[jira] [Created] (CASSANDRA-12624) Add cassandra.yaml overlay capabilities (can issue pull request now)

["Craig McConomy (JIRA)" <ji...@apache.org>]

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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