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From wagnermarkd <...@git.apache.org>
Subject [GitHub] orc pull request: ORC-52. Create ORC InputFormat and OutputFormat implementa...
Date Tue, 31 May 2016 22:32:48 GMT
Github user wagnermarkd commented on a diff in the pull request:

    https://github.com/apache/orc/pull/27#discussion_r65275023
  
    --- Diff: java/mapreduce/src/test/org/apache/orc/mapreduce/TestMrUnit.java ---
    @@ -0,0 +1,202 @@
    +/**
    + * 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.orc.mapreduce;
    +
    +import org.apache.hadoop.io.IntWritable;
    +import org.apache.hadoop.io.NullWritable;
    +import org.apache.hadoop.io.Text;
    +import org.apache.hadoop.io.serializer.Deserializer;
    +import org.apache.hadoop.io.serializer.Serialization;
    +import org.apache.hadoop.io.serializer.Serializer;
    +import org.apache.hadoop.io.serializer.WritableSerialization;
    +import org.apache.hadoop.mapred.JobConf;
    +import org.apache.hadoop.mapreduce.Mapper;
    +import org.apache.hadoop.mapreduce.Reducer;
    +import org.apache.hadoop.mrunit.mapreduce.MapReduceDriver;
    +import org.apache.orc.TypeDescription;
    +import org.apache.orc.mapred.OrcKey;
    +import org.apache.orc.mapred.OrcStruct;
    +import org.apache.orc.mapred.OrcValue;
    +import org.junit.Test;
    +
    +import java.io.DataInputStream;
    +import java.io.DataOutputStream;
    +import java.io.IOException;
    +import java.io.InputStream;
    +import java.io.OutputStream;
    +import java.util.Iterator;
    +
    +public class TestMrUnit {
    +  JobConf conf = new JobConf();
    +
    +  /**
    +   * Split the input struct into its two parts.
    +   */
    +  public static class MyMapper
    +      extends Mapper<NullWritable, OrcStruct, OrcKey, OrcValue> {
    +    private OrcKey keyWrapper = new OrcKey();
    +    private OrcValue valueWrapper = new OrcValue();
    +
    +    @Override
    +    protected void map(NullWritable key,
    +                       OrcStruct value,
    +                       Context context
    +                       ) throws IOException, InterruptedException {
    +      keyWrapper.key = value.getFieldValue(0);
    +      valueWrapper.value = value.getFieldValue(1);
    +      context.write(keyWrapper, valueWrapper);
    +    }
    +  }
    +
    +  /**
    +   * Glue the key and values back together.
    +   */
    +  public static class MyReducer
    +      extends Reducer<OrcKey, OrcValue, NullWritable, OrcStruct> {
    +    private OrcStruct output = new OrcStruct(TypeDescription.fromString
    +        ("struct<first:struct<x:int,y:int>,second:struct<z:string>>"));
    +    private final NullWritable nada = NullWritable.get();
    +
    +    @Override
    +    protected void reduce(OrcKey key,
    +                          Iterable<OrcValue> values,
    +                          Context context
    +                          ) throws IOException, InterruptedException {
    +      output.setFieldValue(0, key.key);
    +      for(OrcValue value: values) {
    +        output.setFieldValue(1, value.value);
    +        context.write(nada, output);
    +      }
    +    }
    +  }
    +
    +  /**
    +   * This class is intended to support MRUnit's object copying for input and
    +   * output objects.
    +   *
    +   * Real mapreduce contexts should NEVER use this class.
    --- End diff --
    
    Isn't there the same challenge for true MR contexts? The reducer needs to be aware of
the schema for the values which it is serializing. Orc


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