thanos s3 tier 2 request usage is very high

[doctorpangloss]

There is a mind-numbing amount of arcana related to using thanos with s3 without suffering from insane request costs

#2643

#2389

What is the correct configuration for thanos so that when used as a storage backend for prometheus, which is 99% of people, with s3, which is probably 95% of people, such that there isn't a huge request load?

[dosubot]

Hello @doctorpangloss! I'm here to help you with your Thanos S3 tier 2 request usage issue. Let's figure this out together.

There are a few discussions and issues related to high S3 request usage with Thanos that might be helpful:

1. S3 and high usage of GetObject: This discussion suggests that increasing or adjusting in-memory caching can help reduce the issue. It might be beneficial to set in-memory cache by default to a percentage value of the assigned memory ^[1].

2. Thanos Store generates many requests to S3 storage: The solution here involved reducing requests by setting --sync-block-duration=30m, which was suitable for their case ^[2].

3. Large amount of S3 calls of compactor in small Thanos instance: This open issue suggests adjusting configuration flags to increase the intervals at which certain operations are performed, such as setting --wait-interval=24h and --compact.cleanup-interval=0s to reduce the number of S3 requests ^[3].

These solutions involve tuning the configuration to optimize the request load on S3. You might want to consider these adjustments based on your specific use case and requirements.

To continue talking to Dosu, mention @dosu.

[yeya24]

Can you please share more details about the number of requests to S3 you have?
What types of request those are, GET, EXISTS or something else?
Thanos objstore metrics should tell you what kind of requests to object store you have the most. Do you have any data about which component it comes from? Compactor or Store Gateway?

Have you tried the metadata caches?

[doctorpangloss]

thanos is indeed the cause

[doctorpangloss]

Can you please share more details about the number of requests to S3 you have? What types of request those are, GET, EXISTS or something else? Thanos objstore metrics should tell you what kind of requests to object store you have the most. Do you have any data about which component it comes from? Compactor or Store Gateway?

Have you tried the metadata caches?

Honestly I am overwhelmed by how difficult it is to answer any of these questions. Do you have any advice for investigating this? For now I am simply setting the number of replicas of thanos to zero, because the usage has absolutely exploded.