8304885: Reuse stale data to improve DNS resolver resiliency

[mrserb]

Hi all,

This pull request contains a backport of commit bdd81b31 from the openjdk/jdk repository.

The commit being backported was authored by Sergey Bylokhov on 9 Jun 2023 and was reviewed by Michael McMahon and Daniel Fuchs.

CSR is approved for JDK 21: https://bugs.openjdk.org/browse/JDK-8306653
"jdk21-enhancement-yes" label is added to the JBS.

Thanks!

---

Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• Change requires CSR request JDK-8306653 to be approved

Issues

• JDK-8304885: Reuse stale data to improve DNS resolver resiliency (Enhancement - P3)
• JDK-8306653: Reuse stale data to improve DNS resolver resiliency (CSR)

Reviewers

• Daniel Jeliński (@djelinski - Reviewer)
• Michael McMahon (@Michael-Mc-Mahon - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21.git pull/53/head:pull/53
$ git checkout pull/53

Update a local copy of the PR:
$ git checkout pull/53
$ git pull https://git.openjdk.org/jdk21.git pull/53/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 53

View PR using the GUI difftool:
$ git pr show -t 53

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk21/pull/53.diff

Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back serb! 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 backport pull request has now been updated with issue from the original commit.

[openjdk]

@mrserb The following labels will be automatically applied to this pull request:

• net
• security

When this pull request is ready to be reviewed, an "RFR" email will be sent to the corresponding mailing lists. If you would like to change these labels, use the /label pull request command.

[mlbridge]

Webrevs

• 00: Full (e0e8d372)

[openjdk]

@mrserb This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8304885: Reuse stale data to improve DNS resolver resiliency

Reviewed-by: djelinski, michaelm

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 13 new commits pushed to the master branch:

• e86d765: 8309853: StructuredTaskScope.join description improvements
• 2f1af3c: 8309296: jdk/jfr/event/runtime/TestAgentEvent.java fails due to "missing" dynamic JavaAgent
• 6317249: 8310187: Improve Generational ZGC jtreg testing
• 55aa4cb: 8309498: [JVMCI] race in CallSiteTargetValue recording
• 5357bcd: 8308855: ARM32: TestBooleanVector crashes after 8300257
• 7621d98: 8309266: C2: assert(final_con == (jlong)final_int) failed: final value should be integer
• 89ac41b: 8310126: C1: Missing receiver null check in Reference::get intrinsic
• 789b2fc: 8302865: Illegal bytecode for break from if with instanceof pattern matching condition
• ceadaec: 8310133: Effectivelly final condition not enforced in guards for binding variables from the same case
• f8a38ee: 8309612: [REDO] JDK-8307153 JVMTI GetThreadState on carrier should return STATE_WAITING
• ... and 3 more: https://git.openjdk.org/jdk21/compare/1fc60429a1565ca5357de08c53df53af5d24278f...master

As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[mrserb]

/integrate

[openjdk]

Going to push as commit 8b12726.
Since your change was applied there have been 13 commits pushed to the master branch:

• e86d765: 8309853: StructuredTaskScope.join description improvements
• 2f1af3c: 8309296: jdk/jfr/event/runtime/TestAgentEvent.java fails due to "missing" dynamic JavaAgent
• 6317249: 8310187: Improve Generational ZGC jtreg testing
• 55aa4cb: 8309498: [JVMCI] race in CallSiteTargetValue recording
• 5357bcd: 8308855: ARM32: TestBooleanVector crashes after 8300257
• 7621d98: 8309266: C2: assert(final_con == (jlong)final_int) failed: final value should be integer
• 89ac41b: 8310126: C1: Missing receiver null check in Reference::get intrinsic
• 789b2fc: 8302865: Illegal bytecode for break from if with instanceof pattern matching condition
• ceadaec: 8310133: Effectivelly final condition not enforced in guards for binding variables from the same case
• f8a38ee: 8309612: [REDO] JDK-8307153 JVMTI GetThreadState on carrier should return STATE_WAITING
• ... and 3 more: https://git.openjdk.org/jdk21/compare/1fc60429a1565ca5357de08c53df53af5d24278f...master

Your commit was automatically rebased without conflicts.

[openjdk]

@mrserb Pushed as commit 8b12726.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.