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Please keep the discussion on the mailing list rather than commenting on the wiki (wiki discussions get unwieldy fast).
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Currently, AdaptiveBatchScheduler does not support jobs with PIPELINED data exchanges. As a result, speculative execution does not support PIPELINED data exchanges either. Requiring all data exchanges to be BLOCKING also simplifies things, because each ExecutionVertex is an individual pipelined region in this case and can have individual speculations. Otherwise multiple ExecutionVertex from one pipelined region need to do speculative execution together.
This also means that
Speculative execution of sources and sinks are disabled by default
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