THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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(6)executionIndex2RunningTimespan is defined as the running time of the original execution in each ExecutionVertex.
Web UI
If we don't modify the code of web UI, when the speculative execution runs faster than the original execution, the web UI will show that this task has been cancelled. But the result of the batch job is correct.
More discussion is needed to decide whether the web UI needs to be modified.
Limitations
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