glasser commented on a change in pull request #8107: Add CliIndexer process 
type and initial task runner implementation

 File path: 
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+ * 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
+ *
+ *
+ *
+ * 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 org.apache.druid.indexing.overlord;
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.apache.druid.guice.annotations.Self;
+import org.apache.druid.indexer.RunnerTaskState;
+import org.apache.druid.indexer.TaskLocation;
+import org.apache.druid.indexer.TaskStatus;
+import org.apache.druid.indexing.common.TaskReportFileWriter;
+import org.apache.druid.indexing.common.TaskToolbox;
+import org.apache.druid.indexing.common.TaskToolboxFactory;
+import org.apache.druid.indexing.common.config.TaskConfig;
+import org.apache.druid.indexing.common.task.Task;
+import org.apache.druid.indexing.overlord.autoscaling.ScalingStats;
+import org.apache.druid.indexing.worker.config.WorkerConfig;
+import org.apache.druid.query.Query;
+import org.apache.druid.query.QueryRunner;
+import org.apache.druid.query.QuerySegmentWalker;
+import org.apache.druid.query.SegmentDescriptor;
+import org.apache.druid.segment.realtime.appenderator.AppenderatorsManager;
+import org.apache.druid.server.DruidNode;
+import org.apache.druid.tasklogs.TaskLogPusher;
+import org.apache.druid.tasklogs.TaskLogStreamer;
+import org.joda.time.DateTime;
+import org.joda.time.Interval;
+import javax.annotation.Nullable;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.CopyOnWriteArrayList;
+import java.util.concurrent.Executor;
+import java.util.concurrent.TimeUnit;
+ * TaskRunner implemention for the Indexer task execution service, which runs 
all tasks in a single process.
+ *
+ * Two thread pools are used:
+ * - A task execution pool, sized to number of worker slots. This is used to 
execute the Task run() methods.
+ * - A control thread pool, sized to worker slots * 2. The control threads 
setup and submit work to the
+ *   task execution pool, and are also responsible for running graceful 
shutdown on the Task objects.
+ *   Only one shutdown per-task can be running at a given time, and there is 
one control thread per task,
+ *   thus the pool has 2 * worker slots.
+ *
+ * Note that separate task logs are not supported, all task log entries will 
be written to the Indexer process log
 Review comment:
   One thing that would be nice is if there was still some way for the "task 
log" link in the web console to work, even if its implementation ended up being 
some sort of grep over a larger log file.

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