[jira] [Created] (HELIX-709) Prepare controller stages for async execution

["Hao Zhang (JIRA)" <ji...@apache.org>]

Hao Zhang created HELIX-709:
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             Summary: Prepare controller stages for async execution
                 Key: HELIX-709
                 URL: https://issues.apache.org/jira/browse/HELIX-709
             Project: Apache Helix
          Issue Type: Task
            Reporter: Hao Zhang


There are a couple of stages in helix controller that can be executed asynchronously, but each execution should be done in order. Currently for helix controller, we have a thread pool for un-ordered execution, but we also need one for ordered execution.

In this ticket should do the following:
1. Create a pool of configurable workers using DedupEventProcessor
2. Create AbstractAsyncBaseStage for those stages that can be executed asynchronously to share common code

AC:
Create AbstractAsyncBaseStage and DedupFIFOWorkerPool for async execution, pass all tests.



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