/**
* 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.parse.spark;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
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.Operator;
import org.apache.hadoop.hive.ql.exec.Utilities;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.optimizer.spark.SparkPartitionPruningSinkDesc;
import org.apache.hadoop.hive.ql.plan.api.OperatorType;
import org.apache.hadoop.hive.serde2.Serializer;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.io.DataOutputBuffer;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.util.ReflectionUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.annotations.VisibleForTesting;
/**
* This operator gets partition info from the upstream operators, and write them
* to HDFS. This will later be read at the driver, and used for pruning the partitions
* for the big table side.
*/
public class SparkPartitionPruningSinkOperator extends Operator<SparkPartitionPruningSinkDesc> {
@SuppressWarnings("deprecation")
protected transient Serializer serializer;
protected transient DataOutputBuffer buffer;
protected static final Logger LOG = LoggerFactory.getLogger(SparkPartitionPruningSinkOperator.class);
/** Kryo ctor. */
@VisibleForTesting
public SparkPartitionPruningSinkOperator() {
super();
}
public SparkPartitionPruningSinkOperator(CompilationOpContext ctx) {
super(ctx);
}
@Override
@SuppressWarnings("deprecation")
public void initializeOp(Configuration hconf) throws HiveException {
super.initializeOp(hconf);
serializer = (Serializer) ReflectionUtils.newInstance(
conf.getTable().getDeserializerClass(), null);
buffer = new DataOutputBuffer();
}
@Override
public void process(Object row, int tag) throws HiveException {
ObjectInspector rowInspector = inputObjInspectors[0];
try {
Writable writableRow = serializer.serialize(row, rowInspector);
writableRow.write(buffer);
} catch (Exception e) {
throw new HiveException(e);
}
}
@Override
public void closeOp(boolean abort) throws HiveException {
if (!abort) {
try {
flushToFile();
} catch (Exception e) {
throw new HiveException(e);
}
}
}
private void flushToFile() throws IOException {
// write an intermediate file to the specified path
// the format of the path is: tmpPath/targetWorkId/sourceWorkId/randInt
Path path = conf.getPath();
FileSystem fs = path.getFileSystem(this.getConfiguration());
fs.mkdirs(path);
while (true) {
path = new Path(path, String.valueOf(Utilities.randGen.nextInt()));
if (!fs.exists(path)) {
break;
}
}
short numOfRepl = fs.getDefaultReplication(path);
ObjectOutputStream out = null;
FSDataOutputStream fsout = null;
try {
fsout = fs.create(path, numOfRepl);
out = new ObjectOutputStream(new BufferedOutputStream(fsout, 4096));
out.writeUTF(conf.getTargetColumnName());
buffer.writeTo(out);
} catch (Exception e) {
try {
fs.delete(path, false);
} catch (Exception ex) {
LOG.warn("Exception happened while trying to clean partial file.");
}
throw e;
} finally {
if (out != null) {
LOG.info("Flushed to file: " + path);
out.close();
} else if (fsout != null) {
fsout.close();
}
}
}
@Override
public OperatorType getType() {
return OperatorType.SPARKPRUNINGSINK;
}
@Override
public String getName() {
return SparkPartitionPruningSinkOperator.getOperatorName();
}
public static String getOperatorName() {
return "SPARKPRUNINGSINK";
}
}