| /* |
| * 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.sysds.runtime.instructions.spark.utils; |
| |
| import org.apache.spark.api.java.JavaPairRDD; |
| import org.apache.spark.api.java.function.Function; |
| import org.apache.spark.api.java.function.Function2; |
| import org.apache.sysds.runtime.DMLRuntimeException; |
| import org.apache.sysds.runtime.matrix.data.FrameBlock; |
| |
| |
| public class FrameRDDAggregateUtils |
| { |
| |
| public static JavaPairRDD<Long, FrameBlock> mergeByKey( JavaPairRDD<Long, FrameBlock> in ) |
| { |
| //use combine by key to avoid unnecessary deep block copies, i.e. |
| //create combiner block once and merge remaining blocks in-place. |
| return in.combineByKey( |
| new CreateBlockCombinerFunction(), |
| new MergeBlocksFunction(false), |
| new MergeBlocksFunction(false) ); |
| } |
| |
| private static class CreateBlockCombinerFunction implements Function<FrameBlock, FrameBlock> |
| { |
| private static final long serialVersionUID = -4445167244905540494L; |
| |
| @Override |
| public FrameBlock call(FrameBlock arg0) |
| throws Exception |
| { |
| //create deep copy of given block |
| return new FrameBlock(arg0); |
| } |
| } |
| |
| private static class MergeBlocksFunction implements Function2<FrameBlock, FrameBlock, FrameBlock> |
| { |
| private static final long serialVersionUID = 7807210434431147007L; |
| |
| private boolean _deep = false; |
| |
| public MergeBlocksFunction(boolean deep) { |
| _deep = deep; |
| } |
| |
| @Override |
| public FrameBlock call(FrameBlock b1, FrameBlock b2) |
| throws Exception |
| { |
| // sanity check input dimensions |
| if (b1.getNumRows() != b2.getNumRows() || b1.getNumColumns() != b2.getNumColumns()) { |
| throw new DMLRuntimeException("Mismatched frame block sizes for: " |
| + b1.getNumRows() + " " + b1.getNumColumns() + " " |
| + b2.getNumRows() + " " + b2.getNumColumns()); |
| } |
| |
| // execute merge (never pass by reference) |
| FrameBlock ret = _deep ? new FrameBlock(b1) : b1; |
| ret.merge(b2); |
| return ret; |
| } |
| } |
| } |