maxconnectionage grpcmaxconnectionage grpc

Package keepalive defines configurable parameters for point-to-point The following stack trace shows that the super.channelInactive() call closes the HTTP2 base decoder and it ensures that all streams are properly closed. Current visitors New profile posts Search profile posts. Is there any way to replicate this behavior with the current akka-grpc API, or any plans to provide such a feature? Have a question about this project? I tested v1.22.0, and there were still many "rpc error: code = Unavailable desc = the connection is draining". I used sudo tcpdump -i lo -B 10000 tcp port 50051 -w out.pcap -W 5 -C 20 to capture, and mergecap to concat files if necessary. Is there any way to replicate this behavior with the current akka-grpc API. You signed in with another tab or window. When a connection exceeds the MAX_CONNECTION_AGE, the server sends GOAWAY and terminates it. To see all available qualifiers, see our documentation. Apart from that, gRPC documentation provides Server-side Connection Management proposal and we gave it a try. Netflixs concurrency limits interceptor is an interesting solution to managing server concurrency. An RPC will wait if any connection attempts are in progress, but if the connections are in a known-bad state then the RPC can fail immediately. server-side. max_connection_idle: 0s # MaxConnectionAge is a duration for the maximum amount of time a # connection may exist before it will be closed by sending a GoAway. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Yeah, that makes sense. # # This option is optional. Based on data we've collected in the past, a channel will take up on the order of 40 KB of memory on the server side. Connection timeouts and RPC timeouts are separate. I was also looking for something like that. After debugging a little more, I found the following timeline: This kind of issue was already described in some HTTP2 implementations. The text was updated successfully, but these errors were encountered: What's the status of gRPC resource constraints? This poses a problem in terms of service discovery and client-side load balancing - since address resolution only happens in the dialer's DialContext, this leaves no chance for the client to re-resolve the target address since the same connection is constantly reused without ever "re-dialing". If you want to dynamically control how much memory gets used (and, thus . ejona-trial1.pcap.gz This is causing OOM as a single client can create multiple connections in a burt. I think the most common way to approach this currently is to use DNS to discover the individual IP's of the target services, and use the 'round-robin' loadbalancing to balance the load over them. Usage example Server and client channel setup I tried to enable MaxConnectionAge on a C++ server and call from a Go client. By clicking Sign up for GitHub, you agree to our terms of service and Kubernetes internal load balancers do not balance RPCs but TCP connections. gRPC tracing led us to reduce our overall response time by 50 percent So I got one question, during `MaxConnectionAgeGrace` period, what happen if there are new requests? and the client kept running without any issues. To move the clientStream.transportReportStatus() call makes no difference and there is a RST packet. Connect and share knowledge within a single location that is structured and easy to search. GRPC_MAX_CONNECTION_AGE forces clients to reconnect, thus giving them the opportunity to reach a different backend. Yes, I set both age and grace to 60s and each rpc finishes within a few seconds, but the unavailable errors appear a lot of times. These configure how the client will actively probe to notice when a // MaxConnectionIdle is a duration for the amount of time after which an, // idle connection would be closed by sending a GoAway. Granted, that isn't dynamic so you can't allow a single client to burst higher if other clients aren't using resources. A # random jitter of +/-10% will be added to MaxConnectionAge to spread out # connection storms. Share Improve this answer Follow In any case, this RPC seems like it was accepted by the server because we use a different error message for RPCs rejected by GOAWAY (generally mention "abrupt" goaway). This is also done transparently for the application code (https://github.com/grpc/proposal/blob/master/A9-server-side-conn-mgt.md; https://github.com/grpc/proposal/blob/master/A6-client-retries.md#transparent-retries). But I know Java isn't implementing that; it's more of hard-coded timeouts. I agree that just moving the call to super.channelInactive() is not a proper fix. Conclusions from title-drafting and question-content assistance experiments How difficult was it to spoof the sender of a telegram in 1890-1920's in USA? The text was updated successfully, but these errors were encountered: 16 peterzeller, dankinder, alikhil, raidancampbell, grzegorzlyczba, gorcz, Prots, awnumar, KyleKotowick, xenonn, and 6 more reacted with thumbs up emoji privacy statement. This is because there was a hidden restriction for ping interval, in the proposal it said within MinTime , the server can only receive at max 3 pings. grpc.KeepaliveParams(keepalive.ServerParameters{MaxConnectionAge: time.Second * 30, // THIS one does the trick MaxConnectionAgeGrace: time.Second * 10,}) How it behaves in the real world: settings can result in closing of connection. Have a question about this project? // streams, server will send GOAWAY and close the connection. For go client: GRPC_GO_LOG_VERBOSITY_LEVEL=99 GRPC_GO_LOG_SEVERITY_LEVEL=info, For C++ server: try GRPC_VERBOSITY=DEBUG GRPC_TRACE=server_channel. What would naval warfare look like if Dreadnaughts never came to be? This is an excerpt of the keepalive options that are set on a gRPC code channel. In that case this is most probably an issue. Contributions there are definitely welcome, see akka/akka-http#3226 . If MaxConnectionAgeGrace passes, then this would be expected. Server server = NettyServerBuilder. It all started with a question I asked our senior software engineer:Forget the speed of communication. We can go a long way via throttling inside our application, but there is still the risk that memory usage at the OS/connection layer will push us over the limit. integrate the discovery and the load balancing so that when new nodes are discovered, new connections are made accordingly. // The current default value is 5 minutes. You can get a rough view with https://github.com/grpc/grpc/blob/master/doc/connectivity-semantics-and-api.md . But gRPC uses HTTP 2, where a single, long-lived connection is kept between an instance of the client and the server and all requests are multiplexed within it. @ejona86 You are right. I've validated that all grpc call finished correctly. Can a creature that "loses indestructible until end of turn" gain indestructible later that turn? Sign in We have a PR out which delays the allocation of resources using semaphore here. We can even see no incoming traffic on the new pods. allow configuring load balancing so an appropriate number of connections is made to a cluster ip service. Already on GitHub? // After a duration of this time if the client doesn't see any activity it. Remember my 3 constraints? The text was updated successfully, but these errors were encountered: Similar to #23427 which offers a work around (hack). The first two numbers are i and j, showing loop iteration. It reduces the overhead of connection management. Rafael Eyng grpc, load balancing, golang, kubernetes. In short, L4 load balancers balance at the connection level, which for HTTP 1.1 normally works just fine. By clicking Sign up for GitHub, you agree to our terms of service and There are internal gRPC races, but those should be handled by transparent retry. In conclude, we know that the previous connection will still open but not accepting new request, after MaxAge it will refresh to a new connection and plotting connection to the new connection instead. So bi-di client <-----------> ALB <--------> server In-case of any failure of connection, clients re-connects to us as we want to keep a bi-di channel open & active. Luckily, it has an easy-to-implement workaround. I'm wondering if this is caused by a TCP RST getting received before the trailers have been processed. Go through documentation, tune it up, experiment, and get the most from what you already have. MaxConnectionAge time.Duration // The current default value is infinity. You can find more information on how Kubernetes balances TCP connections in my other blog post.Level 4 load balancers are common due to their simplicity because they are protocol agnostic. I meant to say: Client sends requests, to each request server sends response with large response message size (4 MB). Is it really better for you to develop communication in gRPC instead of REST? The answer I didnt want to get came immediately: Absolutely yes.. Oh, right, we are extending that HTTP/2 base class, so the call flow becomes complicated. And in the client in http2Client.reader(), the call to t.framer.fr.ReadFrame returns EOF, and since this is not of type http2.StreamError we call Close() on the transport, which closes all active streams with ErrConnClosing, At this point, I don't know enough to say whether this is a bug or is WAI :-). I0502 14:33:32.238395 58768 pickfirst.go:73] pickfirstBalancer: HandleSubConnStateChange: 0xc0007e5360, CONNECTING GitHub grpc / grpc-go Public Notifications Fork 4.1k Star 18.5k Code Issues 121 Pull requests 9 Actions Projects 1 Security Insights What kind of logs would help to investigate the problem? hi @dfawley @wjywbs, i set MaxConnectionAge for long live grpc stream server recently, then a lots of grpc log "transport is closing", so i found this issue and write a test case to replicate the problem. the connection establishment. We run this in a high traffic scenario since some years without an issue that we could observe (does not mean that it does not exist in practice). # # This option is optional. Most of them are quite straightforward and easy to understand, but some configuration is still a bit ambiguous for the server side setting. Defaults to two hours. For instance I have a server that accepts streaming rpcs, but, a single user could spawn multiple connections and kill one of my tasks (due to excessive resource usage and also too many active connections, even ones that don't have an active stream). maxConnectionAge (MAX_CONNECTION_AGE, TimeUnit. Could you please help me with this. To see all available qualifiers, see our documentation. The gRPC error model is based on status codes, so it was easy to map them to HTTP codes. Clients are scaled up again, but the load is still not balanced evenly. I am new to grpc. update. We have migrated some of these integrations to gRPC mostly because of the overhead of REST we wanted to get rid of. All this leads to lost messages. Failed connections cause UNAVAILABLE on the client. https://github.com/grpc/grpc-java/blob/master/netty/src/main/java/io/grpc/netty/NettyClientHandler.java#L462. You would use GRPC_ARG_MAX_CONNECTION_AGE_MS, defined in grpc_types.h: /** Maximum time that a channel may exist. Ideally in my opinion, when the server hits too many connections, failed connection attempts will return RESOURCE_EXHAUSTED to the client. We read every piece of feedback, and take your input very seriously. @laurovenancio, I'm suspicious of that change. It wasn't obvious to me at first how to benefit from this, but our co-workers who work on Tsuru (our PaaS that works on top of Kubernetes) suggested using a Headless Service as a way of obtaining the addresses of the Pods behind our actual Service. http://stackoverflow.com/questions/37338038/how-to-configure-maximum-number-of-simultaneous-connections-in-grpc. I looked at the logs but I don't see any server side logs. Although looking at ejona-trial1.pcap.gz above, it doesn't entirely fit as the client wasn't sending HTTP/2 frames. This test rule contains the boilerplate code shown below. Looking for story about robots replacing actors. All configurations trigger the exceptions eventually. How does Genesis 22:17 "the stars of heavens"tie to Rev. Python. you may need use -count 100 because sometimes it test pass sometimes it test fail. What we know about gRPC DNS rediscovery is that it starts only if the old connection breaks or ends with GOAWAY signal. Error handling Generated clients only have request logic, so we had to implement our own error handling. Can you try with this change and let us know if it resolves your problems? I want to know if this feature is planned or resolved, and what is the reason why it is not currently supported. The text was updated successfully, but these errors were encountered: Can you turn on logging for the client and server? I think it would be great if (either based on grpc-java or akka-http) it would be possible to: On the server side we are already based on Akka HTTP, so possibly we could add something like (GRPC_)MAX_CONNECTION_AGE there - though it feels like solving this at the server side might be less elegant than doing it at the client side. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Eventually the client throws io.grpc.StatusException: UNAVAILABLE after receiving GOAWAY from the server.