org.apache.hudi.index.InMemoryHashIndex Maven / Gradle / Ivy

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/*
 * 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;

import org.apache.hudi.client.WriteStatus;
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.table.HoodieTable;

import org.apache.spark.api.java.JavaPairRDD;
import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.api.java.function.Function;
import org.apache.spark.api.java.function.Function2;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

/**
 * Hoodie Index implementation backed by an in-memory Hash map.
 * 
 * ONLY USE FOR LOCAL TESTING
 */
public class InMemoryHashIndex extends HoodieIndex {

  private static ConcurrentMap recordLocationMap;

  public InMemoryHashIndex(HoodieWriteConfig config) {
    super(config);
    synchronized (InMemoryHashIndex.class) {
      if (recordLocationMap == null) {
        recordLocationMap = new ConcurrentHashMap<>();
      }
    }
  }

  @Override
  public JavaPairRDD>> fetchRecordLocation(JavaRDD hoodieKeys,
      JavaSparkContext jsc, HoodieTable hoodieTable) {
    throw new UnsupportedOperationException("InMemory index does not implement check exist yet");
  }

  @Override
  public JavaRDD> tagLocation(JavaRDD> recordRDD, JavaSparkContext jsc,
      HoodieTable hoodieTable) {
    return recordRDD.mapPartitionsWithIndex(this.new LocationTagFunction(), true);
  }

  @Override
  public JavaRDD updateLocation(JavaRDD writeStatusRDD, JavaSparkContext jsc,
      HoodieTable hoodieTable) {
    return writeStatusRDD.map(new Function() {
      @Override
      public WriteStatus call(WriteStatus writeStatus) {
        for (HoodieRecord record : writeStatus.getWrittenRecords()) {
          if (!writeStatus.isErrored(record.getKey())) {
            HoodieKey key = record.getKey();
            Option newLocation = record.getNewLocation();
            if (newLocation.isPresent()) {
              recordLocationMap.put(key, newLocation.get());
            } else {
              // Delete existing index for a deleted record
              recordLocationMap.remove(key);
            }
          }
        }
        return writeStatus;
      }
    });
  }

  @Override
  public boolean rollbackCommit(String instantTime) {
    return true;
  }

  /**
   * Only looks up by recordKey.
   */
  @Override
  public boolean isGlobal() {
    return true;
  }

  /**
   * Mapping is available in HBase already.
   */
  @Override
  public boolean canIndexLogFiles() {
    return true;
  }

  /**
   * Index needs to be explicitly updated after storage write.
   */
  @Override
  public boolean isImplicitWithStorage() {
    return false;
  }

  /**
   * Function that tags each HoodieRecord with an existing location, if known.
   */
  class LocationTagFunction implements Function2>, Iterator>> {

    @Override
    public Iterator> call(Integer partitionNum, Iterator> hoodieRecordIterator) {
      List> taggedRecords = new ArrayList<>();
      while (hoodieRecordIterator.hasNext()) {
        HoodieRecord rec = hoodieRecordIterator.next();
        if (recordLocationMap.containsKey(rec.getKey())) {
          rec.unseal();
          rec.setCurrentLocation(recordLocationMap.get(rec.getKey()));
          rec.seal();
        }
        taggedRecords.add(rec);
      }
      return taggedRecords.iterator();
    }
  }
}