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Posted to dev@eventmesh.apache.org by GitBox <gi...@apache.org> on 2022/02/09 21:15:12 UTC
[GitHub] [incubator-eventmesh] jinrongluo edited a comment on pull request #723: [Issue #718] update Grpc Message Model name to SimpleMessage
jinrongluo edited a comment on pull request #723:
URL: https://github.com/apache/incubator-eventmesh/pull/723#issuecomment-1034198696
> I run the `AsyncPublishInstance` and `EventmeshAsyncSubscribe` under the `grpc` module, got following error:
>
> * Received Server side error: INTERNAL: gRPC frame header malformed: reserved bits not zero.
> 
>
> After got this error, the client has been shutted down and only got one message, but the topic offset has been updated to 5, this phenomenon is reasonable ? 
>
> this error is not inevitable, please take a look, thanks. @jinrongluo
Thanks @xwm1992 The root cause of this issue is that Grpc StreamObserver is not thread safe. The Java doc is here:
https://grpc.github.io/grpc-java/javadoc/io/grpc/stub/StreamObserver.html
```
Since individual StreamObservers are not thread-safe, if multiple threads will be writing to a StreamObserver concurrently, the application must synchronize calls.
```
The fix is in this commit - https://github.com/apache/incubator-eventmesh/pull/723/commits/48ab8d36e2fafe959fe4db27fc6d644457dd55e6
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