HeartSaVioR commented on issue #23850: [SPARK-26949][SS] Prevent 'purge' to remove needed batch files in CompactibleFileStreamLog URL: https://github.com/apache/spark/pull/23850#issuecomment-466176645 Btw, `purgeAfter` would be safe since it'll leave compaction batch which batch id is equals or less than thresholdBatchId, or otherwise remaining batches don't need compaction batch (batches before first compaction).
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