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Alexey Milovidov 2020-12-16 09:43:05 +03:00
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src/Storages/MergeTree/SimpleMergeSelector.h
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@ -58,9 +58,9 @@ It's still unclear if this algorithm is good or optimal at all. It's unclear if
To test and optimize SimpleMergeSelector, we apply the following methods: To test and optimize SimpleMergeSelector, we apply the following methods:
- insert/merge simulator: a model simulating parts insertion and merging; - insert/merge simulator: a model simulating parts insertion and merging;
merge selecting algorithm is applied and the relevant metrics are calculated to allow to tune the algorithm; merge selecting algorithm is applied and the relevant metrics are calculated to allow to tune the algorithm;
- insert/merge simulator on real `system.part_log` from production - it gives realistic information about inserted data parts: - insert/merge simulator on real `system.part_log` from production - it gives realistic information about inserted data parts:
their sizes, at what time intervals they are inserted; their sizes, at what time intervals they are inserted;
There is a research thesis dedicated to optimization of merge algorithm: There is a research thesis dedicated to optimization of merge algorithm:
https://presentations.clickhouse.tech/hse_2019/merge_algorithm.pptx https://presentations.clickhouse.tech/hse_2019/merge_algorithm.pptx