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