[GitHub] [druid] lsee9 commented on issue #11544: "java.lang.NullPointerException" occurs when using APPROX_QUANTILE_DS

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

lsee9 commented on issue #11544:
URL: https://github.com/apache/druid/issues/11544#issuecomment-893177092


   Hi @jihoonson, thank you for your reply:)
   I'll tell you what I tried.
   
   My druid spec:
   ```json
   druid.processing.buffer.sizeBytes=1GiB
   druid.processing.numMergeBuffers=10
   druid.processing.numThreads=19 (20 core machine)
   MaxDirectMemorySize=30g
   heap size=32g
   ```
   BUT, For k = 128, the problem still occurs.
   Should I increase more??
   
   And, I tried with a smaller k (k = 32, 64).
   Then no error occurs.(I'm going to check a wider time range(more data)).
   But the deviation of the values ​​is too large. (e.g. quantile 0 ~ 2000 in some cases)
   So I don't know if I can use this.
   
   If you have any good ideas, please reply!


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