org.apache.hadoop.hive.ql.exec.BinaryRecordReader Maven / Gradle / Ivy
/**
* 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.hive.ql.exec;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.hive.conf.HiveConf;
/**
* Read from a binary stream and treat each 1000 bytes (configurable via
* hive.binary.record.max.length) as a record. The last record before the
* end of stream can have less than 1000 bytes.
*/
public class BinaryRecordReader implements RecordReader {
private InputStream in;
private BytesWritable bytes;
private int maxRecordLength;
public void initialize(InputStream in, Configuration conf, Properties tbl) throws IOException {
this.in = in;
maxRecordLength = HiveConf.getIntVar(conf, HiveConf.ConfVars.HIVEBINARYRECORDMAX);
}
public Writable createRow() throws IOException {
bytes = new BytesWritable();
bytes.setCapacity(maxRecordLength);
return bytes;
}
public int next(Writable row) throws IOException {
int recordLength = in.read(bytes.get(), 0, maxRecordLength);
if (recordLength >= 0) {
bytes.setSize(recordLength);
}
return recordLength;
}
public void close() throws IOException {
if (in != null) {
in.close();
}
}
}