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HLLSketchMerge aggregator failing for some metrics after upgrade to v0.18 #9736

@scrawfor

Description

@scrawfor

Please provide a detailed title (e.g. "Broker crashes when using TopN query with Bound filter" instead of just "Broker crashes").

Affected Version

v0.18 (upgraded from 0.16.0)

Description

The HLLSketchMerge aggregator is failing for some of our metrics after upgrading to druid 0.18.0. Reverting back to 0.16.0 fixes the issue. I have isolated specific segments where the issue occurs, moved those segments back to our 0.16 historical and have been successfully able to query the same metric.

Re-indexing data does not seem to fix the issue.

Error Message.

{
  "error": "Unknown exception",
  "errorMessage": "java.util.concurrent.ExecutionException: java.lang.RuntimeException: org.apache.datasketches.SketchesArgumentException: Incomming sketch is corrupted, Rebuild_CurMin_Num_KxQ flag is set.",
  "errorClass": "java.lang.RuntimeException",
  "host": null
}

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