001/* 002 * Copyright (c) 2016-2017 Chris K Wensel <chris@wensel.net>. All Rights Reserved. 003 * Copyright (c) 2007-2017 Xplenty, Inc. All Rights Reserved. 004 * 005 * Project and contact information: http://www.cascading.org/ 006 * 007 * This file is part of the Cascading project. 008 * 009 * Licensed under the Apache License, Version 2.0 (the "License"); 010 * you may not use this file except in compliance with the License. 011 * You may obtain a copy of the License at 012 * 013 * http://www.apache.org/licenses/LICENSE-2.0 014 * 015 * Unless required by applicable law or agreed to in writing, software 016 * distributed under the License is distributed on an "AS IS" BASIS, 017 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 018 * See the License for the specific language governing permissions and 019 * limitations under the License. 020 */ 021 022package cascading.flow.tez.planner.rule.transformer; 023 024import cascading.flow.planner.iso.expression.ElementCapture; 025import cascading.flow.planner.rule.transformer.BoundaryElementFactory; 026import cascading.flow.planner.rule.transformer.RuleInsertionTransformer; 027import cascading.flow.tez.planner.rule.expression.BalanceSplitToStreamedHashJoinExpression; 028 029import static cascading.flow.planner.rule.PlanPhase.BalanceAssembly; 030 031/** 032 * Inserts Boundary after split that joins back into a HashJoin. 033 * <p> 034 * this allows testGroupBySplitGroupByJoin to pass, and simplifies testJoinSamePipeAroundGroupBy by preventing 035 * the upstream operations to duplicate processing in parallel nodes 036 */ 037public class BoundaryBalanceSplitToStreamedHashJoinTransformer extends RuleInsertionTransformer 038 { 039 public BoundaryBalanceSplitToStreamedHashJoinTransformer() 040 { 041 super( 042 BalanceAssembly, 043 new BalanceSplitToStreamedHashJoinExpression(), 044 ElementCapture.Secondary, 045 BoundaryElementFactory.BOUNDARY_PIPE 046 ); 047 } 048 }