leventov opened a new issue #8492: Improper Appenderator.add() calls concurrent with persist URL: https://github.com/apache/incubator-druid/issues/8492 This issue is to track NPE reported in https://github.com/RoaringBitmap/RoaringBitmap/issues/358 but it doesn't seem that it may be caused by a bug in RoaringBitmap. Hence I think it's caused by a bug in Druid. @jihoonson > the read operation (persist operation in Druid) happens only when all write operations (indexing operation in Druid) are finished. Could you demonstrate which synchronization mechanism or a happens-before edge or a casualty edge specifically ensure this? I cannot find it. It seems to happen somewhere in `SeekableStreamIndexTaskRunner.runInternal()` (related: https://github.com/apache/incubator-druid/issues/7360).
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