upgrade to etcd/v3.

[tutumagi]

upgrade to etcd/v3. So we donnot need to replace grpc package to the lower version.

[cupen]

It seems that etcd-v3.5 is coming soon.
etcd-io/etcd#12970

[tutumagi]

It seems that etcd-v3.5 is coming soon.
etcd-io/etcd#12970

Yep, we can upgrade to the official 3.5 version later.

[cupen]

@tutumagi etcdv3.5 is released. Let's go! 💪
https://github.com/etcd-io/etcd/releases/tag/v3.5.0

[tutumagi]

I will merge in next week.

[cupen]

I will merge in next week.

@tutumagi Hello, your pr is picked here. #494 Thanks for your work.

/cc @rogeralsing

[tutumagi]

I have upgrade etcd to v3.5.0 on my fork branch. And what should I do next?

[cupen]

@tutumagi Run the example _examples/cluster-restartgracefully with etcd.
It also use gpc-v1.26 in go.mod. Just remove it like this pr ad09928

cd _examples/cluster-restartgracefully
make start-with-etcd

If every things is OK, you'll see some logs like:

2021/06/23 11:15:56 INFO  [Example]     requests grainId="client-1" status="start" 
2021/06/23 11:15:56 INFO  [Example]     requests grainId="client-8" status="start" 
2021/06/23 11:15:56 INFO  [Example]     requests grainId="client-2" status="start" 
2021/06/23 11:15:56 INFO  [Example]     requests grainId="client-5" status="start" 
2021/06/23 11:15:56 INFO  [Example]     requests grainId="client-7" status="start" 
2021/06/23 11:15:56 INFO  [Example]     requests grainId="client-9" status="start" 
2021/06/23 11:15:56 INFO  [Example]     requests grainId="client-4" status="start" 
2021/06/23 11:15:56 INFO  [Example]     requests grainId="client-0" status="start" 
2021/06/23 11:15:56 INFO  [Example]     requests grainId="client-6" status="start" 
2021/06/23 11:15:56 INFO  [Example]     requests grainId="client-3" status="start" 
2021/06/23 11:15:57 INFO  [Example]     requests grainId="client-8" status="end" loops=10000 take=1.337590244s 
2021/06/23 11:15:57 INFO  [Example]     requests grainId="client-1" status="end" loops=10000 take=1.337777042s 
2021/06/23 11:15:57 INFO  [Example]     requests grainId="client-9" status="end" loops=10000 take=1.432898883s 
2021/06/23 11:15:57 INFO  [Example]     requests grainId="client-5" status="end" loops=10000 take=1.432832689s 
2021/06/23 11:15:57 INFO  [Example]     requests grainId="client-0" status="end" loops=10000 take=1.436307804s 
2021/06/23 11:15:57 INFO  [Example]     requests grainId="client-4" status="end" loops=10000 take=1.513899654s 
2021/06/23 11:15:57 INFO  [Example]     requests grainId="client-2" status="end" loops=10000 take=1.515489662s 
2021/06/23 11:15:57 INFO  [Example]     requests grainId="client-7" status="end" loops=10000 take=1.51621749s 
2021/06/23 11:15:57 INFO  [Example]     requests grainId="client-3" status="end" loops=10000 take=1.516710336s 
2021/06/23 11:15:57 INFO  [Example]     requests grainId="client-6" status="end" loops=10000 take=1.517275484s 
2021/06/23 11:15:57 INFO  [Example]     end all. clients=10 total=100000 req/s=100000 take=1.517514248s 
2021/06/23 11:15:57 INFO  [Example]     countinue? (y/n)

Then renew all of the go.mod of examples.

cd _examples
make go.mod

BTW: I'll close my pr #494 if you want to finish yours.

[tutumagi]

The merge done. And test _examples/cluster-restartgracefully works well.

[cupen]

@tutumagi I think we can use git rebase and git squash for reduce redundant commits.
https://www.git-tower.com/learn/git/faq/git-squash/

btw: This pr is useful. I'll merge it into my personal branch.
cc @rogeralsing

[cupen]

@tutumagi Oh, a month has passed, sorry for delay. And I hope you don't mind me talking a lot.

[rogeralsing]

What is the status on this one?

[cupen]

@rogeralsing

What is the status on this one?

Test OK on my branch. It's ready to merge.