8307091: A few client tests intermittently throw ConcurrentModificationException

[luchenlin]

Due to JDK-8327137 and JDK-8323670 depends on this, so i will backport this first, and then backport the others.

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Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8307091 needs maintainer approval

Issue

• JDK-8307091: A few client tests intermittently throw ConcurrentModificationException (Bug - P2)

Reviewing

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Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk17u-dev.git pull/2489/head:pull/2489
$ git checkout pull/2489

Update a local copy of the PR:
$ git checkout pull/2489
$ git pull https://git.openjdk.org/jdk17u-dev.git pull/2489/head

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Checkout this PR locally:
$ git pr checkout 2489

View PR using the GUI difftool:
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Download this PR as a diff file:
https://git.openjdk.org/jdk17u-dev/pull/2489.diff

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[bridgekeeper]

👋 Welcome back andrewlu! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[openjdk]

⚠️ @luchenlin This change is now ready for you to apply for maintainer approval. This can be done directly in each associated issue or by using the /approval command.

[mlbridge]

Webrevs

• 00: Full (99e95181)

[TheRealMDoerr]

Why did you close it? We should backport it before we can apply JDK-8323670.

[TheRealMDoerr]

This one is now gating other backports. Please reopen and handle with priority.

[TheRealMDoerr]

Seems like you don't have time at the moment. I'll take it and create a new one.

[TheRealMDoerr]

Continued here: #2551