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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-6078) Ability to re-configure hadoop daemons online
Date Thu, 18 Jun 2009 08:20:07 GMT
Ability to re-configure hadoop daemons online
---------------------------------------------

                 Key: HADOOP-6078
                 URL: https://issues.apache.org/jira/browse/HADOOP-6078
             Project: Hadoop Core
          Issue Type: New Feature
          Components: mapred
            Reporter: Amar Kamat


Example : 
Like we have _bin hadoop mradmin -refreshNodes_ we should also have _bin hadoop mradmin -reconfigure_
which re-configures mr while the cluster is online. Few parameters like job-expiry-interval
etc can be changed in this way without having to restart the whole cluster. 

Master, once reconfigured, can ask the slaves to reconfigure (reload its config) from a well
defined location on hdfs or via heartbeat. 

We can have some whitelisted configs that have _reloadable_ property. 

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