[jira] [Created] (APEXCORE-581) Delivery of Custom Control Tuples

["David Yan (JIRA)" <ji...@apache.org>]

David Yan created APEXCORE-581:
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             Summary: Delivery of Custom Control Tuples
                 Key: APEXCORE-581
                 URL: https://issues.apache.org/jira/browse/APEXCORE-581
             Project: Apache Apex Core
          Issue Type: Sub-task
            Reporter: David Yan


This will involve an additional MessageType to represent a custom control tuple. 
We probably need to have a data structure (possibly a LinkedHashMap) per streaming window that stores the control tuple in the buffer server.

The behavior should be as follow:

- The control tuples should only be sent to downstream at streaming window boundaries
- The control tuples should be sent to all partitions downstream
- The control tuples should be sent in the same order of arrival.
- Within a streaming window, do not send the same control tuple twice, even if the same control tuple is received multiple times within that window. This is possible if the operator has two input ports. (The LinkedHashMap should be easily able to do ensure both order and uniqueness.)
- The delivery of control tuples needs to stop at DelayOperator. 
- When a streaming window is committed, remove the associated LinkedHashMap that belong to windows with IDs that are less than the committed window
- It's safe to assume the control tuples are rare enough and can fit in memory




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