symious commented on code in PR #1283: URL: https://github.com/apache/ratis/pull/1283#discussion_r2357767899
########## ratis-grpc/src/main/java/org/apache/ratis/grpc/server/GrpcStubPool.java: ########## @@ -0,0 +1,105 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.apache.ratis.grpc.server; + +import org.apache.ratis.protocol.RaftPeer; +import org.apache.ratis.thirdparty.io.grpc.ManagedChannel; +import org.apache.ratis.thirdparty.io.grpc.netty.NettyChannelBuilder; +import org.apache.ratis.thirdparty.io.grpc.stub.AbstractStub; +import org.apache.ratis.thirdparty.io.netty.channel.ChannelOption; +import org.apache.ratis.thirdparty.io.netty.channel.WriteBufferWaterMark; +import org.apache.ratis.thirdparty.io.netty.channel.nio.NioEventLoopGroup; +import org.apache.ratis.thirdparty.io.netty.channel.socket.nio.NioSocketChannel; + +import java.util.List; +import java.util.concurrent.Semaphore; +import java.util.concurrent.atomic.AtomicInteger; + +final class GrpcStubPool<S extends AbstractStub<S>> implements AutoCloseable { + + static final class PooledStub<S extends AbstractStub<S>> { + private final ManagedChannel ch; + private final S stub; + private final Semaphore permits; + PooledStub(ManagedChannel ch, S stub, int maxInflight) { + this.ch = ch; + this.stub = stub; + this.permits = new Semaphore(maxInflight); + } + + S getStub() { + return stub; + } + } + + private final List<PooledStub<S>> pool; + private final AtomicInteger rr = new AtomicInteger(); + private final NioEventLoopGroup elg; + private final int size; + + GrpcStubPool(RaftPeer target, int n, java.util.function.Function<ManagedChannel, S> stubFactory) { + this(target, n, stubFactory, Math.max(2, Runtime.getRuntime().availableProcessors()/2), 16); + } + + GrpcStubPool(RaftPeer target, int n, + java.util.function.Function<ManagedChannel, S> stubFactory, + int elgThreads, int maxInflightPerConn) { + this.elg = new NioEventLoopGroup(elgThreads); + java.util.ArrayList<PooledStub<S>> tmp = new java.util.ArrayList<>(n); + for (int i = 0; i < n; i++) { + ManagedChannel ch = NettyChannelBuilder.forTarget(target.getAddress()) + .eventLoopGroup(elg) + .channelType(NioSocketChannel.class) + .keepAliveTime(30, java.util.concurrent.TimeUnit.SECONDS) + .keepAliveWithoutCalls(true) + .idleTimeout(24, java.util.concurrent.TimeUnit.HOURS) + .withOption(ChannelOption.WRITE_BUFFER_WATER_MARK, new WriteBufferWaterMark(64<<10, 128<<10)) + .usePlaintext() + .build(); + tmp.add(new PooledStub<>(ch, stubFactory.apply(ch), maxInflightPerConn)); + ch.getState(true); + } + this.pool = java.util.Collections.unmodifiableList(tmp); + this.size = n; + } + + PooledStub<S> acquire() throws InterruptedException { + int start = rr.getAndIncrement(); + for (int k = 0; k < size; k++) { + PooledStub<S> p = pool.get((start + k) % size); + if (p.permits.tryAcquire()) { + return p; + } + } + PooledStub<S> p = pool.get(Math.floorMod(start, size)); + p.permits.acquire(); + return p; + } + + void release(PooledStub<S> p) { + p.permits.release(); + } Review Comment: Updated. ########## ratis-grpc/src/main/java/org/apache/ratis/grpc/server/GrpcStubPool.java: ########## @@ -0,0 +1,105 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.apache.ratis.grpc.server; + +import org.apache.ratis.protocol.RaftPeer; +import org.apache.ratis.thirdparty.io.grpc.ManagedChannel; +import org.apache.ratis.thirdparty.io.grpc.netty.NettyChannelBuilder; +import org.apache.ratis.thirdparty.io.grpc.stub.AbstractStub; +import org.apache.ratis.thirdparty.io.netty.channel.ChannelOption; +import org.apache.ratis.thirdparty.io.netty.channel.WriteBufferWaterMark; +import org.apache.ratis.thirdparty.io.netty.channel.nio.NioEventLoopGroup; +import org.apache.ratis.thirdparty.io.netty.channel.socket.nio.NioSocketChannel; + +import java.util.List; +import java.util.concurrent.Semaphore; +import java.util.concurrent.atomic.AtomicInteger; + +final class GrpcStubPool<S extends AbstractStub<S>> implements AutoCloseable { + + static final class PooledStub<S extends AbstractStub<S>> { + private final ManagedChannel ch; + private final S stub; + private final Semaphore permits; + PooledStub(ManagedChannel ch, S stub, int maxInflight) { + this.ch = ch; + this.stub = stub; + this.permits = new Semaphore(maxInflight); + } + + S getStub() { + return stub; + } + } + + private final List<PooledStub<S>> pool; + private final AtomicInteger rr = new AtomicInteger(); + private final NioEventLoopGroup elg; + private final int size; + + GrpcStubPool(RaftPeer target, int n, java.util.function.Function<ManagedChannel, S> stubFactory) { + this(target, n, stubFactory, Math.max(2, Runtime.getRuntime().availableProcessors()/2), 16); + } + + GrpcStubPool(RaftPeer target, int n, + java.util.function.Function<ManagedChannel, S> stubFactory, + int elgThreads, int maxInflightPerConn) { + this.elg = new NioEventLoopGroup(elgThreads); + java.util.ArrayList<PooledStub<S>> tmp = new java.util.ArrayList<>(n); + for (int i = 0; i < n; i++) { + ManagedChannel ch = NettyChannelBuilder.forTarget(target.getAddress()) + .eventLoopGroup(elg) + .channelType(NioSocketChannel.class) + .keepAliveTime(30, java.util.concurrent.TimeUnit.SECONDS) + .keepAliveWithoutCalls(true) + .idleTimeout(24, java.util.concurrent.TimeUnit.HOURS) + .withOption(ChannelOption.WRITE_BUFFER_WATER_MARK, new WriteBufferWaterMark(64<<10, 128<<10)) + .usePlaintext() + .build(); + tmp.add(new PooledStub<>(ch, stubFactory.apply(ch), maxInflightPerConn)); + ch.getState(true); + } + this.pool = java.util.Collections.unmodifiableList(tmp); + this.size = n; + } + + PooledStub<S> acquire() throws InterruptedException { + int start = rr.getAndIncrement(); Review Comment: For this one, might it block if there is no for loop? ########## ratis-grpc/src/main/java/org/apache/ratis/grpc/server/GrpcStubPool.java: ########## @@ -0,0 +1,105 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.apache.ratis.grpc.server; + +import org.apache.ratis.protocol.RaftPeer; +import org.apache.ratis.thirdparty.io.grpc.ManagedChannel; +import org.apache.ratis.thirdparty.io.grpc.netty.NettyChannelBuilder; +import org.apache.ratis.thirdparty.io.grpc.stub.AbstractStub; +import org.apache.ratis.thirdparty.io.netty.channel.ChannelOption; +import org.apache.ratis.thirdparty.io.netty.channel.WriteBufferWaterMark; +import org.apache.ratis.thirdparty.io.netty.channel.nio.NioEventLoopGroup; +import org.apache.ratis.thirdparty.io.netty.channel.socket.nio.NioSocketChannel; + +import java.util.List; +import java.util.concurrent.Semaphore; +import java.util.concurrent.atomic.AtomicInteger; + +final class GrpcStubPool<S extends AbstractStub<S>> implements AutoCloseable { Review Comment: Updated. -- This is an automated message from the Apache Git Service. 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