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From omalley <...@git.apache.org>
Subject [GitHub] orc pull request: ORC-52. Create ORC InputFormat and OutputFormat implementa...
Date Tue, 31 May 2016 23:59:00 GMT
Github user omalley commented on a diff in the pull request:

    https://github.com/apache/orc/pull/27#discussion_r65283394
  
    --- Diff: java/mapreduce/src/java/org.apache.orc.mapreduce/OrcInputFormat.java ---
    @@ -0,0 +1,95 @@
    +/**
    + * 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 com.esotericsoftware.kryo.Kryo;
    +import com.esotericsoftware.kryo.io.Input;
    +import org.apache.commons.codec.binary.Base64;
    +import org.apache.hadoop.conf.Configuration;
    +import org.apache.hadoop.hive.ql.io.sarg.SearchArgument;
    +import org.apache.hadoop.hive.ql.io.sarg.SearchArgumentImpl;
    +import org.apache.hadoop.io.Writable;
    +import org.apache.hadoop.mapreduce.InputSplit;
    +import org.apache.hadoop.mapreduce.RecordReader;
    +import org.apache.hadoop.mapreduce.TaskAttemptContext;
    +import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
    +import org.apache.hadoop.mapreduce.lib.input.FileSplit;
    +
    +  
    +import java.io.IOException;
    +
    +import org.apache.hadoop.io.NullWritable;
    +import org.apache.orc.OrcConf;
    +import org.apache.orc.OrcFile;
    +import org.apache.orc.Reader;
    +import org.apache.orc.TypeDescription;
    +
    +/**
    + * An ORC input format that satisfies the org.apache.hadoop.mapreduce API.
    + */
    +public class OrcInputFormat<V extends Writable>
    +    extends FileInputFormat<NullWritable, V> {
    +
    +  /**
    +   * Put the given SearchArgument into the configuration for an OrcInputFormat.
    +   * @param conf the configuration to modify
    +   * @param sarg the SearchArgument to put in the configuration
    +   * @param columnNames the list of column names for the SearchArgument
    +   */
    +  public static void setSearchArgument(Configuration conf,
    +                                       SearchArgument sarg,
    +                                       String[] columnNames) {
    +    org.apache.orc.mapred.OrcInputFormat.setSearchArgument(conf, sarg,
    +        columnNames);
    +  }
    +
    +  @Override
    +  public RecordReader<NullWritable, V>
    +      createRecordReader(InputSplit inputSplit,
    +                         TaskAttemptContext taskAttemptContext
    +                         ) throws IOException, InterruptedException {
    +    FileSplit split = (FileSplit) inputSplit;
    +    Configuration conf = taskAttemptContext.getConfiguration();
    +    Reader file = OrcFile.createReader(split.getPath(),
    +        OrcFile.readerOptions(conf)
    +            .maxLength(OrcConf.MAX_FILE_LENGTH.getLong(conf)));
    +    TypeDescription schema =
    +        TypeDescription.fromString(OrcConf.SCHEMA.getString(conf));
    +    Reader.Options options = new Reader.Options()
    +        .range(split.getStart(), split.getLength())
    +        .useZeroCopy(OrcConf.USE_ZEROCOPY.getBoolean(conf))
    +        .skipCorruptRecords(OrcConf.SKIP_CORRUPT_DATA.getBoolean(conf));
    --- End diff --
    
    Yeah, let me figure out how to merge the common code.


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