gianm commented on code in PR #13274:
URL: https://github.com/apache/druid/pull/13274#discussion_r1013008436
##########
extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/exec/WorkerMemoryParameters.java:
##########
@@ -282,13 +283,19 @@ private static long memoryPerBundle(
)
{
final int bundleCount = numWorkersInJvm + numProcessingThreadsInJvm;
- return (long) (maxMemoryInJvm * USABLE_MEMORY_FRACTION) / bundleCount;
+
+ // Need to subtract memoryForStatisticsTracking off the top, since this is
reserved for statistics collection.
+ final long memoryForStatisticsTracking = (long) numWorkersInJvm *
StageDefinition.PARTITION_STATS_MAX_BYTES;
+ final long memoryForBundles = (long) (maxMemoryInJvm *
USABLE_MEMORY_FRACTION - memoryForStatisticsTracking);
Review Comment:
There's a reasonable error that occurs later on; see
WorkerMemoryParametersTest.
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