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Sample per-block resource usage in ProjectionOperator for OOM accounting #18620

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Sample per-block resource usage in ProjectionOperator for OOM accounting #18620

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4c6ea4e
Add OOM sampling and termination checks to leaf group-by aggregation
yashmayya May 28, 2026
b165b89
Move per-block OOM sampling to the shared ProjectionOperator path
yashmayya May 28, 2026
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5 changes: 5 additions & 0 deletions pinot-core/src/main/java/org/apache/pinot/core/operator/ProjectionOperator.java
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Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,7 @@
import org.apache.pinot.core.operator.blocks.ProjectionBlock;
import org.apache.pinot.core.query.request.context.QueryContext;
import org.apache.pinot.segment.spi.datasource.DataSource;
import org.apache.pinot.spi.query.QueryThreadContext;
import org.apache.pinot.spi.trace.Tracing;


Expand Down Expand Up @@ -91,6 +92,10 @@ protected ProjectionBlock getNextBlock() {
} else {
Tracing.activeRecording().setNumChildren(_dataSourceMap.size());
_dataBlockCache.initNewBlock(docIdSetBlock.getDocIds(), docIdSetBlock.getLength());
// Sample resource usage once per projected block so OOM accounting stays fresh across long scans. This is the
// shared projection path for scan-based operators (aggregation, group-by, distinct, selection). Termination is
// already checked per block by BaseOperator#nextBlock.
QueryThreadContext.sampleUsage();
return new ProjectionBlock(_dataSourceMap, _dataBlockCache);
}
}
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