be read from a distributed system
Date Wed, 12 May 2010 20:25:07 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12866717#action_12866717
] 

Edward Capriolo commented on HADOOP-5670:
-----------------------------------------

I think we are thinking along the same lines. I and I understand why you did and it that way
but I wanted to chat about it.

{noformat}
hadoopTaskTracker
commonname: string
hostname: multi-string
mapred.job.tracker: string
mapred.local.dir: multi-string
mapred.tasktracker.map.tasks.maximum: integer
mapred.tasktracker.reduce.tasks.maximum: integer
{noformat}

Doing this will cause you to have your LDAP schema generated from your hadoop configuration.
This is great because we can ensure type checking of the parameters but bad in a couple ways.

* we can not deal with non hadoop parameters (which should not be in the configuration but
could be)
* it will be a very intricate and large and we have to track new changes

Have your considered an alternate like this? 

{noformat}
commonname: string
hostname: multi-string
HadoopPropertyName: string
hadoopPropertyValue: multi-string
{noformat}

Yes, this is overly generic way is bad for several reasons, but I live it. Mostly because
right now the current configuration is an XML file. It has no XSD schema, hadoop does the
validity checking. What do you think? 


> Hadoop configurations should be read from a distributed system
> --------------------------------------------------------------
>
>                 Key: HADOOP-5670
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5670
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: conf
>            Reporter: Allen Wittenauer
>
> Rather than distributing the hadoop configuration files to every data node, compute node,
etc, Hadoop should be able to read configuration information (dynamically!) from LDAP, ZooKeeper,
whatever.

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