def rethrow(self):

        if self.exception:
            raise self.exception
Test case when UserOpManager cannot acquire lock.
dataset/ETHPy150Open binux/pyspider/pyspider/processor/processor.py/ProcessorResult.rethrow--crossover with--dataset/ETHPy150Open viewfinderco/viewfinder/backend/db/test/op_manager_test.py/OpManagerTestCase.testLockFailure