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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.drill.exec.store.hive;
import org.apache.drill.shaded.guava.com.google.common.base.Preconditions;
import org.apache.drill.common.exceptions.ExecutionSetupException;
import org.apache.drill.exec.ops.ExecutorFragmentContext;
import org.apache.drill.exec.ops.OperatorContext;
import org.apache.drill.exec.physical.impl.BatchCreator;
import org.apache.drill.exec.record.CloseableRecordBatch;
import org.apache.drill.exec.record.RecordBatch;
import org.apache.drill.exec.server.options.OptionManager;
import org.apache.drill.exec.store.dfs.DrillFileSystem;
import org.apache.drill.exec.store.parquet.AbstractParquetScanBatchCreator;
import org.apache.hadoop.conf.Configuration;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class HiveDrillNativeParquetScanBatchCreator extends AbstractParquetScanBatchCreator implements BatchCreator<HiveDrillNativeParquetRowGroupScan> {
@Override
public CloseableRecordBatch getBatch(ExecutorFragmentContext context, HiveDrillNativeParquetRowGroupScan rowGroupScan, List<RecordBatch> children) throws ExecutionSetupException {
Preconditions.checkArgument(children.isEmpty());
OperatorContext oContext = context.newOperatorContext(rowGroupScan);
return getBatch(context, rowGroupScan, oContext);
}
@Override
protected AbstractDrillFileSystemManager getDrillFileSystemCreator(OperatorContext operatorContext, OptionManager optionManager) {
return new HiveDrillNativeParquetDrillFileSystemManager(operatorContext);
}
/**
* Caches file system per path and returns file system from cache if it exists there.
* Creates only non-tracking file systems.
*/
private class HiveDrillNativeParquetDrillFileSystemManager extends AbstractDrillFileSystemManager {
private final Map<String, DrillFileSystem> fileSystems;
HiveDrillNativeParquetDrillFileSystemManager(OperatorContext operatorContext) {
super(operatorContext);
this.fileSystems = new HashMap<>();
}
@Override
protected DrillFileSystem get(Configuration config, String path) throws ExecutionSetupException {
DrillFileSystem fs = fileSystems.get(path);
if (fs == null) {
try {
fs = operatorContext.newNonTrackingFileSystem(config);
} catch (IOException e) {
throw new ExecutionSetupException(String.format("Failed to create non-tracking DrillFileSystem: %s", e.getMessage()), e);
}
fileSystems.put(path, fs);
}
return fs;
}
}
}
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