proxy: pre-calculate hash at leaf nodes

[GiedriusS]

Is your proposal related to a problem?

We could increase the performance by calculating the hash of a chunk at the leaf node instead of the querier: https://github.com/thanos-io/thanos/pull/5296#discussion_r966899425

Describe the solution you'd like

Add another field with the hash and use it.

[yeya24]

Add another field with the hash and use it.

Can you please elaborate more on where to add the field for hashes? The Series API?

[pedro-stanaka]

Once we have more details here, I would be inclined to take a stab at solving this one.

[GiedriusS]

Idea is to calculate this hash by the sender so that it would be less work on the querier (:

[yeya24]

https://github.com/thanos-io/thanos/blob/32a6c4e03a/pkg/store/storepb/types.proto#L23 If I understand correctly, we can add one more nullable hash field to the chunk itself and populate it at stores?

[pedro-stanaka]

@GiedriusS can we close this in light of #5703 ?

[GiedriusS]

Yep :+1: thanks for your work on this! :muscle: