Craig McConomy created CASSANDRA-12624:
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Summary: Add cassandra.yaml overlay capabilities (can issue pull
request now)
Key: CASSANDRA-12624
URL: https://issues.apache.org/jira/browse/CASSANDRA-12624
Project: Cassandra
Issue Type: Improvement
Components: Configuration
Environment: OSX but should work on any OS.
Reporter: Craig McConomy
Priority: Minor
Fix For: 3.x
Adds a new file "conf/cassandra-overlay.yaml" that can contain any settings
found in cassandra.yaml. Any settings, if found, override whatever is found in
cassandra.yaml
A different overlay file can be specified using
-Dcassandra.config.overlay=your_file_name
Overlay processing can be disabled with -Dcassandra.config.overlay.disable=true
Rationale: When administering cassandra nodes, I have found it quite common to
want to distribute a common "golden" cassandra.yaml. This is challenging where
you have a configuration value or two that needs to be modified per node. In
this case, ops needs to know which lines of cassandra.yaml to ignore (because
it's the same on all nodes) so that they can focus on what's uniquely
configured for a particular node.
By specifying an additional overlay file, cassandra admins have the flexibility
to decide what is configured on a per-node basis, and can make it extremely
clear.
Source can be found in
https://github.com/cmcconomy/cassandra/tree/config-overlay
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