org.apache.hadoop.hive.ql.exec.tez.MapRecordSource Maven / Gradle / Ivy
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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
*
* 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.tez;
import java.io.IOException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hive.ql.exec.MapOperator;
import org.apache.hadoop.hive.ql.exec.mr.ExecMapperContext;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.util.StringUtils;
import org.apache.tez.runtime.library.api.KeyValueReader;
/**
* Process input from tez LogicalInput and write output - for a map plan Just pump the records
* through the query plan.
*/
public class MapRecordSource implements RecordSource {
public static final Log LOG = LogFactory.getLog(MapRecordSource.class);
private ExecMapperContext execContext = null;
private MapOperator mapOp = null;
private KeyValueReader reader = null;
private final boolean grouped = false;
void init(JobConf jconf, MapOperator mapOp, KeyValueReader reader) throws IOException {
execContext = mapOp.getExecContext();
this.mapOp = mapOp;
this.reader = reader;
}
@Override
public final boolean isGrouped() {
return grouped;
}
@Override
public boolean pushRecord() throws HiveException {
execContext.resetRow();
try {
if (reader.next()) {
Object value;
try {
value = reader.getCurrentValue();
} catch (IOException e) {
throw new HiveException(e);
}
return processRow(value);
}
} catch (IOException e) {
throw new HiveException(e);
}
return false;
}
private boolean processRow(Object value) {
try {
if (mapOp.getDone()) {
return false; // done
} else {
// Since there is no concept of a group, we don't invoke
// startGroup/endGroup for a mapper
mapOp.process((Writable) value);
}
} catch (Throwable e) {
if (e instanceof OutOfMemoryError) {
// Don't create a new object if we are already out of memory
throw (OutOfMemoryError) e;
} else {
LOG.fatal(StringUtils.stringifyException(e));
throw new RuntimeException(e);
}
}
return true; // give me more
}
}