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CompressionWriter.java
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CompressionWriter.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
* <p/>
* http://www.apache.org/licenses/LICENSE-2.0
* <p/>
* 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.examples;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.ql.exec.vector.BytesColumnVector;
import org.apache.hadoop.hive.ql.exec.vector.LongColumnVector;
import org.apache.hadoop.hive.ql.exec.vector.VectorizedRowBatch;
import org.apache.orc.OrcFile;
import org.apache.orc.OrcFile.WriterOptions;
import org.apache.orc.TypeDescription;
import org.apache.orc.Writer;
import java.io.IOException;
import static org.apache.orc.CompressionKind.SNAPPY;
public class CompressionWriter {
public static void main(Configuration conf, String[] args) throws IOException {
TypeDescription schema = TypeDescription.fromString("struct<x:int,y:string>");
// Set compress kind to snappy. Now we have much compression
// method such as ZLIB, SNAPPY, LZO, LZ4, ZSTD.
WriterOptions options = OrcFile.writerOptions(conf).setSchema(schema).compress(SNAPPY);
Writer snappyWriter = OrcFile.createWriter(new Path("compressed.orc"), options);
VectorizedRowBatch batch = schema.createRowBatch();
LongColumnVector x = (LongColumnVector) batch.cols[0];
BytesColumnVector y = (BytesColumnVector) batch.cols[1];
for (int r = 0; r < 10000; ++r) {
int row = batch.size++;
x.vector[row] = r;
byte[] buffer = ("byte-" + r).getBytes();
y.setRef(row, buffer, 0, buffer.length);
// If the batch is full, write it out and start over.
if (batch.size == batch.getMaxSize()) {
snappyWriter.addRowBatch(batch);
batch.reset();
}
}
if (batch.size != 0) {
snappyWriter.addRowBatch(batch);
}
snappyWriter.close();
}
public static void main(String[] args) throws IOException {
main(new Configuration(), args);
}
}