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Posted to commits@druid.apache.org by GitBox <gi...@apache.org> on 2019/08/19 13:25:17 UTC
[GitHub] [incubator-druid] leventov opened a new issue #8336: Cache-aware
choice of `TopNParams.numValuesPerPass`
leventov opened a new issue #8336: Cache-aware choice of `TopNParams.numValuesPerPass`
URL: https://github.com/apache/incubator-druid/issues/8336
Currently, the available processing buffer is always used in full:
https://github.com/apache/incubator-druid/blob/566dc8c719489283f9190cefd6346bbb3f12955f/processing/src/main/java/org/apache/druid/query/topn/PooledTopNAlgorithm.java#L255
But this may not be optimal in certain cases, as demonstrated in [this post](https://lemire.me/blog/2019/08/16/faster-threshold-queries-with-cache-sensitive-scancount/) by @lemire.
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