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From "Tom White (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5670) Hadoop configurations should be read from a distributed system
Date Fri, 17 Apr 2009 15:30:14 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12700209#action_12700209
] 

Tom White commented on HADOOP-5670:
-----------------------------------

ZK uses Java properties files, so it has no dependencies on Hadoop Core configuration.

The bootstrapping problem is that FileSystem relies on a Configuration object having loaded
its resources. So to get a Configuration to load from a FileSystem won't work, the way things
stand (see Configuration#loadResource). (It's possible that the reason for this code has gone
away, or at least lessened, following the recent split of configurations into core, hdfs and
mapred - it might be possible to bootstrap from the core config.) There's no inherent reason,
though, why a Configuration couldn't load its resources from HDFS or a ZK-backed FileSystem.
We just need to avoid a system loading resources from itself.



> Hadoop configurations should be read from a distributed system
> --------------------------------------------------------------
>
>                 Key: HADOOP-5670
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5670
>             Project: Hadoop Core
>          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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