jihoonson opened a new pull request #7203: Fix race in historical when loading segments in parallel URL: https://github.com/apache/incubator-druid/pull/7203 Partially addresses https://github.com/apache/incubator-druid/issues/7192. In this PR, - `segmentManager` is supposed to be thread-safe, but `segmentLoader` in it is not. Now, it's synchronized when it's accessed. - In `BatchDataSegmentAnnouncer.announceSegment()`, `if (segmentLookup.containsKey(segment))` is checked again inside of the lock. - In `HttpLoadQueuePeon`, `batchSize` counts only unexpired requests. - Added tests for `BatchDataSegmentAnnouncer` and `SegmentManager`.
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