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_r201764385

 File path: 
 @@ -0,0 +1,381 @@
+ * 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;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.jaxrs.smile.SmileMediaTypes;
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.Optional;
+import com.google.common.base.Preconditions;
+import com.google.common.util.concurrent.ListenableFuture;
+import com.google.common.util.concurrent.ListeningExecutorService;
+import com.google.common.util.concurrent.MoreExecutors;
+import io.druid.indexer.TaskLocation;
+import io.druid.indexer.TaskStatus;
+import io.druid.java.util.common.IAE;
+import io.druid.java.util.common.IOE;
+import io.druid.java.util.common.StringUtils;
+import io.druid.java.util.common.concurrent.Execs;
+import io.druid.java.util.emitter.EmittingLogger;
+import io.druid.java.util.http.client.HttpClient;
+import io.druid.java.util.http.client.Request;
+import io.druid.java.util.http.client.response.FullResponseHandler;
+import io.druid.java.util.http.client.response.FullResponseHolder;
+import io.druid.segment.realtime.firehose.ChatHandlerResource;
+import org.jboss.netty.channel.ChannelException;
+import org.jboss.netty.handler.codec.http.HttpMethod;
+import org.jboss.netty.handler.codec.http.HttpResponseStatus;
+import org.joda.time.Duration;
+import org.joda.time.Period;
+import javax.annotation.Nullable;
+import javax.ws.rs.core.MediaType;
+import java.io.IOException;
+import java.net.Socket;
+import java.net.URI;
+import java.nio.charset.StandardCharsets;
+import java.util.concurrent.Callable;
+ * Abstract class to communicate with index tasks via HTTP. This class 
provides interfaces to serialize/deserialize
 Review comment:
   Or is this going from the overlord to the indexing tasks?
   What if there are a few hundred middle managers, does that cause any 
problems here?

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