| /* |
| * 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.hudi.hadoop; |
| |
| import org.apache.hadoop.io.ArrayWritable; |
| import org.apache.hadoop.io.NullWritable; |
| import org.apache.hadoop.io.Writable; |
| import org.apache.hadoop.mapred.RecordReader; |
| |
| import java.io.IOException; |
| import java.util.stream.Collectors; |
| import java.util.stream.IntStream; |
| import org.apache.hudi.common.util.ValidationUtils; |
| import org.apache.log4j.LogManager; |
| import org.apache.log4j.Logger; |
| |
| /** |
| * Stitches 2 record reader returned rows and presents a concatenated view to clients. |
| */ |
| public class BootstrapColumnStichingRecordReader implements RecordReader<NullWritable, ArrayWritable> { |
| |
| private static final Logger LOG = LogManager.getLogger(BootstrapColumnStichingRecordReader.class); |
| |
| private final RecordReader<NullWritable, ArrayWritable> leftColsRecordReader; |
| private final RecordReader<NullWritable, ArrayWritable> rightColsRecordReader; |
| private final int numLeftColumns; |
| private final ArrayWritable values; |
| private final boolean validate; |
| |
| public BootstrapColumnStichingRecordReader(RecordReader<NullWritable, ArrayWritable> left, |
| int numLeftColumns, RecordReader<NullWritable, ArrayWritable> right, int numRightColumns, boolean validate) { |
| this.leftColsRecordReader = left; |
| this.rightColsRecordReader = right; |
| this.validate = validate; |
| this.numLeftColumns = numLeftColumns; |
| |
| ArrayWritable rightW = rightColsRecordReader.createValue(); |
| int numColumns = numLeftColumns + numRightColumns; |
| if (rightW.getValueClass() != null) { |
| values = new ArrayWritable(rightW.getValueClass(), new Writable[numColumns]); |
| } else { |
| String[] vals = IntStream.range(0, numColumns).mapToObj(idx -> "").collect(Collectors.toList()) |
| .toArray(new String[0]); |
| values = new ArrayWritable(vals); |
| } |
| LOG.info("Total ArrayWritable Length :" + values.get().length); |
| } |
| |
| @Override |
| public boolean next(NullWritable key, ArrayWritable value) throws IOException { |
| ArrayWritable left = leftColsRecordReader.createValue(); |
| ArrayWritable right = rightColsRecordReader.createValue(); |
| |
| boolean hasMoreOnLeft = leftColsRecordReader.next(leftColsRecordReader.createKey(), left); |
| boolean hasMoreOnRight = rightColsRecordReader.next(rightColsRecordReader.createKey(), right); |
| if (validate) { |
| ValidationUtils.checkArgument(hasMoreOnLeft == hasMoreOnRight, |
| String.format("hasMoreOnLeft:%s, hasMoreOnRight: %s", hasMoreOnLeft, hasMoreOnRight)); |
| } |
| for (int i = 0; i < numLeftColumns; i++) { |
| value.get()[i] = left.get()[i]; |
| } |
| for (int j = numLeftColumns; j < right.get().length; j++) { |
| value.get()[j] = right.get()[j]; |
| } |
| return hasMoreOnLeft && hasMoreOnRight; |
| } |
| |
| @Override |
| public NullWritable createKey() { |
| return leftColsRecordReader.createKey(); |
| } |
| |
| @Override |
| public ArrayWritable createValue() { |
| return values; |
| } |
| |
| @Override |
| public long getPos() throws IOException { |
| return leftColsRecordReader.getPos(); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| leftColsRecordReader.close(); |
| rightColsRecordReader.close(); |
| } |
| |
| @Override |
| public float getProgress() throws IOException { |
| return leftColsRecordReader.getProgress(); |
| } |
| } |