opKey := operationKey{volumeName, podName, nodeName}
	exist, previousOpIndex := grm.isOperationExists(opKey)
	if exist && grm.operations[previousOpIndex].operationPending {
		return true
	}
	return false
}

// This is an internal function and caller should acquire and release the lock
func (grm *nestedPendingOperations) isOperationExists(key operationKey) (bool, int) {