Rishabh Singh 74422b58f5
Emit disk spill and merge buffer utilisation metrics for GroupBy queries (#17360)
This change is to emit following metrics as part of GroupByStatsMonitor monitor,
mergeBuffer/used -> Number of merge buffers used.
mergeBuffer/acquisitionTimeNs -> Total time required to acquire merge buffer.
mergeBuffer/acquisition -> Number of queries that acquired a batch of merge buffers.
groupBy/spilledQueries -> Number of queries that spilled onto the disk.
groupBy/spilledBytes-> Spilled bytes on the disk.
groupBy/mergeDictionarySize -> Size of the merging dictionary.
2024-11-22 14:22:03 +05:30
..

This module provides Druid aggregators based on https://datasketches.apache.org/.

Credits: This module is a result of feedback and work done by following people.

https://github.com/cheddar https://github.com/himanshug https://github.com/leerho https://github.com/will-lauer