Michael Guymon created CASSANDRA-4998:
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             Summary: Add hook for modifying configuration after cassandra.yaml 
is loaded
                 Key: CASSANDRA-4998
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4998
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Michael Guymon


When embedding Cassandra in an application, allow programmatic changes to 
Cassandra's config by using a hook to modify the configuration after the YAML 
is loaded. 

For this to work, a new YAML configuration needs to be added: 
after_load_hook_class. If defined, it would be the FQN of a class that 
implements IAfterLoadHook. When DatabaseDescriptor calls loadYAML(), before any 
processing of the Config happens, the after_load_hook_class is checked and 
called if exists. Then processing of the config happens as normal.



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