amansinha100 commented on a change in pull request #1466: DRILL-6381: Add
support for index based planning and execution
URL: https://github.com/apache/drill/pull/1466#discussion_r228358390
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File path:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/BroadcastExchangePrel.java
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@@ -57,7 +57,9 @@ public RelOptCost computeSelfCost(RelOptPlanner planner,
RelMetadataQuery mq) {
final int rowWidth = child.getRowType().getFieldCount() *
DrillCostBase.AVG_FIELD_WIDTH;
final double cpuCost = broadcastFactor * DrillCostBase.SVR_CPU_COST *
inputRows;
- final double networkCost = broadcastFactor *
DrillCostBase.BYTE_NETWORK_COST * inputRows * rowWidth * numEndPoints;
+
+ //we assume localhost network cost is 1/10 of regular network cost
+ final double networkCost = broadcastFactor *
DrillCostBase.BYTE_NETWORK_COST * inputRows * rowWidth * (numEndPoints - 0.9);
Review comment:
I have added comments in the code regarding this.
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