n3nash commented on a change in pull request #600:  Timeline Service with 
Incremental View Syncing support
URL: https://github.com/apache/incubator-hudi/pull/600#discussion_r274219345
 
 

 ##########
 File path: 
hoodie-common/src/main/java/com/uber/hoodie/common/table/view/FileSystemViewManager.java
 ##########
 @@ -0,0 +1,197 @@
+/*
+ * Copyright (c) 2018 Uber Technologies, Inc. (hoodie-dev-gr...@uber.com)
+ *
+ * Licensed 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 com.uber.hoodie.common.table.view;
+
+import com.uber.hoodie.common.SerializableConfiguration;
+import com.uber.hoodie.common.table.HoodieTableMetaClient;
+import com.uber.hoodie.common.table.HoodieTimeline;
+import com.uber.hoodie.common.table.HoodieView;
+import com.uber.hoodie.common.util.Functions.Function2;
+import java.util.concurrent.ConcurrentHashMap;
+import org.apache.log4j.LogManager;
+import org.apache.log4j.Logger;
+
+/**
+ * A container that can potentially hold one or more dataset's
+ * file-system views. There is one view for each dataset. This is a view built 
against a timeline containing completed
+ * actions. In an embedded timeline-server mode, this typically holds only one 
dataset's view.
+ * In a stand-alone server mode, this can hold more than one dataset's views.
+ */
+public class FileSystemViewManager {
+  private static Logger logger = 
LogManager.getLogger(FileSystemViewManager.class);
+
+  private final SerializableConfiguration conf;
+  // The View Storage config used to store file-system views
+  private final FileSystemViewStorageConfig viewConfig;
+  // Map from Base-Path to View
+  private final ConcurrentHashMap<String, HoodieView> globalViewMap;
+  // Factory Map to create file-system views
+  private final Function2<String, FileSystemViewStorageConfig, HoodieView> 
viewCreator;
+
+  public FileSystemViewManager(SerializableConfiguration conf, 
FileSystemViewStorageConfig viewConfig,
+      Function2<String, FileSystemViewStorageConfig, HoodieView> viewCreator) {
+    this.conf = conf;
+    this.viewConfig = viewConfig;
+    this.globalViewMap = new ConcurrentHashMap<>();
+    this.viewCreator = viewCreator;
+  }
+
+  /**
+   * Drops reference to File-System Views. Future calls to view results in 
creating a new view
+   * @param basePath
+   */
+  public void clearFileSystemView(String basePath) {
+    HoodieView view = globalViewMap.remove(basePath);
+    if (view != null) {
+      view.close();
+    }
+  }
+
+  /**
+   * Main API to get the file-system view for the base-path
+   * @param basePath
+   * @return
+   */
+  public HoodieView getFileSystemView(String basePath) {
+    return globalViewMap.computeIfAbsent(basePath,
+        (path) -> viewCreator.apply(path, viewConfig));
+  }
+
+  /**
+   * Closes all views opened
+   */
+  public void close() {
+    this.globalViewMap.values().stream().forEach(v -> v.close());
+    this.globalViewMap.clear();
+  }
+
+  // FACTORY METHODS FOR CREATING FILE-SYSTEM VIEWS
+
+  /**
+   * Create RocksDB based file System view for a dataset
+   * @param conf Hadoop Configuration
+   * @param viewConf  View Storage Configuration
+   * @param basePath  Base Path of dataset
+   * @return
+   */
+  private static RocksDbBasedFileSystemView 
createRocksDBBasedFileSystemView(SerializableConfiguration conf,
+      FileSystemViewStorageConfig viewConf, String basePath) {
+    HoodieTableMetaClient metaClient = new HoodieTableMetaClient(conf.get(), 
basePath, true);
+    HoodieTimeline timeline = 
metaClient.getActiveTimeline().filterCompletedAndCompactionInstants();
+    return new RocksDbBasedFileSystemView(metaClient, timeline, viewConf);
+  }
+
+  /**
+   * Create a spillable Map based file System view for a dataset
+   * @param conf Hadoop Configuration
+   * @param viewConf  View Storage Configuration
+   * @param basePath  Base Path of dataset
+   * @return
+   */
+  private static SpillableMapBasedFileSystemView 
createSpillableMapBasedFileSystemView(SerializableConfiguration conf,
+      FileSystemViewStorageConfig viewConf, String basePath) {
+    logger.warn("Creating SpillableMap based view for basePath " + basePath);
+    HoodieTableMetaClient metaClient = new HoodieTableMetaClient(conf.get(), 
basePath, true);
+    HoodieTimeline timeline = 
metaClient.getActiveTimeline().filterCompletedAndCompactionInstants();
+    return new SpillableMapBasedFileSystemView(metaClient, timeline, viewConf);
+  }
+
+
+  /**
+   * Create an in-memory file System view for a dataset
+   * @param conf Hadoop Configuration
+   * @param viewConf  View Storage Configuration
+   * @param basePath  Base Path of dataset
+   * @return
+   */
+  private static HoodieTableFileSystemView 
createInMemoryFileSystemView(SerializableConfiguration conf,
+      FileSystemViewStorageConfig viewConf, String basePath) {
+    logger.warn("Creating InMemory based view for basePath " + basePath);
 
 Review comment:
   same here

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