maxconnectionage grpcmaxconnectionage grpc

The call will take 30s and with MaxAge (10s) + Grace (30s), the call should have enough time to process. This would be in line with the behavior of go-grpc which also enforces a MaxConnectionAge limit. No updates. settings can result in closing of connection. The following stack trace shows that the super.channelInactive() call closes the HTTP2 base decoder and it ensures that all streams are properly closed. A # random jitter of +/-10% will be added to MaxConnectionAge to spread out # connection storms. Getting io.grpc.StatusRuntimeException: UNAVAILABLE: HTTP/2 error code: NO_ERROR Receiv Ask Question Asked 7 months ago Modified 7 months ago Viewed 168 times 1 I am new to grpc. Since changing that was not an option at the moment, we took the approach of client-side balancing, which itself was hard to set up because the documentation was somewhat lacking. When does the io.grpc.StatusRuntimeException: UNAVAILABLE happen after the RPC is started? Netflixs concurrency limits interceptor is an interesting solution to managing server concurrency. The classes "HelloWorldServerTest" and "HelloWorldClientTest" (from "grpc-java/examples") demonstrate basic usage. On the client side, currently we're building on top of the grpc-java client, so anything that is possible there should be possible to expose in Akka gRPC. The client-side . Well occasionally send you account related emails. The client configuration only solves number 1. In this case your RPCs were allowed for about 4 to 5 seconds and that's beyond the 1 second window but I don't think that's an issue for you. // After having pinged for keepalive check, the client waits for a duration, // of Timeout and if no activity is seen even after that the connection is. 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. 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. Then we were able to reproduce using a minimal project with large response size on MacOS. Note that once 1 second has elapsed the server will only allow existing RPCs (that were started before the second elapsed) to finish. In this case your RPCs were allowed for about 4 to 5 seconds. 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: I looked at the logs but I don't see any server side logs. GRPC_MAX_CONNECTION_AGE forces clients to reconnect, thus giving them the opportunity to reach a different backend. liveness of the connection. Are there separate timeouts for connection establishment and the full request? By clicking Sign up for GitHub, you agree to our terms of service and How to configure `MAX_CONNECTION_AGE` on Python gRPC server? Before I asked this question, I was monitoring a strange behavior of our service during a rolling update and mostly when scaling pods up. The TTL has already expired, so the client gets new, up-to-date records. https://github.com/grpc/grpc-java/blob/master/netty/src/main/java/io/grpc/netty/NettyClientHandler.java#L462. Python. Already on GitHub? After this change, no RST is sent when the problem is detected. But, when the MaxConnectionAge and MaxConnectionAgeGrace on the server was lesser than the time taken to complete the RPC, I saw the following on the client: Looking for story about robots replacing actors. Is there any way to replicate this behavior with the current akka-grpc API, or any plans to provide such a feature? Ubuntu 18.04.3 with OpenJdk 17.0.3. You would use GRPC_ARG_MAX_CONNECTION_AGE_MS, defined in grpc_types.h: /** Maximum time that a channel may exist. 18 comments usischev commented on Sep 27, 2022 Clone the project from https://github.com/usischev/grpc_poc Yeah, that makes sense. Lately, we have observed several issues that pointed in the same direction our gRPC communication. Not shown in the picture, but when the pod comes back, it looks similar to picture 3, i.e. Grpc.Core.RpcException method is unimplemented with C# client and Java Server. https://github.com/Netflix/concurrency-limits, I am also interested in this. I think my current options are: +1 Did you mean any particular option available in NettyChannelBuilder? Are there any best practices/recommendations/docs about this? To cause RESOURCE_EXHAUSTED we'd have to accept the connection and respond with RESOURCE_EXHAUSTED for each inbound RPC. I0502 15:24:30.825472 83849 pickfirst.go:73] pickfirstBalancer: HandleSubConnStateChange: 0xc000475c00, TRANSIENT_FAILURE Connection timeouts and RPC timeouts are separate. All requests get pinned to original destinations pods, as shown below until a new DNS discovery happens (with headless service). Sure. After this time, the connection is terminated, gRPC clients get the GOAWAY signal and start rediscovery. // which the connection will be forcibly closed. 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. So clients started a new rediscovery every 15 seconds but got obsolete DNS records. You switched accounts on another tab or window. And it wont happen until at least one of the existing connections breaks. 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. 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. Does the US have a duty to negotiate the release of detained US citizens in the DPRK? I guess it would be helpful to know the more precise use cases (I know use cases for this, but I want to know your reason for asking) and expected behavior when the limit is exceeded. All configurations trigger the exceptions eventually. Are there separate timeouts for connection establishment and the full request? Okay I am taking a look at your repo - the source code and the logs. You switched accounts on another tab or window. The time between the starts of each pod was 15 seconds. And this fails constraint 3. I believe reliable and resilient communication should be your end goal. Well occasionally send you account related emails. Idleness duration is, // defined since the most recent time the number of outstanding RPCs became, // MaxConnectionAge is a duration for the maximum amount of time a, // connection may exist before it will be closed by sending a GoAway. Maybe the TTL based DNS resolution could be a solution #23427 (comment). I have a different issue that would be resolved by the same configuration. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. Yes. 1 You can use grpc.server () 's options argument: options - An optional list of key-value pairs ( channel_arguments in gRPC runtime) to configure the channel. My team recently faced that issue, and we used an L4 balancer, in the form of a Kubernetes external service (type: LoadBalancer). Client receives responses successfully. We would also need to decide how "big" of a feature this becomes, since I do think there are various levels of completeness and their associated complexity that the solutions could have. Example of graceful shutdown with grpc healthserver * httpserver : JDBCtimeout; ;,bug. We can see the client pinging the server every 10s while our setting is 3s, the reason is written in the config description: As we can see at the 4th time the client pinging the server it throw a `ENHANCE_YOUR_CALM` error and send a GOAWAY to the client, it make all the rpcs force closed and this was ignoring the Grace Period. @wjywbs - can you confirm this? Should I trigger a chargeback? Such a feature should be cross-language, and I confirmed that with the other languages today. If MaxConnectionAgeGrace passes, then this would be expected. If everything is stable, the client never re-resolves the names and recreates new connections. Other options might be the use of Proxy load balancing or implementing another discovery method that will ask Kubernetes API instead of DNS. @laurovenancio, I'm suspicious of that change. modified, and redistributed. const express = require(" For example: There is no timestamp, the exception happens at different iteration numbers on different runs of the same code. Modules with tagged versions give importers more predictable builds. How three lines of configuration solved our gRPC scaling - Medium So while I was able to make this work locally by using dns://localhost:1053/my-headless-service:5000, in production I first tried a naked dns:my-headless-service:5000 and a double-slashed dns://my-headless-service:5000 before landing on the correct triple-slashed dns:///my-headless-service:5000. One server pod crashed due to overload rediscovery happens. However, I am getting below error on client side: Trying to implement short lived streams using max connection age and grace. // After a duration of this time if the client doesn't see any activity it. forPort (port) . Already on GitHub? 10s, Timeout ping 20s. gRPC tracing led us to reduce our overall response time by 50 percent EnforcementPolicy is used to set keepalive enforcement policy on the Roadrunner: Plugins - gRPC Each rpc takes a few seconds to complete, within the one minute grace period. to your account. This is default behavior of the lib and solves constraint number 2. To see all available qualifiers, see our documentation. Redistributable licenses place minimal restrictions on how software can be used, For reasons outside my control, I have a firewall that kills TCP connections after 15 minutes regardless of their activity. @khsahaji, open an issue on the grpc-go repo. You switched accounts on another tab or window. Since MaxConnectionAge and MaxConnectionAgeGrace have passed on the server, it force closes the connection. We have migrated some of these integrations to gRPC mostly because of the overhead of REST we wanted to get rid of. It reduces the overhead of connection management. Is there any way to replicate this behavior with the current akka-grpc API. Thanks for your fix @dfawley. privacy statement. Find centralized, trusted content and collaborate around the technologies you use most. I am using node js with express to get the information. And the RST I found is a smoking gun for that. Using keepalive in client-side sometime can be dangerous if you misconfigured, we need to pay extra attention and check the documentation carefully. You signed in with another tab or window. It is supposed to start with a 20 second timeout, and in extreme cases increase as the backoff increases over 20 seconds. GRPC C++: grpc::ServerContext Class Reference - GitHub Pages To work around this, we've configured a MAX_CONNECTION_AGE on the server: When the connection reaches its max-age, it will be closed and will trigger a re-resolve from the client. These configure how the client will actively probe to notice when a MaxConnectionAge time.Duration // The current default value is infinity. Making statements based on opinion; back them up with references or personal experience. This case is not reflected in the minimal project. go.dev uses cookies from Google to deliver and enhance the quality of its services and to ports: # The standard AMQP protocol port - '5672:5672' # HTTP management UI - '15672:15672' # Run this container on a private network for this application. privacy statement. Go, RabbitMQ and gRPC Clean Architecture microservice We read every piece of feedback, and take your input very seriously. The Kubernetes deployment specification allows us to set a minimum amount of time that a new pod must be in the ready state before it starts terminating the old pod. Although looking at ejona-trial1.pcap.gz above, it doesn't entirely fit as the client wasn't sending HTTP/2 frames. Usage example Server and client channel setup If you want to dynamically control how much memory gets used (and, thus . If false, and client sends ping when there are no active. I0502 14:33:32.238317 58768 pickfirst.go:73] pickfirstBalancer: HandleSubConnStateChange: 0xc0007e5360, TRANSIENT_FAILURE # # This option is optional. ping @wjywbs - could you gather the debugging info requested and do you have a minimal reproducible test case? KeepaliveParams (keepalive. java - grpc: Implementing shortLived streams using MaxConnectionAge [Server side] is there a way for limit maximum stream in grpc-java? @macmv, for application-level limits like that, I think you should have an interceptor that limits the number of concurrent RPCs/clients to one particular service or method. 593), Stack Overflow at WeAreDevelopers World Congress in Berlin, Temporary policy: Generative AI (e.g., ChatGPT) is banned. For example, with kubernetes cluster ip services this is a very easy way to have some kind of load balancing. gRPC-java comes with various transport implementations (see gRPC transport) and Netty is the main transport implementation. // If true, client sends keepalive pings even with no active RPCs. I'm seeing the same issue in our prod environment. to your account. Register Int valued, milliseconds. Already on GitHub? I tried with a Go server and Go client (which makes one connection to the server and repeatedly makes RPCs on it). Is there a timestamp? Sign in Could you please help me with this. connection is broken and send pings so intermediaries will be aware of the Client stops creating new streams and replies the ping, When all active stream are done, the server closes the connection, Before receiving the final bytes of some streams, the client sends a WINDOW_UPDATE frame. So, if I double the number of instances of my service, the new ones would never receive connections and would be idle. I tested v1.22.0, and there were still many "rpc error: code = Unavailable desc = the connection is draining". It's definition is below. Stories about how and why companies use Go, How Go can help keep you secure by default, Tips for writing clear, performant, and idiomatic Go code, A complete introduction to building software with Go, Reference documentation for Go's standard library, Learn and network with Go developers from around the world. Also, in your case of "only one", it may be fair to just implement that in your service directly, since it is quite a specialized restriction. Have a question about this project? Goal is to keep connection open for streams for a specific time and then terminate gracefully. Most of our microservices have historically communicated via REST calls without any issues. It seems this might be a problem with how we handle the race between choosing a transport and the transport getting the GOAWAY from the server. Autoscaler steps in and scales up clients. Well occasionally send you account related emails. The provided reproducer shutdowns both the client and the server when the issue is detected. DNS TTL cache is almost everywhere. If you're concerned about resources, use grpc.max_connection_idle_ms instead. https://github.com/jtattermusch/grpc-loadbalancing-kubernetes-examples#example-1-round-robin-loadbalancing-with-grpcs-built-in-loadbalancing-policy, 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. if i use grpc.FailFast(false) or grpc.WithDefaultCallOptions(grpc.FailFast(false)), it's will work fine. gRPC poses a known problem for load balancing if you have an L4 load balancer in front of multiple instances of your backend gRPC server. policy. Ideally in my opinion, when the server hits too many connections, failed connection attempts will return RESOURCE_EXHAUSTED to the client. 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. I believe, the RST we see in the tcpdump comes from this shutdown process and not from the issue. // The current default value is infinity. Basics tutorial | C++ | gRPC 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). Need to be careful when you using gRPC keepalive - Medium // The current default value is 20 seconds. It's needed to perform client-side load balancing as shown here: https://github.com/jtattermusch/grpc-loadbalancing-kubernetes-examples#example-1-round-robin-loadbalancing-with-grpcs-built-in-loadbalancing-policy (setting GRPC_MAX_CONNECTION_AGE on server). The text was updated successfully, but these errors were encountered: What's the status of gRPC resource constraints? 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. Also in "Client sends requests with large response size (4 MB)" did you by any chance mean to say "Client sends requests with large request message size (4 MB)". Airline refuses to issue proper receipt. How to handle this now ? // A random jitter of +/-10% will be added to MaxConnectionAge to spread out connection storms. Unavailable error when MaxConnectionAge and - GitHub Is it a concern? What we know about gRPC DNS rediscovery is that it starts only if the old connection breaks or ends with GOAWAY signal. http://stackoverflow.com/questions/37338038/how-to-configure-maximum-number-of-simultaneous-connections-in-grpc. grpcServer = grpc.NewServer(// MaxConnectionAge is just to avoid long connection, to facilitate load balancing // MaxConnectionAgeGrace will torn them, default to infinity: grpc.KeepaliveParams(keepalive.ServerParameters{MaxConnectionAge: 2 * time.Minute}), grpc.StatsHandler(&ocgrpc_propag.ServerHandler{}),) As mentioned above MaxConnectionAge solves this server-side in gRPC. Apart from that, gRPC documentation provides Server-side Connection Management proposal and we gave it a try. Sign in We read every piece of feedback, and take your input very seriously. In the longer term we might want to allow building the client based on Akka HTTP instead, but Akka HTTP does not yet have HTTP/2 support at the client side. The gRPC error model is based on status codes, so it was easy to map them to HTTP codes. // If set below 1s, a minimum value of 1s will be used instead. I'm not quite sure where we'd want to make this change; in Netty or gRPC. 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. public OkHttpServerBuilder keepAliveTime (long keepAliveTime, TimeUnit timeUnit) Sets the time without read activity before sending a keepalive ping. Clients are scaled up again, but the load is still not balanced evenly. Using asyncio could improve performance. When the connection age was reached, the rpcs in the Go client failed with the unavailable error and the "transport is closing" message. integrate the discovery and the load balancing so that when new nodes are discovered, new connections are made accordingly. I have a grpc client that connects to Traefik , backend grpc server sending "GO AWAY" frames but not receiving to client. the new pod doesnt receive traffic. MILLISECONDS) . Can we use a build in way in GRPC to do this? grpc.max_connection_age_ms is a server-side option. 1 Like Also in "Client sends requests with large response size (4 MB)" did you by any chance mean to say "Client sends requests with large request message size (4 MB)". In this project, the server is the same process with the client, all created and started in Main.kt. These hooks can be enabled via a ClientInterceptor as illustrated in this gRPC CensusTracingModule.java documentation. Performance Best Practices | gRPC Allow specifying maximum number of connections on Server, Feature Request - [C++] - Ability to set the maximum connections per server. When a project reaches major version v1 it is considered stable. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. When does the io.grpc.StatusRuntimeException: UNAVAILABLE happen after the RPC is started? The text was updated successfully, but these errors were encountered: Can you turn on logging for the client and server? onStreamClosed() doesn't help us at all, because the RPC will still fail but have even less information about why it was closed. There are similar gRPC hooks available at the client-side to infer time spent in request serialization and response deserialization.