MAPREDUCE-6673. Add a test example job that grows in memory usage ove…

…r time (Karthik Kambatla via Haibo Chen)

Change-Id: Iccfc8c67c38c526cc61726d87bfcbcf69ac36fea

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapreduce/GrowingSleepJob.java

@@ -0,0 +1,68 @@
+/**
+ * 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.hadoop.mapreduce;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.io.IntWritable;
+import org.apache.hadoop.util.ToolRunner;
+
+import java.io.IOException;
+import java.util.ArrayList;
+
+/**
+ * A sleep job whose mappers create 1MB buffer for every record.
+ */
+public class GrowingSleepJob extends SleepJob {
+  private static final Log LOG = LogFactory.getLog(GrowingSleepJob.class);
+
+  public static class GrowingSleepMapper extends SleepMapper {
+    private final int MB = 1024 * 1024;
+    private ArrayList<byte[]> bytes = new ArrayList<>();
+
+    @Override
+    public void map(IntWritable key, IntWritable value, Context context)
+        throws IOException, InterruptedException {
+      super.map(key, value, context);
+      long free = Runtime.getRuntime().freeMemory();
+      if (free > 32 * MB) {
+        LOG.info("Free memory = " + free +
+            " bytes. Creating 1 MB on the heap.");
+        bytes.add(new byte[MB]);
+      }
+    }
+  }
+
+  public static void main(String[] args) throws Exception {
+    int res = ToolRunner.run(new Configuration(), new GrowingSleepJob(), args);
+    System.exit(res);
+  }
+
+  @Override
+  public Job createJob(int numMapper, int numReducer,
+                       long mapSleepTime, int mapSleepCount,
+                       long reduceSleepTime, int reduceSleepCount)
+      throws IOException {
+    Job job = super.createJob(numMapper, numReducer, mapSleepTime,
+        mapSleepCount, reduceSleepTime, reduceSleepCount);
+    job.setMapperClass(GrowingSleepMapper.class);
+    job.setJobName("Growing sleep job");
+    return job;
+  }
+}

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/test/MapredTestDriver.java

@@ -42,6 +42,7 @@
 import org.apache.hadoop.mapred.TestTextInputFormat;
 import org.apache.hadoop.mapred.ThreadedMapBenchmark;
 import org.apache.hadoop.mapreduce.FailJob;
+import org.apache.hadoop.mapreduce.GrowingSleepJob;
 import org.apache.hadoop.mapreduce.LargeSorter;
 import org.apache.hadoop.mapreduce.MiniHadoopClusterManager;
 import org.apache.hadoop.mapreduce.SleepJob;
@@ -90,6 +91,8 @@ public MapredTestDriver(ProgramDriver pgd) {
       pgd.addClass("fail", FailJob.class, "a job that always fails");
       pgd.addClass("sleep", SleepJob.class,
                    "A job that sleeps at each map and reduce task.");
+      pgd.addClass("gsleep", GrowingSleepJob.class,
+          "A sleep job whose mappers create 1MB buffer for every record.");
       pgd.addClass("timelineperformance", TimelineServicePerformance.class,
                    "A job that launches mappers to test timline service " +
                    "performance.");