mev-boost timeout

[xanatos]

I use mev-boost 1.6 and lighthouse v4.3.0-dfcb336 on Windows 11

These weeks I had two blocks that timed out in the call to mev-boost. It seems that lighthouse has a hard timeout of 1sec, and twice mev-boost was a little slower (1.1-1.2sec).

Is it possible to increase this timeout?

(I'll add that the block was still generated internally by lighthouse, without the MEV)

The log files of lighthouse and mev-boost:

Lighthouse: Sep 06 xx:34:11.300 INFO Requesting blinded header from connected builder
Lighthouse: Sep 06 xx:34:12.313 INFO Requested blinded execution payloadlocal_response_ms: 10, ..., relay_response_ms: 1013, relay_fee_recipient: request failed, service: exec
Lighthouse: Sep 06 xx:34:12.313 WARN Builder error when requesting payload relay_error: HttpClient(url: http://localhost:18550/, kind: timeout, detail: operation timed out), info: falling back to local execution client, service: exec
Lighthouse: Sep 06 xx:34:12.557 INFO Reconstructing a full block using a local payload, block_hash: ...

MevBoost: time="2023-09-06Txx:34:11.608+02:00" level=info msg="getHeader request start - 608 milliseconds into slot ..." genesisTime=.... slotTimeSec=12 ua=Lighthouse/v4.3.0-dfcb336 version=v1.6
MevBoost: time="2023-09-06Txx:34:12.446+02:00" level=info msg="best bid" blockHash=... blockNumber=.... method=getHeader ... relays="https://aestus.live/" slot=7265869 ua=Lighthouse/v4.3.0-dfcb336 value=... version=v1.6
MevBoost: time="2023-09-06Txx:34:12.446+02:00" level=info msg="http: GET /eth/v1/builder/header/.../..../... 200" duration=0.838280 method=GET path=/eth/v1/builder/header/.../.../... status=200 version=v1.6

I'll add that I've looked for the duration=... in the mev-boost log, and the last blocks that it relayed had:

duration=0.540568
duration=0.363306
duration=0.504703
duration=0.573797
duration=0.367252
duration=0.499827
duration=0.754806 <- Timeout on lighthouse
duration=0.355462
duration=0.838280 <- Timeout on lighthouse

[xanatos]

Annotation: it seems that Nimbus uses 1500ms: status-im/nimbus-eth2#5090
In lighthouse the timeout is set here:

lighthouse/beacon_node/builder_client/src/lib.rs

Lines 17 to 18 in 2841f60

	/// This timeout is in accordance with v0.2.0 of the [builder specs](https://github.com/flashbots/mev-boost/pull/20).
	pub const DEFAULT_GET_HEADER_TIMEOUT_MILLIS: u64 = 1000;

[michaelsproul]

we'll add a new CLI flag: --builder-header-timeout-ms

[eserilev]

Completed in #5857