kezhenxu94 commented on issue #2714: [WIP]Seata Agent URL: https://github.com/apache/skywalking/pull/2714#issuecomment-498004526 > @kezhenxu94 The rollback trace is not very clear to me. Could you explain more? In your scenario, which service triggers the rollback? I expect you could show the trace, one service fails, then TM/TC works together to make other services rollback too. yes I'll elaborate more on this, in this example: ```java @Override @GlobalTransactional(timeoutMills = 300000, name = "dubbo-demo-tx") public void purchase(String userId, String commodityCode, int orderCount) { LOGGER.info("purchase begin ... xid: " + RootContext.getXID()); storageService.deduct(commodityCode, orderCount); if (orderCount % 2 == 0) { throw new IllegalArgumentException("xxx"); } } ``` - the `business.purchase` throws exception after calling `storageService.deduct` but before finished the global transaction - the exception triggers the `TransactionManager` (TM) to request (from TC) a rollback - the `TransactionCoordinator` (TC) requests all the `ResourceManager`s to roll back below the highlighted span is where the `RM` does the rollback operation (by doing some compensative operations) as the `TC` demanded  
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