/*
* Licensed 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 com.facebook.presto.hive;
import com.facebook.presto.spi.ConnectorSession;
import com.facebook.presto.spi.PrestoException;
import com.facebook.presto.spi.RecordCursor;
import com.facebook.presto.spi.predicate.TupleDomain;
import com.facebook.presto.spi.type.TypeManager;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.mapred.RecordReader;
import org.joda.time.DateTimeZone;
import javax.inject.Inject;
import java.io.IOException;
import java.util.List;
import java.util.Optional;
import java.util.Properties;
import static com.facebook.presto.hive.HiveErrorCode.HIVE_FILESYSTEM_ERROR;
import static java.util.Objects.requireNonNull;
public class GenericHiveRecordCursorProvider
implements HiveRecordCursorProvider
{
private final HdfsEnvironment hdfsEnvironment;
@Inject
public GenericHiveRecordCursorProvider(HdfsEnvironment hdfsEnvironment)
{
this.hdfsEnvironment = requireNonNull(hdfsEnvironment, "hdfsEnvironment is null");
}
@Override
public Optional<RecordCursor> createRecordCursor(
String clientId,
Configuration configuration,
ConnectorSession session,
Path path,
long start,
long length,
Properties schema,
List<HiveColumnHandle> columns,
TupleDomain<HiveColumnHandle> effectivePredicate,
DateTimeZone hiveStorageTimeZone,
TypeManager typeManager)
{
// make sure the FileSystem is created with the proper Configuration object
try {
this.hdfsEnvironment.getFileSystem(session.getUser(), path);
}
catch (IOException e) {
throw new PrestoException(HIVE_FILESYSTEM_ERROR, "Failed getting FileSystem: " + path, e);
}
RecordReader<?, ?> recordReader = hdfsEnvironment.doAs(session.getUser(),
() -> HiveUtil.createRecordReader(configuration, path, start, length, schema, columns));
return Optional.of(new GenericHiveRecordCursor<>(
genericRecordReader(recordReader),
length,
schema,
columns,
hiveStorageTimeZone,
typeManager));
}
@SuppressWarnings("unchecked")
private static RecordReader<?, ? extends Writable> genericRecordReader(RecordReader<?, ?> recordReader)
{
return (RecordReader<?, ? extends Writable>) recordReader;
}
}