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From fhueske <...@git.apache.org>
Subject [GitHub] flink pull request: FLINK-3179 Combiner is not injected if Reduce ...
Date Wed, 17 Feb 2016 11:42:11 GMT
Github user fhueske commented on a diff in the pull request:

    https://github.com/apache/flink/pull/1553#discussion_r53152668
  
    --- Diff: flink-optimizer/src/main/java/org/apache/flink/optimizer/operators/GroupReduceWithCombineProperties.java
---
    @@ -87,19 +92,39 @@ public DriverStrategy getStrategy() {
     		return DriverStrategy.SORTED_GROUP_REDUCE;
     	}
     
    -	@Override
     	public SingleInputPlanNode instantiate(Channel in, SingleInputNode node) {
     		if (in.getShipStrategy() == ShipStrategyType.FORWARD) {
     			// adjust a sort (changes grouping, so it must be for this driver to combining sort
    -			if (in.getLocalStrategy() == LocalStrategy.SORT) {
    -				if (!in.getLocalStrategyKeys().isValidUnorderedPrefix(this.keys)) {
    -					throw new RuntimeException("Bug: Inconsistent sort for group strategy.");
    +			if(in.getSource().getOptimizerNode() instanceof PartitionNode) {
    +				// Inject a combiner before the partition node
    +				Channel toCombiner = new Channel(in.getSource());
    +				toCombiner.setShipStrategy(ShipStrategyType.FORWARD, DataExchangeMode.PIPELINED);
    +				GroupReduceNode combinerNode = ((GroupReduceNode) node).getCombinerUtilityNode();
    +				combinerNode.setParallelism(in.getSource().getParallelism());
    +				if(toCombiner.getSource().getInputs().iterator().hasNext()) {
    +					Channel source = toCombiner.getSource().getInputs().iterator().next();
    +					// A combiner plan node is created with the map as the input
    +					SingleInputPlanNode combiner = new SingleInputPlanNode(combinerNode, "Combine("+node.getOperator()
    --- End diff --
    
    We should use a new channel here instead of the existing `source` channel. In the other
branch, the new channel is called `toCombiner`.


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