RFR: 8308475: Make the thread dump files generated by jcmd Thread.dump_to_file jtreg failure handler action easily accessible

[David Holmes]

On Thu, 25 May 2023 04:46:04 GMT, Jaikiran Pai <jpai at openjdk.org> wrote:

>> Can I please get a review of this change which proposes to improve the accessibility of the thread dump files that are generated by the `jcmd Thread.dump_to_file` command configured in the failure handler configurations? This addresses https://bugs.openjdk.org/browse/JDK-8308475. 
>> 
>> The changes in this PR include:
>>  - Enhancement to `GatherProcessInfoTimeoutHandler` to allow configuring a `successArtifacts` action parameter which can be used to generate links to files that are generated by the failure handler commands.
>>  - Introduction of a `%iterCount` token to allow ability to refer to the current iteration when the command is repeated
>>  - The `jcmd Thread.dump_to_file` is now configured to create the thread dumps in `json` format. Additionally, it has now been configured to create the thread dumps 6 times, just like the `jstack` command.
>> 
>> Detailed explanation of the `successArtifacts` parameter and the `%iterCount` token is provided in the JBS comment here https://bugs.openjdk.org/browse/JDK-8308475?focusedCommentId=14583072&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14583072
>> 
>> Tests have been run locally with this change and tier1, tier2 and tier3 tests on CI system to verify this change works and doesn't cause regression.
>
> Thank you Leonid for the review.
> 
> Since this is tagged hotspot, can I please get a second Reviewer to review this please?

@jaikiran I don't know why @AlanBateman tagged this as Hotspot as there are no hotspot related changes. Perhaps it was just for visibility of shared failure handler changes? But I don't think you need a Hotspot review here.

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PR Comment: https://git.openjdk.org/jdk/pull/14071#issuecomment-1562403634