[GitHub] [druid] jihoonson commented on issue #11544: "java.lang.NullPointerException" occurs when using APPROX_QUANTILE_DS

[GitBox <gi...@apache.org>]

jihoonson commented on issue #11544:
URL: https://github.com/apache/druid/issues/11544#issuecomment-893155588


   Hi @lsee9, thank you for the report. I would call this a bug of Druid because Druid should have returned a better error than NPE. To answer your questions, I think your assessment is correct about the lack of memory. Please see https://datasketches.apache.org/docs/Quantiles/OrigQuantilesSketch.html for the memory space required per `k`. I'm not sure why the query exploded in your case though because data seems pretty small. What was `druid.processing.buffer.sizeBytes` set to in your test? You could try either with a smaller `k` or a bigger buffer size.


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