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Specify builder_comparison_factor #386

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merged 7 commits into from
Dec 21, 2023
Merged

Specify builder_comparison_factor #386

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7c76953
Specify `builder_comparison_factor`
michaelsproul Dec 11, 2023
bfb254c
Spellcheck
michaelsproul Dec 11, 2023
b0cbcc9
Clarify default & error behaviour
michaelsproul Dec 11, 2023
e5b1045
Clarify local terminology & improve rounding behaviour
michaelsproul Dec 12, 2023
e596deb
Merge branch 'master' into comparison-factor
rolfyone Dec 14, 2023
af4cd82
Merge branch 'master' into comparison-factor
rolfyone Dec 18, 2023
6f68742
Update apis/validator/block.v3.yaml
rolfyone Dec 21, 2023
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32 changes: 32 additions & 0 deletions apis/validator/block.v3.yaml
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Expand Up @@ -43,6 +43,38 @@ get:
is a flag and does not take a value.
schema: {}
allowEmptyValue: true
- name: builder_comparison_factor
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in: query
required: false
description: |
Percentage multiplier to apply to the builder's payload value when choosing between a
builder payload header and a local payload. This parameter is only relevant if the beacon
node is connected to a builder, deems it safe to produce a builder payload, and receives
valid responses from both the builder endpoint _and_ the local execution node. When these
preconditions are met, the server MUST act as follows:

* if `local_payload_value >= builder_comparison_factor * builder_payload_value // 100`, then
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return a full (unblinded) block containing the local payload.
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* otherwise, return a blinded block containing the builder payload header.

Servers must support the following values of the comparison factor which encode common
preferences:

* `builder_comparison_factor=0`: prefer the local payload unless an error makes it
unviable.
* `builder_comparison_factor=100`: default profit maximization mode; choose whichever
payload pays more.
* `builder_comparison_factor=2**64 - 1`: prefer the builder payload unless an error or
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What does this mean? if the beacon health check makes it unviable, should we return the local payload or error out?

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(as discussed on Discord) local payload

beacon node health check makes it unviable.
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Suggested change
* `builder_comparison_factor=2**64 - 1`: prefer the builder payload unless an error or
beacon node health check makes it unviable.
* `builder_comparison_factor=2**64 - 1`: prefer the builder payload unless an error
makes it unviable or beacon node health check makes it unviable.

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I'm not really opposed to this, but how is this this an improvement?

Also, if nothing else, the grammar's wonky now: "beacon node health check" lacks an article or other similarly-functioning word. Before, it shared an with error, but this removes that linkage.

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@dapplion dapplion Dec 11, 2023 •
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Why not just

 * `builder_comparison_factor=2**64 - 1`: prefer the builder payload unless
    an error makes it unviable.

@michaelsproul why is a "beacon node health check" relevant here?

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@michaelsproul michaelsproul Dec 11, 2023 •
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I wanted to flag that a health check would be the most likely reason a local block would be returned when the user greatly prefers a builder block.


Servers should use saturating arithmetic or another technique to ensure that large values
of the `builder_comparison_factor` do not trigger overflows or errors.
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If this parameter is provided and the beacon node is not configured with a builder then
the beacon node MUST respond with a full local block, which the caller can choose to reject
if it wishes.
schema:
$ref: "../../beacon-node-oapi.yaml#/components/schemas/Uint64"
responses:
"200":
description: Success response
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