Ability to re-configure hadoop daemons online
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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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