CLONE - Create configuration stubs for sources, channels, sinks etc
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Key: FLUME-1053
URL: https://issues.apache.org/jira/browse/FLUME-1053
Project: Flume
Issue Type: Sub-task
Affects Versions: v1.0.0
Reporter: Hari Shreedharan
Assignee: Hari Shreedharan
Fix For: v1.2.0
Currently the configuration of each component sits deep inside the component
themselves. There is no way to verify if a configuration is valid before run
time. In most systems like Flume, it is likely that these confs will be
deployed from one single host, on to the machines where flume agents are
running. Only when each agent starts, invalid confs are identified because the
Agents would terminate by throwing exceptions. This is a first attempt to make
a component-aware configuration system which is independent of the Flume, and
does not require the Flume jar to be installed. Each component needs a
configuration manager, which configures the components.
Provide abstract Configuration stubs for each component type, sources,
channels, sinks, selectors etc, which are in the new package, independent on
ng-core. Now for each of the channels extend the abstract class and check the
config properties for each of the required parameters for that component, for
example: MultiplexingChannelSelectorConfigurator would look for default channel
etc. If a particular component does not have a configuration class then let the
current mechanism continue.
This will require implementation for each component, but it should not be too
complex. One additional advantage we get from this is that we can separate out
the config validation from the components into these stubs, but we will still
need to read the values out of the Context as we do currently(else we end up
making the configuration dependent on flume-ng-core itself which we wanted to
avoid).
A problem with this is making a change to the configuration would require
changes in the configuration classes and in the components also(where the
configuration is read and the component is actually configured). I could not
figure out a way of avoiding this.
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