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https://issues.apache.org/jira/browse/FLUME-992?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13263341#comment-13263341
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Hari Shreedharan commented on FLUME-992:
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Implemented as part of FLUME-1052.
> Create configuration stubs for sources, channels, sinks etc
> -----------------------------------------------------------
>
> Key: FLUME-992
> URL: https://issues.apache.org/jira/browse/FLUME-992
> Project: Flume
> Issue Type: Sub-task
> Affects Versions: v1.0.0
> Reporter: Hari Shreedharan
> Assignee: Hari Shreedharan
> Fix For: v1.2.0
>
> Original Estimate: 0h
> Remaining Estimate: 0h
>
> 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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