mcvsubbu commented on a change in pull request #4993: Support Text column type 
in Pinot (both offline and realtime)
URL: https://github.com/apache/incubator-pinot/pull/4993#discussion_r379157224
 
 

 ##########
 File path: 
pinot-core/src/main/java/org/apache/pinot/core/realtime/impl/invertedindex/RealtimeLuceneIndexReaderRefreshThread.java
 ##########
 @@ -0,0 +1,133 @@
+/**
+ * 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.pinot.core.realtime.impl.invertedindex;
+
+import java.util.List;
+import java.util.concurrent.ConcurrentLinkedQueue;
+import java.util.concurrent.locks.Condition;
+import java.util.concurrent.locks.Lock;
+import org.apache.lucene.search.SearcherManager;
+import org.apache.lucene.store.AlreadyClosedException;
+import org.apache.pinot.core.segment.creator.impl.SegmentColumnarIndexCreator;
+import 
org.apache.pinot.core.realtime.impl.invertedindex.RealtimeLuceneIndexRefreshState.RealtimeLuceneReadersForRealtimeSegment;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+
+/**
+ * Background thread to refresh the realtime lucene index readers for 
supporting
+ * near-realtime text search. The task maintains a queue of realtime segments.
+ * This queue is global (across all realtime segments of all realtime/hybrid 
tables).
+ *
+ * Each element in the queue is of type {@link 
RealtimeLuceneReadersForRealtimeSegment}.
+ * It encapsulates a lock and all the realtime lucene readers for the 
particular realtime segment.
+ * Since text index is also create on a per column basis, there will be as 
many realtime lucene
+ * readers as the number of columns with text search enabled.
+ *
+ * Between each successive execution of the task, there is a fixed delay 
(regardless of how long
+ * each execution took). When the task wakes up, it pick the 
RealtimeLuceneReadersForRealtimeSegment
+ * from the head of queue, refresh it's readers and adds this at the tail of 
queue.
+ */
+public class RealtimeLuceneIndexReaderRefreshThread implements Runnable {
+  private static final Logger LOGGER = 
LoggerFactory.getLogger(SegmentColumnarIndexCreator.class);
+  // TODO: make this configurable and choose a higher default value
+  public static final int DELAY_BETWEEN_SUCCESSIVE_EXECUTION_MS_DEFAULT = 10;
+
+  private final ConcurrentLinkedQueue<RealtimeLuceneReadersForRealtimeSegment> 
_luceneRealtimeReaders;
+  private final Lock _mutex;
+  private final Condition _conditionVariable;
+
+  private volatile boolean _stopped = false;
+
+  RealtimeLuceneIndexReaderRefreshThread(
+      ConcurrentLinkedQueue<RealtimeLuceneReadersForRealtimeSegment> 
luceneRealtimeReaders,
+      Lock mutex, Condition conditionVariable) {
+    _luceneRealtimeReaders = luceneRealtimeReaders;
+    _mutex = mutex;
+    _conditionVariable = conditionVariable;
+  }
+
+  void setStopped() {
+    _stopped = true;
 
 Review comment:
   should also signal condition variable so that we get shutdown signal

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