Fix using unavailable worker cached in client-pool to resolve #18693

[yws-tracy]

What changes are proposed in this pull request?

to fix #18693

Why are the changes needed?

In ClientPool, ClientPoolKey only takes ip into consideration, which is not enough, it can cause incorrect worker cache in clientPool. To fix the problem, hostName should be taken into consideration to compare ClientPoolKey as well

Does this PR introduce any user facing changes?

No

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[YichuanSun]

Thanks for your pr! But are your sure you want to submit to main branch? If you want to fix the 2.x issue, please submit to master-2.x branch.

[yws-tracy]

Thanks for your pr! But are your sure you want to submit to main branch? If you want to fix the 2.x issue, please submit to master-2.x branch.

Thanks for your reply, I think main branch still has the problem, and I will also submit to master-2.x branch.

[alluxio-bot]

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[alluxio-bot]

Automated checks report:

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