| /* |
| * 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.easy.sequencefile; |
| |
| import java.io.IOException; |
| import java.security.PrivilegedExceptionAction; |
| import java.util.concurrent.TimeUnit; |
| |
| import org.apache.drill.common.exceptions.CustomErrorContext; |
| import org.apache.drill.common.exceptions.ExecutionSetupException; |
| import org.apache.drill.common.exceptions.UserException; |
| import org.apache.drill.common.types.TypeProtos.MinorType; |
| import org.apache.drill.exec.physical.impl.scan.v3.ManagedReader; |
| import org.apache.drill.exec.physical.impl.scan.v3.file.FileDescrip; |
| import org.apache.drill.exec.physical.impl.scan.v3.file.FileSchemaNegotiator; |
| import org.apache.drill.exec.physical.resultSet.ResultSetLoader; |
| import org.apache.drill.exec.physical.resultSet.RowSetLoader; |
| import org.apache.drill.exec.record.metadata.SchemaBuilder; |
| import org.apache.drill.exec.record.metadata.TupleMetadata; |
| import org.apache.drill.exec.store.dfs.easy.EasySubScan; |
| import org.apache.drill.exec.util.ImpersonationUtil; |
| import org.apache.drill.exec.vector.accessor.ScalarWriter; |
| import com.google.common.base.Stopwatch; |
| import org.apache.hadoop.io.BytesWritable; |
| import org.apache.hadoop.mapred.InputFormat; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.hadoop.mapred.RecordReader; |
| import org.apache.hadoop.mapred.Reporter; |
| import org.apache.hadoop.mapred.SequenceFileAsBinaryInputFormat; |
| import org.apache.hadoop.security.UserGroupInformation; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class SequenceFileBatchReader implements ManagedReader { |
| |
| private static final Logger logger = LoggerFactory.getLogger(SequenceFileBatchReader.class); |
| |
| private final FileDescrip file; |
| private final String opUserName; |
| private final String queryUserName; |
| public static final String KEY_SCHEMA = "binary_key"; |
| public static final String VALUE_SCHEMA = "binary_value"; |
| private final BytesWritable key = new BytesWritable(); |
| private final BytesWritable value = new BytesWritable(); |
| private final RowSetLoader loader; |
| private final ScalarWriter keyWriter; |
| private final ScalarWriter valueWriter; |
| private RecordReader<BytesWritable, BytesWritable> reader; |
| private final CustomErrorContext errorContext; |
| private final Stopwatch watch; |
| |
| public SequenceFileBatchReader(SequenceFileFormatConfig config, EasySubScan scan, FileSchemaNegotiator negotiator) { |
| errorContext = negotiator.parentErrorContext(); |
| file = negotiator.file(); |
| opUserName = scan.getUserName(); |
| queryUserName = negotiator.context().getFragmentContext().getQueryUserName(); |
| |
| negotiator.tableSchema(defineMetadata(), true); |
| logger.trace("The config is {}, root is {}, columns has {}", config, scan.getSelectionRoot(), scan.getColumns()); |
| try { |
| processReader(negotiator); |
| } catch (ExecutionSetupException e) { |
| throw UserException |
| .dataReadError(e) |
| .message("Failure in initial sequencefile reader") |
| .addContext(e.getMessage()) |
| .addContext(errorContext) |
| .build(logger); |
| } |
| ResultSetLoader setLoader = negotiator.build(); |
| loader = setLoader.writer(); |
| keyWriter = loader.scalar(KEY_SCHEMA); |
| valueWriter = loader.scalar(VALUE_SCHEMA); |
| watch = Stopwatch.createStarted(); |
| } |
| |
| private TupleMetadata defineMetadata() { |
| SchemaBuilder builder = new SchemaBuilder(); |
| builder.addNullable(KEY_SCHEMA, MinorType.VARBINARY); |
| builder.addNullable(VALUE_SCHEMA, MinorType.VARBINARY); |
| return builder.buildSchema(); |
| } |
| |
| private void processReader(FileSchemaNegotiator negotiator) throws ExecutionSetupException { |
| final SequenceFileAsBinaryInputFormat inputFormat = new SequenceFileAsBinaryInputFormat(); |
| final JobConf jobConf = new JobConf(file.fileSystem().getConf()); |
| jobConf.setInputFormat(inputFormat.getClass()); |
| reader = getRecordReader(inputFormat, jobConf); |
| } |
| |
| private RecordReader<BytesWritable, BytesWritable> getRecordReader( |
| final InputFormat<BytesWritable, BytesWritable> inputFormat, final JobConf jobConf) |
| throws ExecutionSetupException { |
| try { |
| final UserGroupInformation ugi = ImpersonationUtil.createProxyUgi(opUserName, queryUserName); |
| return ugi.doAs(new PrivilegedExceptionAction<RecordReader<BytesWritable, BytesWritable>>() { |
| @Override |
| public RecordReader<BytesWritable, BytesWritable> run() throws Exception { |
| return inputFormat.getRecordReader(file.split(), jobConf, Reporter.NULL); |
| } |
| }); |
| } catch (IOException | InterruptedException e) { |
| throw UserException |
| .dataReadError(e) |
| .message("Error in creating sequencefile reader for file: %s, start: %d, length: %d", |
| file.split().getPath(), file.split().getStart(), file.split().getLength()) |
| .addContext(e.getMessage()) |
| .addContext(errorContext) |
| .build(logger); |
| } |
| } |
| |
| @Override |
| public boolean next() { |
| try { |
| while (!loader.isFull()) { |
| if (reader.next(key, value)) { |
| loader.start(); |
| keyWriter.setBytes(key.getBytes(), key.getLength()); |
| valueWriter.setBytes(value.getBytes(), value.getLength()); |
| loader.save(); |
| } else { |
| logger.debug("Reader fetch {} records in {} ms", loader.rowCount(), watch.elapsed(TimeUnit.MILLISECONDS)); |
| watch.stop(); |
| return false; |
| } |
| } |
| return true; |
| } catch (IOException e) { |
| throw UserException |
| .dataReadError(e) |
| .message("An error occurred while reading the next key/value pair") |
| .addContext(e.getMessage()) |
| .addContext(errorContext) |
| .build(logger); |
| } |
| } |
| |
| @Override |
| public void close() { |
| try { |
| // Hadoop 2 compat: {@link org.apache.hadoop.mapred.RecordReader} does not |
| // support AutoCloseable and must be closed manually. |
| if (reader != null) { |
| reader.close(); |
| reader = null; |
| } |
| } catch (IOException e) { |
| throw UserException |
| .dataReadError(e) |
| .message("Error closing sequencefile reader: " + e.getMessage()) |
| .addContext(errorContext) |
| .build(logger); |
| } |
| } |
| } |