[HUDI-1335] Introduce FlinkHoodieSimpleIndex to hudi-flink-client

hudi-client/hudi-flink-client/src/main/java/org/apache/hudi/index/FlinkHoodieIndex.java

@@ -29,6 +29,7 @@
 import org.apache.hudi.common.util.StringUtils;
 import org.apache.hudi.config.HoodieWriteConfig;
 import org.apache.hudi.exception.HoodieIndexException;
+import org.apache.hudi.index.simple.FlinkHoodieSimpleIndex;
 import org.apache.hudi.index.bloom.FlinkHoodieBloomIndex;
 import org.apache.hudi.index.state.FlinkInMemoryStateIndex;
 import org.apache.hudi.PublicAPIMethod;
@@ -61,6 +62,8 @@ public static FlinkHoodieIndex createIndex(HoodieFlinkEngineContext context, Hoo
         return new FlinkInMemoryStateIndex<>(context, config);
       case BLOOM:
         return new FlinkHoodieBloomIndex(config);
+      case SIMPLE:
+        return new FlinkHoodieSimpleIndex<>(config);
       default:
         throw new HoodieIndexException("Unsupported index type " + config.getIndexType());
     }

hudi-client/hudi-flink-client/src/main/java/org/apache/hudi/index/simple/FlinkHoodieSimpleIndex.java

@@ -0,0 +1,142 @@
+/*
+ * 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.hudi.index.simple;
+
+import org.apache.hudi.client.WriteStatus;
+import org.apache.hudi.common.engine.HoodieEngineContext;
+import org.apache.hudi.common.model.HoodieBaseFile;
+import org.apache.hudi.common.model.HoodieKey;
+import org.apache.hudi.common.model.HoodieRecord;
+import org.apache.hudi.common.model.HoodieRecordLocation;
+import org.apache.hudi.common.model.HoodieRecordPayload;
+import org.apache.hudi.common.util.Option;
+import org.apache.hudi.common.util.collection.Pair;
+import org.apache.hudi.config.HoodieWriteConfig;
+import org.apache.hudi.exception.HoodieIndexException;
+import org.apache.hudi.index.FlinkHoodieIndex;
+import org.apache.hudi.index.HoodieIndexUtils;
+import org.apache.hudi.io.HoodieKeyLocationFetchHandle;
+import org.apache.hudi.table.HoodieTable;
+
+import avro.shaded.com.google.common.collect.Lists;
+
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+import static org.apache.hudi.index.HoodieIndexUtils.getLatestBaseFilesForAllPartitions;
+
+/**
+ * A simple index which reads interested fields(record key and partition path) from base files and
+ * compares with incoming records to find the tagged location.
+ *
+ * @param <T> type of payload
+ */
+public class FlinkHoodieSimpleIndex<T extends HoodieRecordPayload> extends FlinkHoodieIndex<T> {
+
+  public FlinkHoodieSimpleIndex(HoodieWriteConfig config) {
+    super(config);
+  }
+
+  @Override
+  public List<WriteStatus> updateLocation(List<WriteStatus> writeStatuses, HoodieEngineContext context,
+                                          HoodieTable<T, List<HoodieRecord<T>>, List<HoodieKey>, List<WriteStatus>> hoodieTable) throws HoodieIndexException {
+    return writeStatuses;
+  }
+
+  @Override
+  public boolean rollbackCommit(String instantTime) {
+    return true;
+  }
+
+  @Override
+  public boolean isGlobal() {
+    return false;
+  }
+
+  @Override
+  public boolean canIndexLogFiles() {
+    return false;
+  }
+
+  @Override
+  public boolean isImplicitWithStorage() {
+    return true;
+  }
+
+  @Override
+  public List<HoodieRecord<T>> tagLocation(List<HoodieRecord<T>> hoodieRecords, HoodieEngineContext context,
+                                           HoodieTable<T, List<HoodieRecord<T>>, List<HoodieKey>, List<WriteStatus>> hoodieTable) throws HoodieIndexException {
+    return tagLocationInternal(hoodieRecords, context, hoodieTable);
+  }
+
+  /**
+   * Tags records location for incoming records.
+   */
+  private List<HoodieRecord<T>> tagLocationInternal(List<HoodieRecord<T>> hoodieRecords, HoodieEngineContext context,
+                                                    HoodieTable<T, List<HoodieRecord<T>>, List<HoodieKey>, List<WriteStatus>> hoodieTable) {
+    Map<HoodieKey, HoodieRecord<T>> keyedInputRecords = context.mapToPair(hoodieRecords, record -> Pair.of(record.getKey(), record), 0);
+    Map<HoodieKey, HoodieRecordLocation> existingLocationsOnTable = fetchRecordLocationsForAffectedPartitions(keyedInputRecords.keySet(), context, hoodieTable, config.getSimpleIndexParallelism());
+    List<HoodieRecord<T>> taggedRecords = new LinkedList<>();
+
+    for (Map.Entry<HoodieKey, HoodieRecord<T>> hoodieKeyHoodieRecordEntry : keyedInputRecords.entrySet()) {
+      HoodieKey key = hoodieKeyHoodieRecordEntry.getKey();
+      HoodieRecord<T> record = hoodieKeyHoodieRecordEntry.getValue();
+      if (existingLocationsOnTable.containsKey(key)) {
+        taggedRecords.add(HoodieIndexUtils.getTaggedRecord(record, Option.ofNullable(existingLocationsOnTable.get(key))));
+      }
+    }
+    return taggedRecords;
+  }
+
+  /**
+   * Fetch record locations for passed in {@link HoodieKey}s.
+   *
+   * @param keySet      {@link HoodieKey}s for which locations are fetched
+   * @param context     instance of {@link HoodieEngineContext} to use
+   * @param hoodieTable instance of {@link HoodieTable} of interest
+   * @param parallelism parallelism to use
+   * @return {@link Map} of {@link HoodieKey} and {@link HoodieRecordLocation}
+   */
+  private Map<HoodieKey, HoodieRecordLocation> fetchRecordLocationsForAffectedPartitions(Set<HoodieKey> keySet,
+                                                                                         HoodieEngineContext context,
+                                                                                         HoodieTable<T, List<HoodieRecord<T>>, List<HoodieKey>, List<WriteStatus>> hoodieTable,
+                                                                                         int parallelism) {
+    List<String> affectedPartitionPathList = keySet.stream().map(HoodieKey::getPartitionPath).distinct().collect(Collectors.toList());
+    List<Pair<String, HoodieBaseFile>> latestBaseFiles = getLatestBaseFilesForAllPartitions(affectedPartitionPathList, context, hoodieTable);
+    return fetchRecordLocations(context, hoodieTable, parallelism, latestBaseFiles);
+  }
+
+  private Map<HoodieKey, HoodieRecordLocation> fetchRecordLocations(HoodieEngineContext context,
+                                                                    HoodieTable<T, List<HoodieRecord<T>>, List<HoodieKey>, List<WriteStatus>> hoodieTable,
+                                                                    int parallelism,
+                                                                    List<Pair<String, HoodieBaseFile>> latestBaseFiles) {
+
+    List<HoodieKeyLocationFetchHandle<T, List<HoodieRecord<T>>, List<HoodieKey>, List<WriteStatus>>> hoodieKeyLocationFetchHandles =
+        context.map(latestBaseFiles, partitionPathBaseFile -> new HoodieKeyLocationFetchHandle<>(config, hoodieTable, partitionPathBaseFile), parallelism);
+    Map<HoodieKey, HoodieRecordLocation> recordLocations = new HashMap<>();
+    hoodieKeyLocationFetchHandles.stream()
+        .flatMap(handle -> Lists.newArrayList(handle.locations()).stream())
+        .forEach(x -> x.forEach(y -> recordLocations.put(y.getKey(), y.getRight())));
+    return recordLocations;
+  }
+}