leventov opened a new issue #6826: Concurrency bug in DruidSchema.refreshSegmentsForDataSource() URL: https://github.com/apache/incubator-druid/issues/6826 segmentMap is created outside of lock, so by the time of `SegmentMetadataHolder holder = dataSourceSegments.get(segment);` segment could be already removed. It could cause NPE below. FYI @surekhasaharan @gianm
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