org.apache.hadoop.hbase.mapreduce.ResultSerialization Maven / Gradle / Ivy
The newest version!
/**
* 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.hadoop.hbase.mapreduce;
import java.io.DataInput;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.classification.InterfaceStability;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.protobuf.ProtobufUtil;
import org.apache.hadoop.hbase.protobuf.generated.ClientProtos;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.io.serializer.Deserializer;
import org.apache.hadoop.io.serializer.Serialization;
import org.apache.hadoop.io.serializer.Serializer;
@InterfaceAudience.Public
@InterfaceStability.Evolving
public class ResultSerialization extends Configured implements Serialization {
private static final Log LOG = LogFactory.getLog(ResultSerialization.class);
// The following configuration property indicates import file format version.
public static final String IMPORT_FORMAT_VER = "hbase.import.version";
@Override
public boolean accept(Class> c) {
return Result.class.isAssignableFrom(c);
}
@Override
public Deserializer getDeserializer(Class c) {
// check input format version
Configuration conf = getConf();
if (conf != null) {
String inputVersion = conf.get(IMPORT_FORMAT_VER);
if (inputVersion != null && inputVersion.equals("0.94")) {
LOG.info("Load exported file using deserializer for HBase 0.94 format");
return new Result94Deserializer();
}
}
return new ResultDeserializer();
}
@Override
public Serializer getSerializer(Class c) {
return new ResultSerializer();
}
/**
* The following deserializer class is used to load exported file of 0.94
*/
private static class Result94Deserializer implements Deserializer {
private DataInputStream in;
@Override
public void close() throws IOException {
in.close();
}
@Override
public Result deserialize(Result mutation) throws IOException {
int totalBuffer = in.readInt();
if (totalBuffer == 0) {
return Result.EMPTY_RESULT;
}
byte[] buf = new byte[totalBuffer];
readChunked(in, buf, 0, totalBuffer);
List kvs = new ArrayList();
int offset = 0;
while (offset < totalBuffer) {
int keyLength = Bytes.toInt(buf, offset);
offset += Bytes.SIZEOF_INT;
kvs.add(new KeyValue(buf, offset, keyLength));
offset += keyLength;
}
return Result.create(kvs);
}
@Override
public void open(InputStream in) throws IOException {
if (!(in instanceof DataInputStream)) {
throw new IOException("Wrong input stream instance passed in");
}
this.in = (DataInputStream) in;
}
private void readChunked(final DataInput in, byte[] dest, int ofs, int len) throws IOException {
int maxRead = 8192;
for (; ofs < len; ofs += maxRead)
in.readFully(dest, ofs, Math.min(len - ofs, maxRead));
}
}
private static class ResultDeserializer implements Deserializer {
private InputStream in;
@Override
public void close() throws IOException {
in.close();
}
@Override
public Result deserialize(Result mutation) throws IOException {
ClientProtos.Result.Builder builder = ClientProtos.Result.newBuilder();
ProtobufUtil.mergeDelimitedFrom(builder, in);
ClientProtos.Result proto = builder.build();
return ProtobufUtil.toResult(proto);
}
@Override
public void open(InputStream in) throws IOException {
this.in = in;
}
}
private static class ResultSerializer implements Serializer {
private OutputStream out;
@Override
public void close() throws IOException {
out.close();
}
@Override
public void open(OutputStream out) throws IOException {
this.out = out;
}
@Override
public void serialize(Result result) throws IOException {
ProtobufUtil.toResult(result).writeDelimitedTo(out);
}
}
}
| |
© 2015 - 2024 Weber Informatics LLC | Privacy Policy