[jira] [Created] (FLUME-1941) Support defaults or inheritance in configs

["Mike Percy (JIRA)" <ji...@apache.org>]

Mike Percy created FLUME-1941:
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             Summary: Support defaults or inheritance in configs
                 Key: FLUME-1941
                 URL: https://issues.apache.org/jira/browse/FLUME-1941
             Project: Flume
          Issue Type: New Feature
          Components: Configuration
            Reporter: Mike Percy
             Fix For: v1.4.0


Proposal to support defaults or inheritance in configs.

The idea is to create a "prototypal" component config, such as a source or sink, which is not necessarily instantiated but is used to avoid repetitive configurations when creating multiple components of the same type. A great example of this is users who define 5 HDFS sinks to increase write parallelism, but they each contain many of the same configuration parameters and differ only in their name and path.

Basic idea:

{noformat}
agent.sinks.sink-proto-1.type = my-sink
agent.sinks.sink-proto-1.path = /var/log/foo/bar
agent.sinks.sink-proto-1.serializer = MySerializer$Builder
agent.sinks.sink-proto-1.credentials = mpercy

agent.sinks.sink-1.__prototype__ = sink-proto-1
agent.sinks.sink-1.path = /var/log/baz/blam

agent.sinks.sink-2.__prototype__ = sink-proto-1
agent.sinks.sink-2.path = /var/log/glerp/bazinga
{noformat}


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