[jira] [Created] (REEF-893) Different communication groups should use different threads to handle group comm messages

["Gyeongin Yu (JIRA)" <ji...@apache.org>]

Gyeongin Yu created REEF-893:
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             Summary: Different communication groups should use different threads to handle group comm messages
                 Key: REEF-893
                 URL: https://issues.apache.org/jira/browse/REEF-893
             Project: REEF
          Issue Type: Bug
          Components: REEF-IO
            Reporter: Gyeongin Yu


In {{GroupCommDriverImpl}}, the field {{groupCommMessageStage}} is a {{SingleThreadStage}} and we handle all group comm messages using this stage. This constraint is too strong; we should use different threads to handle group comm messages sent to different {{CommunicationGroups}}.

If the group comm message handling thread waits (for synchronization) and is never awaken while handling a message of one {{CommGroup}}, it will block messages intended for other {{CommGroups}}. This harms the independence between different {{CommGroups}}.



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