AHeise commented on a change in pull request #10084: [FLINK-14382][yarn] Incorrect handling of FLINK_PLUGINS_DIR on Yarn URL: https://github.com/apache/flink/pull/10084#discussion_r342786757
########## File path: flink-end-to-end-tests/flink-plugins-test/wordcount/src/main/java/org/apache/flink/fs/dummy/examples/WordCount.java ########## @@ -0,0 +1,157 @@ +/* + * 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.fs.dummy.examples; + +import org.apache.flink.api.common.functions.FlatMapFunction; +import org.apache.flink.api.java.DataSet; +import org.apache.flink.api.java.ExecutionEnvironment; +import org.apache.flink.api.java.tuple.Tuple2; +import org.apache.flink.api.java.utils.ParameterTool; +import org.apache.flink.core.fs.FileSystem; +import org.apache.flink.util.Collector; +import org.apache.flink.util.Preconditions; + +import java.io.IOException; +import java.net.URI; + +/** + * Word Count example for testing plugin mechanism. + * dummy://localhost/words and anotherDummy://localhost/words could be supported together. + * Different filesystem schema should have different classloader. + * Different filesystem can not see any classes from the others. + */ +public class WordCount { + + // ************************************************************************* + // PROGRAM + // ************************************************************************* + + public static void main(String[] args) throws Exception { + + final ParameterTool params = ParameterTool.fromArgs(args); + + // set up the execution environment + final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment(); + + // make parameters available in the web interface + env.getConfig().setGlobalJobParameters(params); + + // get input data + DataSet<String> text1, text2; + String uriOfInput1, uriOfInput2; + if (params.has("input1") && params.has("input2")) { + uriOfInput1 = params.get("input1"); + uriOfInput2 = params.get("input2"); + } else { + throw new IllegalArgumentException("--input1 and --input2 should be specified."); + } + text1 = env.readTextFile(uriOfInput1); + text2 = env.readTextFile(uriOfInput2); + + DataSet<Tuple2<String, Integer>> counts = + // split up the lines in pairs (2-tuples) containing: (word,1) + text1.union(text2).flatMap(new Tokenizer(uriOfInput1, uriOfInput2)) + // group by the tuple field "0" and sum up tuple field "1" + .groupBy(0) + .sum(1); + + // emit result + if (params.has("output")) { + counts.writeAsCsv(params.get("output"), "\n", ","); + // execute program + env.execute("Two input WordCount Example for plugin mechanism."); + } else { + System.out.println("Printing result to stdout. Use --output to specify output path."); + counts.print(); + } + + } + + // ************************************************************************* + // USER FUNCTIONS + // ************************************************************************* + + /** + * Implements the string tokenizer that splits sentences into words as a user-defined + * FlatMapFunction. The function takes a line (String) and splits it into + * multiple pairs in the form of "(word,1)" ({@code Tuple2<String, Integer>}). + */ + public static final class Tokenizer implements FlatMapFunction<String, Tuple2<String, Integer>> { + + private final String input1; + private final String input2; + + public Tokenizer(String input1, String input2) { + this.input1 = input1; + this.input2 = input2; + } + + @Override + public void flatMap(String value, Collector<Tuple2<String, Integer>> out) throws IOException { + + checkClassIsolation(); Review comment: Move to `open` of a `RichFlatMapFunction`? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services
