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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5670) Hadoop configurations should be read from a distributed system
Date Tue, 16 Feb 2010 16:27:28 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12834293#action_12834293
] 

Allen Wittenauer commented on HADOOP-5670:
------------------------------------------

Small (I'd say tiny) grids that can get away with using NFS is not the target audience here.

Besides being a SPOF, for large installations having your entire grid and your clients mounting
the same fs is likely impossible due to firewall restrictions.   Using a distributed system
such as LDAP or ZK or whatever means you also have a higher chance of replicating configs
across firewall boundaries in a secure fashion.  

Also, if Hadoop is deployed to optimize certain features, chances are very very high that
a site is going to have multiple configs for the same grid.  For example, removing certain
non-client related options out of mapred-site.xml or specifically tuning the HDFS audit log.

> 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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