KAFKA-20036 Handle LogCleaner segment overflow caused by compression level changes #21379
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Jan 31, 2026
| try { | ||
| // it's OK not to hold the Log's lock in this case, because this segment is only accessed by other threads | ||
| // after `Log.replaceSegments` (which acquires the lock) is called | ||
| dest.append(result.maxOffset(), retained); |
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Could you wrap only dest.append in the try-catch block to avoid catching unrelated error?
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| public SegmentOverflowException(LogSegment segment) { | ||
| super("Segment size would overflow during compaction for segment " + segment); | ||
| this.segment = segment; |
| log.name(), new Date(cleanableHorizonMs), new Date(legacyDeleteHorizonMs)); | ||
| CleanedTransactionMetadata transactionMetadata = new CleanedTransactionMetadata(); | ||
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| double sizeRatio = 1.0; |
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Would something like this work better?
double sizeRatio = segmentOverflowPartitions.getOrDefault(log.topicPartition(), 1.0);
if (sizeRatio != 1.0) {
logger.info("Partition {} has overflow history. " + "Reducing effective segment size to {}% for this round.",
log.topicPartition(), sizeRatio * 100);
}| cleanSegments(log, group, offsetMap, currentTime, stats, transactionMetadata, legacyDeleteHorizonMs, upperBoundOffset); | ||
| } | ||
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| if (segmentOverflowPartitions.containsKey(log.topicPartition())) { |
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if (segmentOverflowPartitions.remove(log.topicPartition()) != null) {
logger.info("Successfully cleaned log {} with degraded size (ratio: {}%). " +
"Cleared overflow marker. Next cleaning will use normal size.",
log.name(), sizeRatio * 100);
}| currentTime | ||
| ); | ||
| } catch (SegmentOverflowException e) { | ||
| if (segmentOverflowPartitions.containsKey(log.topicPartition())) { |
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var previousRatio = segmentOverflowPartitions.put(log.topicPartition(),
segmentOverflowPartitions.getOrDefault(log.topicPartition(), 1.0) * 0.9);
if (previousRatio == null) {
logger.warn("Segment overflow detected for partition {}: {}. " +
"Marked for degradation to 90% size in next cleaning round.",
log.topicPartition(), e.getMessage());
} else {
logger.warn("Repeated segment overflow for partition {}: {}. " +
"Further degrading to {}% size in next cleaning round.",
log.topicPartition(), e.getMessage(), previousRatio * 0.9 * 100);
}
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We add a new map to record which topic partitions have experienced
overflow. When an overflow occurs, the next time the group is
processed, we reduce the segment size by a factor of 0.9 to prevent the
overflow from happening again. If the partition still overflows, we
continue to multiply the ratio by 0.9 on subsequent attempts until the
partition is successfully cleaned.