elek commented on a change in pull request #1341: HDDS-2022. Add additional 
freon tests
URL: https://github.com/apache/hadoop/pull/1341#discussion_r324412003
 
 

 ##########
 File path: 
hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/freon/SameKeyReader.java
 ##########
 @@ -0,0 +1,109 @@
+/**
+ * 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.ozone.freon;
+
+import java.io.InputStream;
+import java.security.MessageDigest;
+import java.util.concurrent.Callable;
+
+import org.apache.hadoop.hdds.cli.HddsVersionProvider;
+import org.apache.hadoop.hdds.conf.OzoneConfiguration;
+import org.apache.hadoop.ozone.client.OzoneBucket;
+import org.apache.hadoop.ozone.client.OzoneClient;
+import org.apache.hadoop.ozone.client.OzoneClientFactory;
+
+import com.codahale.metrics.Timer;
+import org.apache.commons.io.IOUtils;
+import picocli.CommandLine.Command;
+import picocli.CommandLine.Option;
+
+/**
+ * Data generator tool test om performance.
+ */
+@Command(name = "ocokr",
+    aliases = "ozone-client-one-key-reader",
+    description = "Read the same key from multiple threads.",
+    versionProvider = HddsVersionProvider.class,
+    mixinStandardHelpOptions = true,
+    showDefaultValues = true)
+public class SameKeyReader extends BaseFreonGenerator
+    implements Callable<Void> {
+
+  @Option(names = {"-v", "--volume"},
+      description = "Name of the bucket which contains the test data. Will be"
+          + " created if missing.",
+      defaultValue = "vol1")
+  private String volumeName;
+
+  @Option(names = {"-b", "--bucket"},
+      description = "Name of the bucket which contains the test data. Will be"
+          + " created if missing.",
+      defaultValue = "bucket1")
+  private String bucketName;
+
+  @Option(names = {"-k", "--key"},
+      description = "Name of the key read from multiple threads",
+      defaultValue = "bucket1")
 
 Review comment:
   Oh, Shame on me. I didn't notice that it's a **key** and not a bucket. Let 
me make it required without default value.

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