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Subject [GitHub] BinShi-SecularBird commented on a change in pull request #425: PHOENIX-5069 Use asynchronous refresh to provide non-blocking Phoenix Stats Client Cache
Date Fri, 18 Jan 2019 22:58:21 GMT
BinShi-SecularBird 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_r249210005
 
 

 ##########
 File path: phoenix-core/src/main/java/org/apache/phoenix/query/PhoenixStatsLoader.java
 ##########
 @@ -0,0 +1,57 @@
+/*
+ * 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 org.apache.phoenix.schema.stats.GuidePostsInfo;
+import org.apache.phoenix.schema.stats.GuidePostsKey;
+
+/**
+ * The interface for talking to underneath layers to load stats from stats table for a given
key
+ */
+public interface PhoenixStatsLoader {
+    /**
+     * Use to check whether this is the time to load stats from stats table.
+     * There are two cases:
+     * a. After a specified duration has passed
+     * b. The stats on server side (e.g. in stats table) has been updated
+     *
+     * @return boolean indicates whether we need to load stats or not
+     */
+    boolean needsLoad();
+
+    /**
+     * Called by client stats cache to load stats from underneath layers
+     *
+     * @param statsKey the stats key used to search the stats on server side (in stats table)
+     * @throws Exception
+     *
+     * @return GuidePostsInfo retrieved from sever side
+     */
+    GuidePostsInfo loadStats(GuidePostsKey statsKey) throws Exception;
 
 Review comment:
   Yes. Any strong reason for not to do so?

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