com.uber.hoodie.io.compact.strategy.BoundedIOCompactionStrategy Maven / Gradle / Ivy

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/*
 *  Copyright (c) 2016 Uber Technologies, Inc. ([email protected])
 *
 *  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.io.compact.strategy;

import com.google.common.collect.Lists;
import com.uber.hoodie.config.HoodieWriteConfig;
import com.uber.hoodie.io.compact.CompactionOperation;
import java.util.List;

/**
 * CompactionStrategy which looks at total IO to be done for the compaction (read + write) and
 * limits the list of compactions to be under a configured limit on the IO
 *
 * @see CompactionStrategy
 */
public class BoundedIOCompactionStrategy extends CompactionStrategy {

  @Override
  public List orderAndFilter(HoodieWriteConfig writeConfig,
      List operations) {
    // Iterate through the operations in order and accept operations as long as we are within the
    // IO limit
    // Preserves the original ordering of compactions
    List finalOperations = Lists.newArrayList();
    long targetIORemaining = writeConfig.getTargetIOPerCompactionInMB();
    for (CompactionOperation op : operations) {
      long opIo = (Long) op.getMetrics().get(TOTAL_IO_MB);
      targetIORemaining -= opIo;
      finalOperations.add(op);
      if (targetIORemaining <= 0) {
        return finalOperations;
      }
    }
    return finalOperations;
  }
}