[GitHub] [druid] gianm edited a comment on issue #9736: HLLSketchMerge aggregator failing for some metrics after upgrade to v0.18

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

gianm edited a comment on issue #9736:
URL: https://github.com/apache/druid/issues/9736#issuecomment-617411096


   @scrawfor Perhaps you could extract and upload just the HLL column? It only contains sketches of data, so it's less sensitive than the entire segment.
   
   A good way to do it is to unzip the segment and look at the `meta.smoosh` file. It has one line per column, where each line has four parts: column name, smoosh file index (usually "0" except for large multipart segments), start byte offset within that smooth file, end byte offset. So for this column:
   
   ```
   diffUrl,0,3316799,5665555
   ```
   
   You could extract it by running:
   
   ```
   dd bs=1 if=00000.smoosh skip=3316799 count=2348756 of=diffUrl
   ```
   
   What I'm after is a binary image of a specific sketch that exhibits the problem — I think once we have that it should be easier to find and fix it.
   
   If it is possible to reproduce this on some test data that would be great too.


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