gomod: update pdclient to support backoff mechanism for memberLoop (#46769)

[ti-chi-bot]

This is an automated cherry-pick of #46769

Signed-off-by: husharp [email protected]<!--

Thank you for contributing to TiDB!

PR Title Format:

1. pkg [, pkg2, pkg3]: what's changed
2. *: what's changed

-->

What problem does this PR solve?

Issue Number: close #46770, ref tikv/pd#6556

Problem Summary:

• Add backoff mechanism
  When waiting for the goroutine to update, the expo function can be used to backoff to sleep when an error is encountered.

PR Summary

Add backoff mechanism

• When waiting for the goroutine to update, the expo function can be used to backoff to sleep when an error is encountered.

Reproduce Step

1. enable fail point, like gRPC is throttling, cannot read from etcd.
   curl -X PUT -d 'return(10)' http://tc-pd-1.tc-pd-peer.csn-simulator-big-cluster-vd62g.svc:2379/pd/api/v1/fail/github.com/tikv/pd/pkg/etcdutil/SlowEtcdKVGet

2. simulate pd lost leader
   curl -X PUT -d 'return("2346857576170797299")' http://tc-pd-1.tc-pd-peer.csn-simulator-big-cluster-vd62g.svc:2379/pd/api/v1/fail/github.com/tikv/pd/server/exitCampaignLeader

Reproduce Result

Grpc request GetMember keeps high:

TiKV side show

PR Effect

The Grpc GetMember call was reduced from 3.2k to 170, which is relative to the TiDB numbers and client requests for triaging checkLeader.

For 20 * tidb 3 * PD 50 * TiKV
170 = (50 * 3 / 3 / 3[TiKV side] + 20 * 2 [TiDB side]) * 3[PD Num]

And more tests are necessary to ensure that no further issues arise.

What is changed and how it works?

Check List

test by pd
Tests

• Unit test
• Integration test

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

update pdclient to support backoff mechanism for memberLoop

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign tammyxia for approval. For more information see the Kubernetes Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick, it must first be approved by the collaborators.

AFTER it has been approved by collaborators, please ping the release team in a comment to request a cherry pick review.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[HuSharp]

/close
because release-6.5 had been updated by #46616 (files)

[ti-chi-bot]

@HuSharp: Closed this PR.

In response to this:

/close
because release-6.5 had been updated by #46616 (files)

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.