| /* |
| * Copyright 2009-2012 by The Regents of the University of California |
| * 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 from |
| * |
| * 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 edu.uci.ics.hyracks.hdfs.dataflow; |
| |
| import java.util.Arrays; |
| |
| import org.apache.hadoop.mapred.InputFormat; |
| import org.apache.hadoop.mapred.InputSplit; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.hadoop.mapred.RecordReader; |
| import org.apache.hadoop.mapred.Reporter; |
| |
| import edu.uci.ics.hyracks.api.context.IHyracksTaskContext; |
| import edu.uci.ics.hyracks.api.dataflow.IOperatorNodePushable; |
| import edu.uci.ics.hyracks.api.dataflow.value.IRecordDescriptorProvider; |
| import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor; |
| import edu.uci.ics.hyracks.api.exceptions.HyracksDataException; |
| import edu.uci.ics.hyracks.api.exceptions.HyracksException; |
| import edu.uci.ics.hyracks.api.job.JobSpecification; |
| import edu.uci.ics.hyracks.dataflow.std.base.AbstractSingleActivityOperatorDescriptor; |
| import edu.uci.ics.hyracks.dataflow.std.base.AbstractUnaryOutputSourceOperatorNodePushable; |
| import edu.uci.ics.hyracks.hdfs.api.IKeyValueParser; |
| import edu.uci.ics.hyracks.hdfs.api.IKeyValueParserFactory; |
| |
| /** |
| * The HDFS file read operator using the Hadoop old API. |
| * To use this operator, a user need to provide an IKeyValueParserFactory implementation which convert |
| * key-value pairs into tuples. |
| */ |
| @SuppressWarnings({ "deprecation", "rawtypes" }) |
| public class HDFSReadOperatorDescriptor extends AbstractSingleActivityOperatorDescriptor { |
| |
| private static final long serialVersionUID = 1L; |
| private final ConfFactory confFactory; |
| private final InputSplitsFactory splitsFactory; |
| private final String[] scheduledLocations; |
| private final IKeyValueParserFactory tupleParserFactory; |
| private final boolean[] executed; |
| |
| /** |
| * The constructor of HDFSReadOperatorDescriptor. |
| * |
| * @param spec |
| * the JobSpecification object |
| * @param rd |
| * the output record descriptor |
| * @param conf |
| * the Hadoop JobConf object, which contains the input format and the input paths |
| * @param splits |
| * the array of FileSplits (HDFS chunks). |
| * @param scheduledLocations |
| * the node controller names to scan the FileSplits, which is an one-to-one mapping. The String array |
| * is obtained from the edu.cui.ics.hyracks.hdfs.scheduler.Scheduler.getLocationConstraints(InputSplits[]). |
| * @param tupleParserFactory |
| * the ITupleParserFactory implementation instance. |
| * @throws HyracksException |
| */ |
| public HDFSReadOperatorDescriptor(JobSpecification spec, RecordDescriptor rd, JobConf conf, InputSplit[] splits, |
| String[] scheduledLocations, IKeyValueParserFactory tupleParserFactory) throws HyracksException { |
| super(spec, 0, 1); |
| try { |
| this.splitsFactory = new InputSplitsFactory(splits); |
| this.confFactory = new ConfFactory(conf); |
| } catch (Exception e) { |
| throw new HyracksException(e); |
| } |
| this.scheduledLocations = scheduledLocations; |
| this.executed = new boolean[scheduledLocations.length]; |
| Arrays.fill(executed, false); |
| this.tupleParserFactory = tupleParserFactory; |
| this.recordDescriptors[0] = rd; |
| } |
| |
| @Override |
| public IOperatorNodePushable createPushRuntime(final IHyracksTaskContext ctx, |
| IRecordDescriptorProvider recordDescProvider, final int partition, final int nPartitions) |
| throws HyracksDataException { |
| final InputSplit[] inputSplits = splitsFactory.getSplits(); |
| |
| return new AbstractUnaryOutputSourceOperatorNodePushable() { |
| private String nodeName = ctx.getJobletContext().getApplicationContext().getNodeId(); |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public void initialize() throws HyracksDataException { |
| ClassLoader ctxCL = Thread.currentThread().getContextClassLoader(); |
| try { |
| Thread.currentThread().setContextClassLoader(getClass().getClassLoader()); |
| JobConf conf = confFactory.getConf(); |
| IKeyValueParser parser = tupleParserFactory.createKeyValueParser(ctx); |
| writer.open(); |
| InputFormat inputFormat = conf.getInputFormat(); |
| for (int i = 0; i < inputSplits.length; i++) { |
| /** |
| * read all the partitions scheduled to the current node |
| */ |
| if (scheduledLocations[i].equals(nodeName)) { |
| /** |
| * pick an unread split to read |
| * synchronize among simultaneous partitions in the same machine |
| */ |
| synchronized (executed) { |
| if (executed[i] == false) { |
| executed[i] = true; |
| } else { |
| continue; |
| } |
| } |
| |
| /** |
| * read the split |
| */ |
| RecordReader reader = inputFormat.getRecordReader(inputSplits[i], conf, Reporter.NULL); |
| Object key = reader.createKey(); |
| Object value = reader.createValue(); |
| while (reader.next(key, value) == true) { |
| parser.parse(key, value, writer); |
| } |
| } |
| } |
| parser.flush(writer); |
| writer.close(); |
| } catch (Exception e) { |
| throw new HyracksDataException(e); |
| } finally { |
| Thread.currentThread().setContextClassLoader(ctxCL); |
| } |
| } |
| }; |
| } |
| } |