org.apache.gobblin.compaction.mapreduce.orc.OrcKeyDedupReducer.java Source code

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Here is the source code for org.apache.gobblin.compaction.mapreduce.orc.OrcKeyDedupReducer.java

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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.gobblin.compaction.mapreduce.orc;

import com.google.common.base.Optional;
import org.apache.gobblin.compaction.mapreduce.RecordKeyDedupReducerBase;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.NullWritable;
import org.apache.orc.mapred.OrcKey;
import org.apache.orc.mapred.OrcValue;

public class OrcKeyDedupReducer extends RecordKeyDedupReducerBase<OrcKey, OrcValue, NullWritable, OrcValue> {
    @Override
    protected void setOutValue(OrcValue valueToRetain) {
        // Better to copy instead reassigning reference.
        outValue.value = valueToRetain.value;
    }

    @Override
    protected void setOutKey(OrcValue valueToRetain) {
        // do nothing since initReusableObject has assigned value for outKey.
    }

    @Override
    protected void initDeltaComparator(Configuration conf) {
        deltaComparatorOptional = Optional.absent();
    }

    @Override
    protected void initReusableObject() {
        outKey = NullWritable.get();
        outValue = new OrcValue();
    }
}