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Posted to commits@servicecomb.apache.org by GitBox <gi...@apache.org> on 2020/05/11 10:41:11 UTC
[GitHub] [servicecomb-pack] gjguanjie opened a new issue #658: saga使用问题，不一定是bug
gjguanjie opened a new issue #658:
URL: https://github.com/apache/servicecomb-pack/issues/658
使用https://hub.docker.com/r/coolbeevip/servicecomb-pack中 docker-compose.yaml 方式启动标准镜像只包含 Alpha 服务。 含状态机了。
客户端中引入，使用restTemplate方式
<dependency>
<groupId>org.apache.servicecomb.pack</groupId>
<artifactId>omega-spring-starter</artifactId>
</dependency>
<dependency>
<groupId>org.apache.servicecomb.pack</groupId>
<artifactId>omega-transport-resttemplate</artifactId>
</dependency>
测试如下 代码如下：
服务1：
@RestController
@RequestMapping("/saga")
public class SagaController {
private static final Logger LOGGER = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
@Resource
private RestTemplate template;
@GetMapping("/start")
@SagaStart
public void start() {
LOGGER.error("调服务");
template.postForObject("http://localhost:9001/service/test",null,String.class);
}
}
服务2：
@RestController
@RequestMapping("service")
public class SagaServiceController {
private static final Logger LOGGER = LoggerFactory.getLogger(MethodHandles.lookup().getClass());
@Resource
private SagaService sagaService;
@PostMapping("test")
public void test(){
sagaService.test();
}
}
@Service
public class SagaService {
private static final Logger LOGGER = LoggerFactory.getLogger(MethodHandles.lookup().getClass());
@Compensable(compensationMethod = "cancel")
public void test() {
int aa = 1;
LOGGER.error("测试方法");
int bb = 1/0;
}
public void cancel() {
LOGGER.error("Cancel方法");
}
}
当调用服务1接口http://localhost:9000/saga/start时，遇到服务2中报错，原则上，会调用cancel方法，但没有执行。
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[GitHub] [servicecomb-pack] gjguanjie commented on issue #658: saga使用问题，不一定是bug
Posted by GitBox <gi...@apache.org>.
gjguanjie commented on issue #658:
URL: https://github.com/apache/servicecomb-pack/issues/658#issuecomment-626669151
从原理上讲，应该与服务多与少没有关系吧？从架构上，或服务A作为入口，调用服务B时，B服务出错，服务B方法中使用@Compensable(compensationMethod = "cancel")，那应该就会执行Alpha反回调cancel.
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[GitHub] [servicecomb-pack] gjguanjie edited a comment on issue #658: saga使用问题，不一定是bug
Posted by GitBox <gi...@apache.org>.
gjguanjie edited a comment on issue #658:
URL: https://github.com/apache/servicecomb-pack/issues/658#issuecomment-626671111
https://servicecomb.apache.org/cn/docs/distributed-transaction-of-services-1 这文章上，也没有讲，服务多与少问题吧，
另我试了，服务A先调用服务B、再调用服务C，仅服务C出问题，会现调用cancel方法。如果服务B出问题。这时服务B不会调用cancel方法。因为状态那一块原码我没有再看。。。。
那么，我就不会知道，调用服务深度要多少（或服务多少）才能使用。
原理上讲，即使是服务A调用服务B这样简单的服务，至少也分布式事务。
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[GitHub] [servicecomb-pack] gjguanjie removed a comment on issue #658: saga使用问题，不一定是bug
Posted by GitBox <gi...@apache.org>.
gjguanjie removed a comment on issue #658:
URL: https://github.com/apache/servicecomb-pack/issues/658#issuecomment-626669151
从原理上讲，应该与服务多与少没有关系吧？从架构上，或服务A作为入口，调用服务B时，B服务出错，服务B方法中使用@Compensable(compensationMethod = "cancel")，那应该就会执行Alpha反回调cancel.
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[GitHub] [servicecomb-pack] gjguanjie commented on issue #658: saga使用问题，不一定是bug
Posted by GitBox <gi...@apache.org>.
gjguanjie commented on issue #658:
URL: https://github.com/apache/servicecomb-pack/issues/658#issuecomment-626671111
https://servicecomb.apache.org/cn/docs/distributed-transaction-of-services-1 这文章上，也没有讲，服务多与少问题吧，
另我试了，服务A调用服务B和服务C，仅服务C出问题，还是不出会现调用cancel方法。
那么，我就不会知道，调用服务深度要多少（或服务多少）才能使用。
原理上讲，即使是服务A调用服务B这样简单的服务，至少也分布式事务。
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[GitHub] [servicecomb-pack] gjguanjie edited a comment on issue #658: saga使用问题，不一定是bug
Posted by GitBox <gi...@apache.org>.
gjguanjie edited a comment on issue #658:
URL: https://github.com/apache/servicecomb-pack/issues/658#issuecomment-626671111
https://servicecomb.apache.org/cn/docs/distributed-transaction-of-services-1 这文章上，也没有讲，服务多与少问题吧，
另我试了，服务A调用服务B和服务C，仅服务C出问题，会现调用cancel方法。
那么，我就不会知道，调用服务深度要多少（或服务多少）才能使用。
原理上讲，即使是服务A调用服务B这样简单的服务，至少也分布式事务。
----------------------------------------------------------------
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[GitHub] [servicecomb-pack] WillemJiang commented on issue #658: saga使用问题，不一定是bug
Posted by GitBox <gi...@apache.org>.
WillemJiang commented on issue #658:
URL: https://github.com/apache/servicecomb-pack/issues/658#issuecomment-626657433
你这边调用的服务还是比较少，如果只是一个服务调用失败的，Saga， TCC都不会调用这个服务的恢复方法。 建议你可以看一下 https://servicecomb.apache.org/cn/docs/distributed-transaction-of-services-1 这篇文章。
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