/**
* 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.BufferedOutputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.Serializable;
import java.util.Set;
import org.apache.commons.io.FileExistsException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.ql.CompilationOpContext;
import org.apache.hadoop.hive.ql.exec.persistence.MapJoinPersistableTableContainer;
import org.apache.hadoop.hive.ql.exec.persistence.MapJoinTableContainerSerDe;
import org.apache.hadoop.hive.ql.log.PerfLogger;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.plan.BucketMapJoinContext;
import org.apache.hadoop.hive.ql.plan.MapredLocalWork;
import org.apache.hadoop.hive.ql.plan.SparkBucketMapJoinContext;
import org.apache.hadoop.hive.ql.plan.SparkHashTableSinkDesc;
import org.apache.hadoop.hive.ql.plan.api.OperatorType;
import org.apache.hadoop.hive.ql.session.SessionState;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class SparkHashTableSinkOperator
extends TerminalOperator<SparkHashTableSinkDesc> implements Serializable {
private static final long serialVersionUID = 1L;
private final String CLASS_NAME = this.getClass().getName();
private final transient PerfLogger perfLogger = SessionState.getPerfLogger();
protected static final Logger LOG = LoggerFactory.getLogger(SparkHashTableSinkOperator.class.getName());
public static final String DFS_REPLICATION_MAX = "dfs.replication.max";
private int minReplication = 10;
private final HashTableSinkOperator htsOperator;
/** Kryo ctor. */
protected SparkHashTableSinkOperator() {
super();
htsOperator = null; // Kryo will set this; or so we hope.
}
public SparkHashTableSinkOperator(CompilationOpContext ctx) {
super(ctx);
htsOperator = new HashTableSinkOperator(ctx);
}
@Override
protected void initializeOp(Configuration hconf) throws HiveException {
super.initializeOp(hconf);
ObjectInspector[] inputOIs = new ObjectInspector[conf.getTagLength()];
byte tag = conf.getTag();
inputOIs[tag] = inputObjInspectors[0];
conf.setTagOrder(new Byte[]{ tag });
int dfsMaxReplication = hconf.getInt(DFS_REPLICATION_MAX, minReplication);
// minReplication value should not cross the value of dfs.replication.max
minReplication = Math.min(minReplication, dfsMaxReplication);
htsOperator.setConf(conf);
htsOperator.initialize(hconf, inputOIs);
}
@Override
public void process(Object row, int tag) throws HiveException {
// Ignore the tag passed in, which should be 0, not what we want
htsOperator.process(row, conf.getTag());
}
@Override
public void closeOp(boolean abort) throws HiveException {
try {
MapJoinPersistableTableContainer[] mapJoinTables = htsOperator.mapJoinTables;
byte tag = conf.getTag();
if (mapJoinTables == null || mapJoinTables.length < tag
|| mapJoinTables[tag] == null) {
LOG.debug("mapJoinTable is null");
} else if (abort) {
if (LOG.isDebugEnabled()) {
LOG.debug("Aborting, skip dumping side-table for tag: " + tag);
}
} else {
String method = PerfLogger.SPARK_FLUSH_HASHTABLE + getName();
perfLogger.PerfLogBegin(CLASS_NAME, method);
try {
flushToFile(mapJoinTables[tag], tag);
} finally {
perfLogger.PerfLogEnd(CLASS_NAME, method);
}
}
super.closeOp(abort);
} catch (HiveException e) {
throw e;
} catch (Exception e) {
throw new HiveException(e);
}
}
protected void flushToFile(MapJoinPersistableTableContainer tableContainer,
byte tag) throws Exception {
MapredLocalWork localWork = getExecContext().getLocalWork();
BucketMapJoinContext mapJoinCtx = localWork.getBucketMapjoinContext();
Path inputPath = getExecContext().getCurrentInputPath();
String bigInputPath = null;
if (inputPath != null && mapJoinCtx != null) {
Set<String> aliases =
((SparkBucketMapJoinContext)mapJoinCtx).getPosToAliasMap().get((int)tag);
bigInputPath = mapJoinCtx.getMappingBigFile(
aliases.iterator().next(), inputPath.toString());
}
// get tmp file URI
Path tmpURI = localWork.getTmpHDFSPath();
LOG.info("Temp URI for side table: " + tmpURI);
// get current bucket file name
String fileName = localWork.getBucketFileName(bigInputPath);
// get the tmp URI path; it will be a hdfs path if not local mode
String dumpFilePrefix = conf.getDumpFilePrefix();
Path path = Utilities.generatePath(tmpURI, dumpFilePrefix, tag, fileName);
FileSystem fs = path.getFileSystem(htsOperator.getConfiguration());
short replication = fs.getDefaultReplication(path);
fs.mkdirs(path); // Create the folder and its parents if not there
while (true) {
path = new Path(path, getOperatorId()
+ "-" + Math.abs(Utilities.randGen.nextInt()));
try {
// This will guarantee file name uniqueness.
if (fs.createNewFile(path)) {
break;
}
} catch (FileExistsException e) {
// No problem, use a new name
}
}
// TODO find out numOfPartitions for the big table
int numOfPartitions = replication;
replication = (short) Math.max(minReplication, numOfPartitions);
htsOperator.console.printInfo(Utilities.now() + "\tDump the side-table for tag: " + tag
+ " with group count: " + tableContainer.size() + " into file: " + path);
try {
// get the hashtable file and path
OutputStream os = null;
ObjectOutputStream out = null;
MapJoinTableContainerSerDe mapJoinTableSerde = htsOperator.mapJoinTableSerdes[tag];
try {
os = fs.create(path, replication);
out = new ObjectOutputStream(new BufferedOutputStream(os, 4096));
mapJoinTableSerde.persist(out, tableContainer);
} finally {
if (out != null) {
out.close();
} else if (os != null) {
os.close();
}
}
FileStatus status = fs.getFileStatus(path);
htsOperator.console.printInfo(Utilities.now() + "\tUploaded 1 File to: " + path
+ " (" + status.getLen() + " bytes)");
} catch (Exception e) {
// Failed to dump the side-table, remove the partial file
try {
fs.delete(path, false);
} catch (Exception ex) {
LOG.warn("Got exception in deleting partial side-table dump for tag: "
+ tag + ", file " + path, ex);
}
throw e;
}
tableContainer.clear();
}
/**
* Implements the getName function for the Node Interface.
*
* @return the name of the operator
*/
@Override
public String getName() {
return SparkHashTableSinkOperator.getOperatorName();
}
public static String getOperatorName() {
return HashTableSinkOperator.getOperatorName();
}
@Override
public OperatorType getType() {
return OperatorType.HASHTABLESINK;
}
}