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The following commit(s) were added to refs/heads/master by this push:
new 09e5e93e3e8 perf: Double default loadahead for MSQ. (#19414)
09e5e93e3e8 is described below
commit 09e5e93e3e8986d42020250178b7f50bc9063907
Author: Gian Merlino <[email protected]>
AuthorDate: Tue May 5 20:21:17 2026 -0700
perf: Double default loadahead for MSQ. (#19414)
Setting loadahead to double the number of processing threads provides a
better likelihood of keeping the processing threads busy. It also
matches the default number of VSF on-demand loading threads.
---
.../main/java/org/apache/druid/msq/querykit/BaseLeafStageProcessor.java | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git
a/multi-stage-query/src/main/java/org/apache/druid/msq/querykit/BaseLeafStageProcessor.java
b/multi-stage-query/src/main/java/org/apache/druid/msq/querykit/BaseLeafStageProcessor.java
index 1748b528113..240e0b9e75f 100644
---
a/multi-stage-query/src/main/java/org/apache/druid/msq/querykit/BaseLeafStageProcessor.java
+++
b/multi-stage-query/src/main/java/org/apache/druid/msq/querykit/BaseLeafStageProcessor.java
@@ -292,7 +292,7 @@ public abstract class BaseLeafStageProcessor extends
BasicStageProcessor
return new ReadableInputQueue(
new StandardPartitionReader(context),
filteredSlices,
- segmentLoadAheadCount != null ? segmentLoadAheadCount :
context.threadCount()
+ segmentLoadAheadCount != null ? segmentLoadAheadCount :
context.threadCount() * 2
);
}
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