Github user Ben-Zvi commented on a diff in the pull request:
https://github.com/apache/drill/pull/761#discussion_r103068736
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/xsort/managed/ExternalSortBatch.java
---
@@ -948,50 +1027,50 @@ private void updateMemoryEstimates(long memoryDelta,
RecordBatchSizer sizer) {
// spill batches of either 64K records, or as many records as fit into
the
// amount of memory dedicated to each spill batch, whichever is less.
- spillBatchRowCount = (int) Math.max(1, spillBatchSize /
estimatedRowWidth);
+ spillBatchRowCount = (int) Math.max(1, preferredSpillBatchSize /
estimatedRowWidth / 2);
--- End diff --
This factor of 2 seems extremely cautious; we may pay a little in
performance every time, just for that.
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