itschrispeck commented on code in PR #15234:
URL: https://github.com/apache/pinot/pull/15234#discussion_r1999346853
##########
pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/realtime/PinotLLCRealtimeSegmentManager.java:
##########
@@ -1093,6 +1093,35 @@ public void segmentStoppedConsuming(LLCSegmentName
llcSegmentName, String instan
}
}
+ /**
+ * An instance is reporting that it cannot build segment due to
non-recoverable error, usually due to size too large.
+ * Reduce the segment "segment.flush.threshold.size" to its half value.
+ */
+ public void reduceSegmentSizeAndReset(LLCSegmentName llcSegmentName, int
prevNumRows) {
+ Preconditions.checkState(!_isStopping, "Segment manager is stopping");
+ // reduce the segment size to its half
+ String segmentName = llcSegmentName.getSegmentName();
+ String realtimeTableName =
TableNameBuilder.REALTIME.tableNameWithType(llcSegmentName.getTableName());
+
+ Stat stat = new Stat();
+ SegmentZKMetadata prevSegmentZKMetadata =
getSegmentZKMetadata(realtimeTableName, segmentName, stat);
+ Preconditions.checkState(prevSegmentZKMetadata.getStatus() ==
Status.IN_PROGRESS,
+ "Segment status for segment: %s should be IN_PROGRESS, found: %s",
segmentName,
+ prevSegmentZKMetadata.getStatus());
+
+ int prevTargetNumRows =
prevSegmentZKMetadata.getSizeThresholdToFlushSegment();
+ int newNumRows = Math.min(prevNumRows / 2, prevTargetNumRows / 2);
Review Comment:
Is `prevNumRows` strictly smaller than `prevTargetNumRows`?
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