fix(validator_client): raise soft fd limit

[rkrasiuk]

Issue Addressed

Closes https://github.com/sigp/lighthouse/issues/3468

Proposed Changes

Attempt to raise validator client's fdlimit. OS specific behavior is described in the comments

[CLAassistant]

All committers have signed the CLA.

[rkrasiuk]

@dapplion upgraded the crate. re limiting this behavior - fair enough, we could raise fdlimit based on the current limit and the number of user keys loaded. alternatively, we could expose a CLI flag, that users could pass in case they hit the limit

[dapplion]

alternatively, we could expose a CLI flag, that users could pass in case they hit the limit

This feature is maximally useful when it allows users to not have to think about file limits. Adding a flag defeats the purpose, as after an error the user now has to add a new flag, might as well manually bump the file limit

[paulhauner]

I've pushed this to v5.1.0 since it doesn't seem critical for Deneb.

[pawanjay176]

Pushed back to 5.2 since we want to get networking improvements in the 5.1 release out soon.

[realbigsean]

@mergify queue

[mergify[bot]]

queue

✅ The pull request has been merged automatically

The pull request has been merged automatically at c8ffafb3f8e5022661020354d727b12b573b9e88