[GitHub] [hadoop] ayushtkn commented on a diff in pull request #4257: MAPREDUCE-7376. AggregateWordCount fetches wrong results.

[GitBox <gi...@apache.org>]

ayushtkn commented on code in PR #4257:
URL: https://github.com/apache/hadoop/pull/4257#discussion_r864687143


##########
hadoop-mapreduce-project/hadoop-mapreduce-examples/src/test/java/org/apache/hadoop/examples/TestAggregateWordCount.java:
##########
@@ -0,0 +1,112 @@
+/**
+ * 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
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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.hadoop.examples;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.security.Permission;
+
+import org.junit.After;
+import org.junit.Test;
+
+import org.apache.commons.io.IOUtils;
+import org.apache.hadoop.fs.FSDataInputStream;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.FileUtil;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.mapred.HadoopTestCase;
+import org.apache.hadoop.util.ExitUtil.ExitException;
+
+import static org.junit.Assert.assertEquals;
+
+public class TestAggregateWordCount extends HadoopTestCase {
+  public TestAggregateWordCount() throws IOException {
+    super(LOCAL_MR, LOCAL_FS, 1, 1);
+  }
+
+  @After
+  public void tearDown() throws Exception {
+    getFileSystem().delete(TEST_DIR, true);
+    super.tearDown();
+  }
+
+  // Input/Output paths for sort
+  private static final Path TEST_DIR = new Path(
+      new File(System.getProperty("test.build.data", "/tmp"),
+          "aggregatewordcount").getAbsoluteFile().toURI().toString());
+
+  private static final Path INPUT_PATH = new Path(TEST_DIR, "inPath");
+  private static final Path OUTPUT_PATH = new Path(TEST_DIR, "outPath");
+
+  @Test
+  public void testAggregateTestCount()
+      throws IOException, ClassNotFoundException, InterruptedException {
+    SecurityManager securityManager = System.getSecurityManager();
+    System.setSecurityManager(new NoExitSecurityManager());
+    try {
+      FileSystem fs = getFileSystem();
+      fs.mkdirs(INPUT_PATH);
+      Path file1 = new Path(INPUT_PATH, "file1");
+      Path file2 = new Path(INPUT_PATH, "file2");
+      FileUtil.write(fs, file1, "Hello World");
+      FileUtil.write(fs, file2, "Hello Hadoop");
+
+      String[] args =
+          new String[] {INPUT_PATH.toString(), OUTPUT_PATH.toString(), "1",
+              "textinputformat"};
+
+      // Run AggregateWordCount Job.
+      try {
+        AggregateWordCount.main(args);
+      } catch (ExitException e) {
+        // Ignore
+      }
+
+      String allEntries;
+      try (FSDataInputStream stream = fs
+          .open(new Path(OUTPUT_PATH, "part-r-00000"));) {
+        allEntries = IOUtils.toString(stream, Charset.defaultCharset());
+      }
+
+      assertEquals("Hadoop\t1\n" + "Hello\t2\n" + "World\t1\n", allEntries);

Review Comment:
   Yeps, It is always sorted, that is what the javadoc of the job says:
   ```
   This is an example Aggregated Hadoop Map/Reduce application. It reads the
    text input files, breaks each line into words and counts them. **The output is
    a locally sorted list of words and the count of how often they occurred.**
   ```
   



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