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[FLINK-2462] [streaming] Major cleanup of operator structure for exce…
…ption handling and code simplication - The exceptions are no longer logged by the operators themselves. Operators perform only cleanup in reaction to exceptions. Exceptions are reported only the the root Task object, which knows whether this is the first failure-causing exception (root cause), or is a subsequent exception, or whether the task was actually canceled already. In the later case, exceptions are ignored, because many cancellations lead to meaningless exceptions. - more exception in signatures, less wrapping where not needed - Core resource acquisition/release logic is in one streaming task, reducing code duplication - Guaranteed cleanup of output buffer and input buffer resources (formerly missed when other exceptions where encountered) - Fix mixup in instantiation of source contexts in the stream source task - Auto watermark generators correctly shut down their interval scheduler - Improve use of generics, got rid of many raw types This closes apache#1017
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