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VictoriaMetrics/app/vmstorage
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Zakhar Bessarab 8198e7241d
lib/mergeset: add sparse indexdb cache (#7269) 
Related issue:
https://github.com/VictoriaMetrics/VictoriaMetrics/issues/7182

- add a separate index cache for searches which might read through large
amounts of random entries. Primary use-case for this is retention and
downsampling filters, when applying filters background merge needs to
fetch large amount of random entries which pollutes an index cache.
Using different caches allows to reduce effect on memory usage and cache
efficiency of the main cache while still having high cache hit rate. A
separate cache size is 5% of allowed memory.

- reduce size of indexdb/dataBlocks cache in order to free memory for
new sparse cache. Reduced size by 5% and moved this to a separate cache.

- add a separate metricName search which does not cache metric names -
this is needed in order to allow disabling metric name caching when
applying downsampling/retention filters. Applying filters during
background merge accesses random entries, this fills up cache and does
not provide an actual improvement due to random access nature.

Merge performance and memory usage stats before and after the change:

- before

![image](https://github.com/user-attachments/assets/485fffbb-c225-47ae-b5c5-bc8a7c57b36e)

- after

![image](https://github.com/user-attachments/assets/f4ba3440-7c1c-4ec1-bc54-4d2ab431eef5)

---------

Signed-off-by: Zakhar Bessarab <z.bessarab@victoriametrics.com>
(cherry picked from commit 837d0d136d)
2024-10-24 12:43:06 -03:00
..
deployment all: suppress InvalidDefaultArgInFrom warning emitted by docker build when building Docker packages via make package-* command 2024-09-03 14:05:43 +02:00
multiarch app/*/multiarch: return back empty value for TARGETARCH 2024-09-06 18:15:22 +02:00
servers vmstorage: auto calculate maxUniqueTimeseries based on resources (#6961) 2024-10-18 13:41:43 +02:00
main.go lib/mergeset: add sparse indexdb cache (#7269) 2024-10-24 12:43:06 -03:00
Makefile make: add darwin builds for cluster (#7195) 2024-10-08 10:19:04 +02:00
README.md all: open-sourcing cluster version 2019-05-23 00:25:38 +03:00

README.md

vmstorage performs the following tasks:

  • Accepts inserts from vminsert nodes and stores them to local storage.

  • Performs select requests from vmselect nodes.