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[GitHub] drcrallen commented on a change in pull request #5492: Native parallel batch indexing without shuffle

drcrallen commented on a change in pull request #5492: Native parallel batch indexing without shuffle
URL: https://github.com/apache/incubator-druid/pull/5492#discussion_r201788708

 File path: indexing-service/src/test/java/io/druid/indexing/common/task/TaskMonitorTest.java
 @@ -0,0 +1,220 @@
+ * Licensed to Metamarkets Group Inc. (Metamarkets) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. Metamarkets 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
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package io.druid.indexing.common.task;
+import com.google.common.util.concurrent.ListenableFuture;
+import io.druid.client.indexing.NoopIndexingServiceClient;
+import io.druid.client.indexing.TaskStatusResponse;
+import io.druid.data.input.InputSplit;
+import io.druid.indexer.RunnerTaskState;
+import io.druid.indexer.TaskLocation;
+import io.druid.indexer.TaskState;
+import io.druid.indexer.TaskStatus;
+import io.druid.indexer.TaskStatusPlus;
+import io.druid.indexing.common.TaskToolbox;
+import io.druid.indexing.common.task.TaskMonitor.SubTaskCompleteEvent;
+import io.druid.indexing.common.task.TaskMonitor.TaskHistory;
+import io.druid.java.util.common.DateTimes;
+import io.druid.java.util.common.concurrent.Execs;
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+public class TaskMonitorTest
 Review comment:
   Is there any way to add concurrency tests here? there seem to be a lot of potentially shaky concurrency items in the monitor, and if they can be tested that could help shake out bugs early.

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