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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MAPREDUCE-442) Ability to re-configure hadoop daemons online
Date Tue, 22 Jul 2014 21:48:39 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-442?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Allen Wittenauer resolved MAPREDUCE-442.

    Resolution: Duplicate

I'm going to dupe this to HADOOP-7001, since it's closer to reality.  Other jiras tend to
point to it as well.

> Ability to re-configure hadoop daemons online
> ---------------------------------------------
>                 Key: MAPREDUCE-442
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-442
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>            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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