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