org.apache.hadoop.hive.ql.exec.vector.mapjoin.fast.VectorMapJoinFastHashTableLoader 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.vector.mapjoin.fast;
import java.io.IOException;
import java.util.Collections;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.ql.exec.MapJoinOperator;
import org.apache.hadoop.hive.ql.exec.MapredContext;
import org.apache.hadoop.hive.ql.exec.mr.ExecMapperContext;
import org.apache.hadoop.hive.ql.exec.persistence.HashMapWrapper;
import org.apache.hadoop.hive.ql.exec.persistence.MapJoinTableContainer;
import org.apache.hadoop.hive.ql.exec.persistence.MapJoinTableContainerSerDe;
import org.apache.hadoop.hive.ql.exec.tez.TezContext;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.plan.MapJoinDesc;
import org.apache.hadoop.hive.serde2.SerDeException;
import org.apache.hadoop.io.BytesWritable;
import org.apache.tez.runtime.api.Input;
import org.apache.tez.runtime.api.LogicalInput;
import org.apache.tez.runtime.library.api.KeyValueReader;
/**
* HashTableLoader for Tez constructs the hashtable from records read from
* a broadcast edge.
*/
public class VectorMapJoinFastHashTableLoader implements org.apache.hadoop.hive.ql.exec.HashTableLoader {
private static final Log LOG = LogFactory.getLog(VectorMapJoinFastHashTableLoader.class.getName());
private Configuration hconf;
protected MapJoinDesc desc;
private TezContext tezContext;
@Override
public void init(ExecMapperContext context, MapredContext mrContext,
Configuration hconf, MapJoinOperator joinOp) {
this.tezContext = (TezContext) mrContext;
this.hconf = hconf;
this.desc = joinOp.getConf();
}
@Override
public void load(MapJoinTableContainer[] mapJoinTables,
MapJoinTableContainerSerDe[] mapJoinTableSerdes)
throws HiveException {
Map parentToInput = desc.getParentToInput();
Map parentKeyCounts = desc.getParentKeyCounts();
for (int pos = 0; pos < mapJoinTables.length; pos++) {
if (pos == desc.getPosBigTable()) {
continue;
}
String inputName = parentToInput.get(pos);
LogicalInput input = tezContext.getInput(inputName);
try {
input.start();
tezContext.getTezProcessorContext().waitForAnyInputReady(
Collections. singletonList(input));
} catch (Exception e) {
throw new HiveException(e);
}
try {
KeyValueReader kvReader = (KeyValueReader) input.getReader();
Long keyCountObj = parentKeyCounts.get(pos);
long keyCount = (keyCountObj == null) ? -1 : keyCountObj.longValue();
VectorMapJoinFastTableContainer vectorMapJoinFastTableContainer =
new VectorMapJoinFastTableContainer(desc, hconf, keyCount);
while (kvReader.next()) {
vectorMapJoinFastTableContainer.putRow(
null, (BytesWritable) kvReader.getCurrentKey(),
null, (BytesWritable) kvReader.getCurrentValue());
}
vectorMapJoinFastTableContainer.seal();
mapJoinTables[pos] = (MapJoinTableContainer) vectorMapJoinFastTableContainer;
} catch (IOException e) {
throw new HiveException(e);
} catch (SerDeException e) {
throw new HiveException(e);
} catch (Exception e) {
throw new HiveException(e);
}
}
}
}