/**
* 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.hadoop.hive.llap.LlapDaemonInfo;
import org.apache.hadoop.hive.ql.exec.MemoryMonitorInfo;
import org.apache.hadoop.hive.ql.exec.mapjoin.MapJoinMemoryExhaustionError;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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.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 Logger LOG = LoggerFactory.getLogger(VectorMapJoinFastHashTableLoader.class.getName());
private Configuration hconf;
protected MapJoinDesc desc;
private TezContext tezContext;
private String cacheKey;
@Override
public void init(ExecMapperContext context, MapredContext mrContext,
Configuration hconf, MapJoinOperator joinOp) {
this.tezContext = (TezContext) mrContext;
this.hconf = hconf;
this.desc = joinOp.getConf();
this.cacheKey = joinOp.getCacheKey();
}
@Override
public void load(MapJoinTableContainer[] mapJoinTables,
MapJoinTableContainerSerDe[] mapJoinTableSerdes)
throws HiveException {
Map<Integer, String> parentToInput = desc.getParentToInput();
Map<Integer, Long> parentKeyCounts = desc.getParentKeyCounts();
MemoryMonitorInfo memoryMonitorInfo = desc.getMemoryMonitorInfo();
boolean doMemCheck = false;
long effectiveThreshold = 0;
if (memoryMonitorInfo != null) {
effectiveThreshold = memoryMonitorInfo.getEffectiveThreshold(desc.getMaxMemoryAvailable());
// hash table loading happens in server side, LlapDecider could kick out some fragments to run outside of LLAP.
// Flip the flag at runtime in case if we are running outside of LLAP
if (!LlapDaemonInfo.INSTANCE.isLlap()) {
memoryMonitorInfo.setLlap(false);
}
if (memoryMonitorInfo.doMemoryMonitoring()) {
doMemCheck = true;
if (LOG.isInfoEnabled()) {
LOG.info("Memory monitoring for hash table loader enabled. {}", memoryMonitorInfo);
}
}
}
if (!doMemCheck) {
if (LOG.isInfoEnabled()) {
LOG.info("Not doing hash table memory monitoring. {}", memoryMonitorInfo);
}
}
for (int pos = 0; pos < mapJoinTables.length; pos++) {
if (pos == desc.getPosBigTable()) {
continue;
}
long numEntries = 0;
String inputName = parentToInput.get(pos);
LogicalInput input = tezContext.getInput(inputName);
try {
input.start();
tezContext.getTezProcessorContext().waitForAnyInputReady(
Collections.<Input> 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);
LOG.info("Loading hash table for input: {} cacheKey: {} tableContainer: {} smallTablePos: {}", inputName,
cacheKey, vectorMapJoinFastTableContainer.getClass().getSimpleName(), pos);
vectorMapJoinFastTableContainer.setSerde(null, null); // No SerDes here.
while (kvReader.next()) {
vectorMapJoinFastTableContainer.putRow((BytesWritable)kvReader.getCurrentKey(),
(BytesWritable)kvReader.getCurrentValue());
numEntries++;
if (doMemCheck && (numEntries % memoryMonitorInfo.getMemoryCheckInterval() == 0)) {
final long estMemUsage = vectorMapJoinFastTableContainer.getEstimatedMemorySize();
if (estMemUsage > effectiveThreshold) {
String msg = "Hash table loading exceeded memory limits for input: " + inputName +
" numEntries: " + numEntries + " estimatedMemoryUsage: " + estMemUsage +
" effectiveThreshold: " + effectiveThreshold + " memoryMonitorInfo: " + memoryMonitorInfo;
LOG.error(msg);
throw new MapJoinMemoryExhaustionError(msg);
} else {
if (LOG.isInfoEnabled()) {
LOG.info("Checking hash table loader memory usage for input: {} numEntries: {} " +
"estimatedMemoryUsage: {} effectiveThreshold: {}", inputName, numEntries, estMemUsage,
effectiveThreshold);
}
}
}
}
vectorMapJoinFastTableContainer.seal();
mapJoinTables[pos] = vectorMapJoinFastTableContainer;
if (doMemCheck) {
LOG.info("Finished loading hash table for input: {} cacheKey: {} numEntries: {} " +
"estimatedMemoryUsage: {}", inputName, cacheKey, numEntries,
vectorMapJoinFastTableContainer.getEstimatedMemorySize());
} else {
LOG.info("Finished loading hash table for input: {} cacheKey: {} numEntries: {}", inputName, cacheKey,
numEntries);
}
} catch (IOException e) {
throw new HiveException(e);
} catch (SerDeException e) {
throw new HiveException(e);
} catch (Exception e) {
throw new HiveException(e);
}
}
}
}