Github user dineshjoshi commented on a diff in the pull request:
https://github.com/apache/cassandra/pull/255#discussion_r213557051
--- Diff: src/java/org/apache/cassandra/tools/fqltool/QueryReplayer.java ---
@@ -0,0 +1,150 @@
+/*
+ * 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.cassandra.tools.fqltool;
+
+import java.io.Closeable;
+import java.io.File;
+import java.io.PrintStream;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.function.Predicate;
+import java.util.stream.Collectors;
+
+import javax.annotation.Nullable;
+
+import com.google.common.util.concurrent.FutureCallback;
+import com.google.common.util.concurrent.Futures;
+import com.google.common.util.concurrent.ListenableFuture;
+
+import com.codahale.metrics.MetricRegistry;
+import com.codahale.metrics.Timer;
+import com.datastax.driver.core.Cluster;
+import com.datastax.driver.core.Session;
+import org.apache.cassandra.utils.FBUtilities;
+
+public class QueryReplayer implements Closeable
+{
+ private final ExecutorService es = Executors.newFixedThreadPool(1);
+ private final Iterator<List<FQLQuery>> queryIterator;
+ private final List<String> targetHosts;
--- End diff --
This variable is unused. Its only used in the constructor.
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