Got it, thank you! On Thursday, March 1, 2018 at 4:11:18 PM UTC-5, Carl Mastrangelo wrote: > > Answers inline > > On Thursday, March 1, 2018 at 12:53:15 PM UTC-8, vicva...@gmail.com wrote: >> >> >> Hi Guys, >> >> Can someone please answer a few questions about GRPC threading model? >> >> If I create a ManagedChannel thusly: >> >> NettyChannelBuilder builder = NettyChannelBuilder.forAddress( host, port >> ); >> builder.eventLoopGroup( new NioEventLoopGroup(2) ); >> builder.executor( new ThreadPoolExecutor( 1, 1, 0L, >> TimeUnit.MILLISECONDS, new ArrayBlockingQueue<>( 10000 )); >> >> 1) The 2 EventLoop threads will be used to process data from the network? >> 2) The single user thread will be used for callbacks from grpc layer to >> my application layer? >> >> >> Now if I change my ManagedChannel to: >> >> NettyChannelBuilder builder = NettyChannelBuilder.forAddress( host, port >> ); >> builder.eventLoopGroup( new NioEventLoopGroup(2) ); >> builder.directExecutor(); >> >> 1) Will one of the event loop threads will do the work of user thread? >> > > Yes. The upside is that latency is less, (by about 25us) due to not > needing a thread hop. The downside is that if you block in your > application work load, you run the risk of deadlock or very high latency > for other RPCs. > > >> 2) When I try this scenario, I see that a thread called >> *[grpc-default-executor-0] * is created. What does this thread intended >> to do? >> > > That may be DNS resolver, as DNS resolution is a blocking operation in > java (we would love for this to be fixed!) > > >> >> Thanks >> >
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