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Merge pull request #9168 from gyuho/grpc-doc

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Documentation: add TCP RST flag on stream close
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Gyuho Lee 2018-01-18 12:21:24 -08:00 committed by GitHub
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@ -102,6 +102,12 @@ To recover from the low space quota alarm:
2. [Defragment][maintenance-defragment] every etcd endpoint.
3. [Disarm][maintenance-disarm] the alarm.
### What does the etcd warning "etcdserver/api/v3rpc: transport: http2Server.HandleStreams failed to read frame: read tcp 127.0.0.1:2379->127.0.0.1:43020: read: connection reset by peer" mean?
This is gRPC-side warning when a server receives a TCP RST flag with client-side streams being prematurely closed. For example, a client closes its connection, while gRPC server has not yet processed all HTTP/2 frames in the TCP queue. Some data may have been lost in server side, but it is ok so long as client connection has already been closed.
Only [old versions of gRPC](https://github.com/grpc/grpc-go/issues/1362) log this. etcd [>=v3.2.13 by default log this with DEBUG level](https://github.com/coreos/etcd/pull/9080), thus only visible with `--debug` flag enabled.
## Performance
### How should I benchmark etcd?