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Subject [GitHub] karanmehta93 commented on a change in pull request #425: PHOENIX-5069 Use asynchronous refresh to provide non-blocking Phoenix Stats Client Cache
Date Thu, 17 Jan 2019 19:29:55 GMT
karanmehta93 commented on a change in pull request #425: PHOENIX-5069 Use asynchronous refresh
to provide non-blocking Phoenix Stats Client Cache
URL: https://github.com/apache/phoenix/pull/425#discussion_r248809669
 
 

 ##########
 File path: phoenix-core/src/test/java/org/apache/phoenix/query/PhoenixStatsCacheLoaderTest.java
 ##########
 @@ -0,0 +1,153 @@
+/*
+ * 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.phoenix.query;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import com.google.common.cache.CacheBuilder;
+import com.google.common.cache.LoadingCache;
+import com.google.common.cache.Weigher;
+import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
+import org.apache.phoenix.schema.stats.GuidePostsInfo;
+import org.apache.phoenix.schema.stats.GuidePostsKey;
+import org.apache.phoenix.util.ByteUtil;
+import org.junit.Test;
+
+import java.lang.Thread;
+import java.util.Collections;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.ExecutorService;
+
+/**
+ * Test class around the PhoenixStatsCacheLoader.
+ */
+public class PhoenixStatsCacheLoaderTest {
+    /**
+     * {@link PhoenixStatsLoader} test implementation for the Stats Loader.
+     */
+    protected class TestStatsLoaderImpl implements PhoenixStatsLoader {
+        private int maxLength = 1;
+        private final CountDownLatch firstTimeRefreshedSignal;
 
 Review comment:
   You can instead initialize this latch with value more than 1.

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