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https://issues.apache.org/jira/browse/HADOOP-5772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12706802#action_12706802
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Steve Loughran commented on HADOOP-5772:
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Incidentally, as I struggle to bring up a cluster where no machine knows their
hostname/IPAddr until they have opened their IPC and http ports, it would be
very good for the worker nodes -TT and DN- to be tweaked to reread the conf
file every time they try looking up the address:port of the master nodes. That
would allow the namenode and job tracker to restart on different hosts and have
all the workers bond to them once their configurations are updated.
> Implement a 'refreshable' configuration system with right access-controls etc.
> ------------------------------------------------------------------------------
>
> Key: HADOOP-5772
> URL: https://issues.apache.org/jira/browse/HADOOP-5772
> Project: Hadoop Core
> Issue Type: New Feature
> Components: conf
> Reporter: Arun C Murthy
>
> We have various bits and pieces of code to refresh certain configuration
> files, various components to restrict access to who can actually refresh the
> configs etc.
> I propose we start thinking about a simple system to support this as a
> first-class citizen in Hadoop Core...
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