himanshug commented on a change in pull request #8578: parallel broker merges 
on fork join pool
URL: https://github.com/apache/incubator-druid/pull/8578#discussion_r335151691
 
 

 ##########
 File path: 
core/src/main/java/org/apache/druid/java/util/common/guava/ParallelMergeCombiningSequence.java
 ##########
 @@ -0,0 +1,1071 @@
+/*
+ * 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.druid.java.util.common.guava;
+
+import com.google.common.collect.Lists;
+import com.google.common.collect.Ordering;
+import org.apache.druid.java.util.common.RE;
+import org.apache.druid.java.util.common.logger.Logger;
+import org.apache.druid.utils.JvmUtils;
+
+import javax.annotation.Nullable;
+import java.io.IOException;
+import java.util.ArrayDeque;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+import java.util.NoSuchElementException;
+import java.util.Objects;
+import java.util.PriorityQueue;
+import java.util.Queue;
+import java.util.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.ForkJoinPool;
+import java.util.concurrent.RecursiveAction;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.function.BinaryOperator;
+
+/**
+ * Artisanal, locally-sourced, hand-crafted, gluten and GMO free, bespoke, 
small-batch parallel merge combinining sequence
 
 Review comment:
   not organic ? :-P
   
   maybe copy some part from 
https://github.com/apache/incubator-druid/issues/8577 also and add link to that 
.

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