| /* |
| * 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.flink.streaming.tests; |
| |
| import org.apache.flink.api.java.utils.ParameterTool; |
| import org.apache.flink.configuration.ConfigOption; |
| import org.apache.flink.configuration.ConfigOptions; |
| import org.apache.flink.configuration.Configuration; |
| import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; |
| import org.apache.flink.streaming.api.functions.sink.RichSinkFunction; |
| import org.apache.flink.streaming.api.functions.source.RichParallelSourceFunction; |
| |
| import org.apache.flink.shaded.netty4.io.netty.util.internal.OutOfDirectMemoryError; |
| |
| import sun.misc.Unsafe; |
| |
| import static org.apache.flink.util.Preconditions.checkArgument; |
| |
| /** |
| * Test program to verify the direct memory consumption of Netty. Without zero-copy Netty may create |
| * more than one chunk, thus we may encounter {@link OutOfDirectMemoryError} if we limit the total |
| * direct memory to be less than two chunks. Instead, with zero-copy introduced in |
| * (https://issues.apache.org/jira/browse/FLINK-10742) one chunk will be enough and the exception |
| * will not occur. |
| * |
| * <p>Since Netty uses low level API of {@link Unsafe} to allocate direct buffer when using JDK8 and |
| * these memory will not be counted in direct memory, the test is only effective when JDK11 is used. |
| */ |
| public class NettyShuffleMemoryControlTestProgram { |
| private static final int RECORD_LENGTH = 2048; |
| |
| private static final ConfigOption<Integer> RUNNING_TIME_IN_SECONDS = |
| ConfigOptions.key("test.running_time_in_seconds") |
| .defaultValue(120) |
| .withDescription("The time to run."); |
| |
| private static final ConfigOption<Integer> MAP_PARALLELISM = |
| ConfigOptions.key("test.map_parallelism") |
| .defaultValue(1) |
| .withDescription("The number of map tasks."); |
| |
| private static final ConfigOption<Integer> REDUCE_PARALLELISM = |
| ConfigOptions.key("test.reduce_parallelism") |
| .defaultValue(1) |
| .withDescription("The number of reduce tasks."); |
| |
| public static void main(String[] args) throws Exception { |
| // parse the parameters |
| final ParameterTool params = ParameterTool.fromArgs(args); |
| |
| final int runningTimeInSeconds = |
| params.getInt( |
| RUNNING_TIME_IN_SECONDS.key(), RUNNING_TIME_IN_SECONDS.defaultValue()); |
| final int mapParallelism = |
| params.getInt(MAP_PARALLELISM.key(), MAP_PARALLELISM.defaultValue()); |
| final int reduceParallelism = |
| params.getInt(REDUCE_PARALLELISM.key(), REDUCE_PARALLELISM.defaultValue()); |
| |
| checkArgument( |
| runningTimeInSeconds > 0, |
| "The running time in seconds should be positive, but it is {}", |
| runningTimeInSeconds); |
| checkArgument( |
| mapParallelism > 0, |
| "The number of map tasks should be positive, but it is {}", |
| mapParallelism); |
| checkArgument( |
| reduceParallelism > 0, |
| "The number of reduce tasks should be positve, but it is {}", |
| reduceParallelism); |
| |
| StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment(); |
| env.addSource(new StringSourceFunction(runningTimeInSeconds)) |
| .setParallelism(mapParallelism) |
| .slotSharingGroup("a") |
| .shuffle() |
| .addSink(new DummySink()) |
| .setParallelism(reduceParallelism) |
| .slotSharingGroup("b"); |
| |
| // execute program |
| env.execute("Netty Shuffle Memory Control Test"); |
| } |
| |
| private static class StringSourceFunction extends RichParallelSourceFunction<String> { |
| private static final long serialVersionUID = 1L; |
| |
| private volatile boolean isRunning; |
| |
| private final long runningTimeInSeconds; |
| |
| private transient long stopTime; |
| |
| public StringSourceFunction(long runningTimeInSeconds) { |
| this.runningTimeInSeconds = runningTimeInSeconds; |
| } |
| |
| @Override |
| public void open(Configuration parameters) { |
| isRunning = true; |
| stopTime = System.nanoTime() + runningTimeInSeconds * 1_000_000_000L; |
| } |
| |
| @Override |
| public void run(SourceContext<String> ctx) { |
| byte[] bytes = new byte[RECORD_LENGTH]; |
| for (int i = 0; i < RECORD_LENGTH; ++i) { |
| bytes[i] = 'a'; |
| } |
| String str = new String(bytes); |
| |
| while (isRunning && (System.nanoTime() < stopTime)) { |
| ctx.collect(str); |
| } |
| } |
| |
| @Override |
| public void cancel() { |
| isRunning = false; |
| } |
| } |
| |
| private static class DummySink extends RichSinkFunction<String> { |
| |
| @Override |
| public void invoke(String value, Context context) throws Exception { |
| // Do nothing. |
| } |
| } |
| } |