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Posted to dev@rocketmq.apache.org by GitBox <gi...@apache.org> on 2022/07/05 10:51:35 UTC
[GitHub] [rocketmq] 15712852007 opened a new issue, #4561: UpdateTopicRouteInfoFromNameServer method in the concurrent lack of detection
15712852007 opened a new issue, #4561:
URL: https://github.com/apache/rocketmq/issues/4561
<img width="1132" alt="WechatIMG4508" src="https://user-images.githubusercontent.com/41977714/177307478-bbcf6898-ea9c-44ff-8848-c21e15418717.png">
问题：
updateTopicRouteInfoFromNameServer在某些场景下lockNamesrv代码块的内部缺少校验，可能会导致RemotingTooMuchRequestException("sendDefaultImpl call timeout")异常。
描述：
生产者发送消息时，会通过tryToFindTopicPublishInfo获取路由信息，如果没有缓存或没有messageQueue时会调用updateTopicRouteInfoFromNameServer向nameServer查询该topic的路由信息，在此方法内部有一个nameServer锁，这里极端情况下会出现一些问题，如果在同一时刻有很多个线程排队取lockNamesrv锁，假如前面的线程已通过nameServer拉取到路由信息了，在释放锁之后，后续的线程是没有必要重复与nameServer数据交互的，在网络不好等情况下很可能造成后面排队的线程超时(默认值3s)，然后抛throw new RemotingTooMuchRequestException("sendDefaultImpl call timeout")异常。举个较为极端的例子：100个线程使用同一个producer，大家都第一次发送某个topic的消息。
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[GitHub] [rocketmq] github-actions[bot] commented on issue #4561: UpdateTopicRouteInfoFromNameServer method in the concurrent lack of detection
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on issue #4561:
URL: https://github.com/apache/rocketmq/issues/4561#issuecomment-1629901309
This issue was closed because it has been inactive for 3 days since being marked as stale.
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[GitHub] [rocketmq] github-actions[bot] commented on issue #4561: UpdateTopicRouteInfoFromNameServer method in the concurrent lack of detection
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on issue #4561:
URL: https://github.com/apache/rocketmq/issues/4561#issuecomment-1626377103
This issue is stale because it has been open for 365 days with no activity. It will be closed in 3 days if no further activity occurs.
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[GitHub] [rocketmq] guyinyou commented on issue #4561: UpdateTopicRouteInfoFromNameServer method in the concurrent lack of detection
Posted by GitBox <gi...@apache.org>.
guyinyou commented on issue #4561:
URL: https://github.com/apache/rocketmq/issues/4561#issuecomment-1176984886
This is a great issue, looking forward to optimizing it
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[GitHub] [rocketmq] github-actions[bot] closed issue #4561: UpdateTopicRouteInfoFromNameServer method in the concurrent lack of detection
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] closed issue #4561: UpdateTopicRouteInfoFromNameServer method in the concurrent lack of detection
URL: https://github.com/apache/rocketmq/issues/4561
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