Add extensible background build discarders #4368

daniel-beck · 2019-11-22T15:21:24Z

(Description updated 2019-12-15)

This is the extensible implementation of #4336, allowing to pull out regex matching into a plugin.

A new extension point for configuring global build discarders is added to core. These are run:

After a build finishes, for the given job.
Periodically.

It provides two simple implementations of a new extension point in core:

Run the already configured per-project build discarder (can probably be considered a bug fix, and is therefore enabled by default).
Run a specific, globally configured build discarder on all jobs.

Additionally, the API for the new extension point BackgroundBuildDiscarderStrategy should be flexible enough to support regexes and other complex criteria as discussed in the original issue #4336.

Screenshot:

Configuration UI:

Manual testing hint: Trigger periodic execution manually using ExtensionList.lookupSingleton(BackgroundBuildDiscarder.class).doRun() in script console.

On classification: Major bug if the lack of periodic execution of the configured build rotator is considered a bug at all, as it could result in data loss with carelessly configured projects relying on the previous behavior.

TODO List:

Internalization
Basic test coverage
Help files
Better symbols ("global" is overloaded)
Rename classes and update labels as needed since it's no longer just "periodic"

Open Questions (feedback welcome):

Should the "Job" Global Build Discarder be implemented differently, without a UI option? If we actually consider it to be a bug fix (see above and below), why would there be a UI that boils down to "[x] fix the bug"?
Should we really limit each descriptor to one occurrence? This should make it more difficult to implement more flexible strategies, e.g. the proposed "regex match" one would need its own list of (regex/build discarder) pairs, rather than just one of each as a property, and then have N instances of the extension in the top level list…

Proposed changelog entries

Major RFE: Add globally configured build discarders that delete old builds not marked as "keep forever" even if there is no, or a less aggressive, per-project build discarder configured, executed periodically and after a build finishes.
Major Bug: Jenkins will by default execute the configured per-project build discarder periodically even if no build is currently finishing. This may delete old builds of projects that got a more aggressive build discarder configuration since the last build was run.
RFE: Developer: Add new extension point BackgroundBuildDiscarderStrategy to allow more flexible build discarding strategies for the global build discarder configuration.

Submitter checklist

JIRA issue is well described
Changelog entry appropriate for the audience affected by the change (users or developer, depending on the change). Examples
* Use the Internal: prefix if the change has no user-visible impact (API, test frameworks, etc.)
Appropriate autotests or explanation to why this change has no tests
For dependency updates: links to external changelogs and, if possible, full diffs

Desired reviewers

@awittha (author of #4336)
@res0nance (reviewer of #4336)

Default implementation: Run per-job configured discarder periodically

awittha · 2019-11-22T15:32:29Z

core/src/main/java/jenkins/model/BackgroundBuildDiscarder.java

+                        strategy.apply(job);
+                    } catch (Exception ex) {
+                        listener.error("An exception occurred when executing " + displayName + ": " + ex.getMessage());
+                        LOGGER.log(Level.WARNING, "An exception occurred when executing " + displayName, ex);


💯 for logging with listener and the Java logger 👍

awittha · 2019-11-22T15:36:01Z

core/src/main/java/jenkins/model/BackgroundBuildDiscarderStrategy.java

+            try {
+                apply(run);
+            } catch (IOException|InterruptedException ex) {
+                // TODO should these actually be caught, or just thrown up to stop applying?


IMO, IOException should be logged well, but chomped. One "bad" build in a project with 1000 builds shouldn't block attempts to clean up the other 999.

InterruptedException is a little less-certain: Since this would be happening in the background, what can raise an InterruptedException in a background task? If there's anything that thinks it will stop a BG task by interrupting it, we'd like to honor that semantic.

If it's more of a "well, threads get interrupted sometimes and that checked exception is part of the Java interface," then, chomp & log along with IOException.

core/src/main/java/jenkins/model/GlobalBuildDiscarderStrategy.java

res0nance · 2019-11-22T15:49:18Z

core/src/main/resources/hudson/model/Run/logKeep.jelly

@@ -27,7 +27,7 @@ THE SOFTWARE.
 -->
 <?jelly escape-by-default='true'?>
 <j:jelly xmlns:j="jelly:core" xmlns:st="jelly:stapler" xmlns:d="jelly:define" xmlns:l="/lib/layout" xmlns:t="/lib/hudson" xmlns:f="/lib/form" xmlns:i="jelly:fmt">
-  <j:if test="${it.parent.buildDiscarder!=null and it.canToggleLogKeep()}">
+  <j:if test="${it.canToggleLogKeep()}">


🥇 for remembering to enable Keep Build Forever button in the case where a explicit build discarder isn't set for the job

res0nance · 2019-11-22T15:52:52Z

core/src/main/java/jenkins/model/GlobalBuildDiscarderStrategy.java

+        this.discarder = discarder;
+    }
+
+    public BuildDiscarder getDiscarder() {


Nit: @CheckForNull to catch potential bugs

timja · 2019-11-23T09:39:53Z

I've tested this with jcasc, it works, but it's not possible to remove build discarders :(

i.e. this:

unclassified:
  globalBuildDiscarders:
    configuredBuildDiscarders:
    - globalBuildDiscarder:
        discarder:
          logRotator:
            artifactDaysToKeepStr: "15"
            artifactNumToKeepStr: "12"
            daysToKeepStr: "11"
            numToKeepStr: "10"
    - "jobBuildDiscarder"

to

unclassified:
  globalBuildDiscarders:
    configuredBuildDiscarders:
    - globalBuildDiscarder:
        discarder:
          logRotator:
            artifactDaysToKeepStr: "15"
            artifactNumToKeepStr: "12"
            daysToKeepStr: "11"
            numToKeepStr: "10"

doesn't remove jobBuildDiscarder

daniel-beck · 2019-11-23T22:35:02Z

@timja Interesting. Did you try to change some of the values to see whether any kind of update works at all? Or what happens when you go from only globalBuildDiscarder to only jobBuildDiscarder?

daniel-beck · 2019-11-23T22:35:44Z

Note to self: Come up with some symbols that don't result in

  globalBuildDiscarders:
    configuredBuildDiscarders:
    - globalBuildDiscarder:

timja · 2019-11-24T10:55:50Z

@timja Interesting. Did you try to change some of the values to see whether any kind of update works at all? Or what happens when you go from only globalBuildDiscarder to only jobBuildDiscarder?

I tried changing values and that worked

timja · 2019-11-24T10:56:38Z

@timja Interesting. Did you try to change some of the values to see whether any kind of update works at all? Or what happens when you go from only globalBuildDiscarder to only jobBuildDiscarder?

removing was ignored

daniel-beck · 2019-11-25T11:52:27Z

@timja Thanks for that. Weird.

I basically use the same approach as @Symbol(value="artifactManager") does, to get databinding from f:repeatableHeteroProperty for free. Does the same problem exist there as well (hinting at a problem with core or JCasC rather than this PR)? Implementations there are from https://jenkins.io/doc/developer/extensions/jenkins-core/#artifactmanagerfactory

timja · 2019-11-26T20:24:35Z

@timja Thanks for that. Weird.

I basically use the same approach as @Symbol(value="artifactManager") does, to get databinding from f:repeatableHeteroProperty for free. Does the same problem exist there as well (hinting at a problem with core or JCasC rather than this PR)? Implementations there are from jenkins.io/doc/developer/extensions/jenkins-core/#artifactmanagerfactory

No the same problem does not exist there,
I installed all 3 plugins,

Configured with this:

unclassified:
  artifactManager:
    artifactManagerFactories:
    - "compressing"
    - azure:
        config:
          container: "abcd"
          prefix: "abc"

And then I updated it to:

unclassified:
  artifactManager:
    artifactManagerFactories:
    - azure:
        config:
          container: "abcdf"
          prefix: "abc"

It removed compressing and updated the azure container config correctly

timja · 2019-11-26T20:46:12Z

Weird I just tested this PR again and JCasC wise everything is working, (except some symbols would be nice to shorten the names)

daniel-beck · 2019-11-26T21:37:39Z

@timja

some symbols would be nice to shorten the names

Which symbols are missing/wrong? Based on #4368 (comment) it looks OK to me. The ambiguous double use of "global" I already know and plan to fix.

timja · 2019-11-26T21:45:40Z

@timja

some symbols would be nice to shorten the names

Which symbols are missing/wrong? Based on #4368 (comment) it looks OK to me. The ambiguous double use of "global" I already know and plan to fix.

original:

unclassified:
  globalBuildDiscarders:
    configuredBuildDiscarders:
    - globalBuildDiscarder:
        discarder:
          logRotator:
            artifactDaysToKeepStr: "15"
            artifactNumToKeepStr: "12"
            daysToKeepStr: "11"
            numToKeepStr: "10"
    - "jobBuildDiscarder"

possibly something like this (if symbols don't clash):

unclassified:
  globalBuildDiscarders:
    configured:
    - global:
        discarder:
          logRotator:
            artifactDaysToKeepStr: "15"
            artifactNumToKeepStr: "12"
            daysToKeepStr: "11"
            numToKeepStr: "10"
    - "job"

Ideally it would be flattened to not need the discarder and configuredBuildDiscarders or configured renamed to something else

but it works so 🤷‍♂

daniel-beck · 2019-12-08T18:04:35Z

This update now applies the globally configured build discarders after a build finishes so they're no longer only running once an hour. Labels (and probably class names…) are not yet updated accordingly and will still need to be.

Naming is hard 😦

daniel-beck · 2019-12-08T20:19:41Z

Ideally it would be flattened to not need the discarder and configuredBuildDiscarders

@timja
I don't think the former is possible at all. The latter would require the extension class itself to be a List, which doesn't look like a great approach. Or how else would I do this?

timja · 2019-12-08T20:32:58Z

Ideally it would be flattened to not need the discarder and configuredBuildDiscarders

@timja
I don't think the former is possible at all. The latter would require the extension class itself to be a List, which doesn't look like a great approach. Or how else would I do this?

Hmm, been taking a look around,
I can't see a way, it looks like it just comes down to naming to make it sensible.

This is what the configuration now looks like:

unclassified:
  buildDiscarders:
    configuredBuildDiscarders:
      - "jobBuildDiscarder"
      - globalBuildDiscarder:
          discarder:
            logRotator:
              daysToKeepStr: "7"
              numToKeepStr: "10"

core/src/main/java/jenkins/model/GlobalBuildDiscarderConfiguration.java

core/src/main/resources/jenkins/model/JobBackgroundBuildDiscarderStrategy/config.properties

timja · 2019-12-16T00:06:02Z

Requested review from everyone who reviewed the previous PR #4336

res0nance · 2019-12-16T01:37:50Z

core/src/main/java/jenkins/model/BackgroundGlobalBuildDiscarder.java

+            String displayName = strategy.getDescriptor().getDisplayName();
+            listener.getLogger().println("Offering " + job.getFullName() + " to " + displayName);
+            if (strategy.isApplicable(job)) {
+                listener.getLogger().println(job.getFullName() + " accepted by " + displayName);


I'm slightly concerned that this might be excessive logging on very large instances

Maybe, but it's all going to a rotated set of log files, so will never fill up a disk (except when it's tiny to begin with):

jenkins/core/src/main/java/hudson/model/AsyncPeriodicWork.java

Lines 134 to 156 in eedf2a4

if (f.isFile()) {

if ((lastRotateMillis + logRotateMillis < System.currentTimeMillis())

|| (logRotateSize > 0 && f.length() > logRotateSize)) {

lastRotateMillis = System.currentTimeMillis();

File prev = null;

for (int i = 5; i >= 0; i--) {

File curr = i == 0 ? f : new File(f.getParentFile(), f.getName() + "." + i);

if (curr.isFile()) {

if (prev != null && !prev.exists()) {

if (!curr.renameTo(prev)) {

logger.log(getErrorLoggingLevel(), "Could not rotate log files {0} to {1}",

new Object[]{curr, prev});

}

} else {

if (!curr.delete()) {

logger.log(getErrorLoggingLevel(), "Could not delete log file {0} to enable rotation",

curr);

}

}

}

prev = curr;

}

}

res0nance

Overall, this looks fine to me

daniel-beck · 2019-12-16T10:01:41Z

Added another Open Question to the PR comment for reviewers' consideration.

jvz · 2019-12-16T19:49:19Z

core/src/main/java/jenkins/model/GlobalBuildDiscarderStrategy.java

+            try {
+                apply(run);
+            } catch (IOException|InterruptedException ex) {
+                // TODO should these actually be caught, or just thrown up to stop applying?


Whenever you catch an InterruptedException, it's usually a good idea to re-set the interrupt flag again via Thread.currentThread().interrupt(); Otherwise, you can end up with hung threads if they continue running (which in this case, it very well could).

So I would not actually want to catch the InterruptedException here? The idea was that if there's something wrong with deleting one build's artifacts, e.g. it taking too long to delete a billion files, an initial abort would continue with the next build, rather than just stop this process entirely.

Obviously the downside of that is that it's fairly difficult to really interrupt this thread while it's iterating here.

fairly difficult to really interrupt this thread while it's iterating here.

What processes will intentionally attempt such an interrupt? Is there any jenkins-initiated or user-initiated workflow that can target a specific AsyncPeriodicWork and try to stop it?

Setting the interrupt flag doesn't re-throw the interrupted exception btw.

I was about to leave a comment about this and noticed that I already did.

@daniel-beck Are you planning on making this change? either not catching the InterruptedException or setting the interrupt flag?

awittha · 2019-12-16T20:27:51Z

core/src/main/resources/jenkins/model/JobGlobalBuildDiscarderStrategy/config.properties

@@ -0,0 +1,3 @@
+blurb = Build discarders configured for a job are only run after a build finishes. \
+  This option runs jobs'' configured build discarders periodically, applying configuration changes even when no new builds are run. \


applying configuration changes even when no new builds are run.

This wording seems a bit confusing to me. From where will configuration changes that can be applied to the job come, if not from the job itself?

What kind of configuration change could exist but in an "unapplied" state, that this option would apply?

Should it read

applying build discarder rules even when no new builds are run

or is it really talking about job configuration?

or is it really talking about job configuration?

Well, build discarder rules are a part of the job configuration. So in a sense, yes.

Currently, you'd need to run a new build to apply a changed build discarder configuration, since it's only consulted after a build finishes. So without new builds, you can change this option and it doesn't have any consequences. For an obsolete/archived job, it would never actually delete builds/artifacts.

Perhaps

…applying changes to a job's build discarder configuration even when…

?

awittha · 2019-12-16T20:37:20Z

core/src/main/java/jenkins/model/JobGlobalBuildDiscarderStrategy.java

+
+    @Override
+    public void apply(Job<?, ?> job) throws IOException, InterruptedException {
+        job.logRotate();


Job is a non-final, public, abstract class, and logRotate() is a non-final, public method on Job - and neither are annotated with @NoExternalUse.

It is not guaranteed that job.logRotate() will actually use the build discarder that was checked in isApplicable(...). This may cause the documentation around this step to fail to align with what actually happens.

Is there a reason to prefer job.logRotate() over job.getBuildDiscarder().perform( job )?

Good question. I think the expectation is that #logRotate() not be overridden, but it's not enforced, true.

I am unsure which is the more correct option.

#logRotate() is called by Run#execute(RunExecution), so an argument can be made that this is the expected way to rotate logs, and if the job overrides it in a way that differs from what getBuildDiscarder().perform(…) does, #logRotate() should be take precedence.

OTOH, the way this feature is explained on the UI would indicate we want getBuildDiscarder().perform(…) instead. Obviously, much of that is by necessity.

awittha · 2019-12-16T20:39:11Z

core/src/main/java/jenkins/model/BackgroundGlobalBuildDiscarder.java

+    private static final Logger LOGGER = Logger.getLogger(BackgroundGlobalBuildDiscarder.class.getName());
+
+    public BackgroundGlobalBuildDiscarder() {
+        super("Periodic background build discarder"); // TODO i18n


Is the TODO required for merge?

I don't think so. I'm not sure we're even localizing these.

timja · 2019-12-20T14:05:37Z

Should we really limit each descriptor to one occurrence?

Would be good to allow multiple so that I.e a regex based extension could have different rules for master branch and other branches / prs

daniel-beck · 2019-12-20T22:47:30Z

Would be good to allow multiple so that I.e a regex based extension could have different rules for master branch and other branches / prs

This is still possible, just requires more complex individual discarders (as they'd need to support N patterns/rules instead of 1).

Forgot to mention a downside: Especially the default (unconfigurable) jobBuildDiscarder could be added multiple times, possibly leading to user confusion; it seems to me it also potentially be more difficult to write build discarders that have rules that depend on a larger context (e.g. builds across jobs).

timja · 2019-12-20T23:15:59Z

hmm I guess that would be fine

daniel-beck · 2020-01-08T23:55:06Z

hmm I guess that would be fine

Could you clarify which behavior is preferable in your opinion?

timja · 2020-01-09T04:44:55Z

More complex individual discarders is fine,
so that you don’t get multiples of discarders that shouldn’t be added multiple times

jvz

Looks good overall. Would certainly like to see this feature in production where disk space errors like to hang out.

jvz · 2020-01-09T22:33:35Z

core/src/main/java/jenkins/model/GlobalBuildDiscarderStrategy.java

+            try {
+                apply(run);
+            } catch (IOException|InterruptedException ex) {
+                // TODO should these actually be caught, or just thrown up to stop applying?


I was about to leave a comment about this and noticed that I already did.

jvz · 2020-01-09T22:34:56Z

core/src/main/resources/jenkins/model/GlobalBuildDiscarderConfiguration/config.groovy

+
+f = namespace(lib.FormTagLib)
+
+f.section(title: _("Global Build Discarders")) {


Nit: does this view really need to be Groovy? Seems fairly trivial to convert to Jelly.

timja · 2020-01-28T16:30:15Z

@daniel-beck are the questions in the PR description still open / needing feedback?

Open Questions (feedback welcome):

Should the "Job" Global Build Discarder be implemented differently, without a UI option? If we actually consider it to be a bug fix (see above and below), why would there be a UI that boils down to "[x] fix the bug"?
Should we really limit each descriptor to one occurrence? This should make it more difficult to implement more flexible strategies, e.g. the proposed "regex match" one would need its own list of (regex/build discarder) pairs, rather than just one of each as a property, and then have N instances of the extension in the top level list…

There's 4 approvals on this, just checking if everything is in order to move forward on it

daniel-beck · 2020-01-28T18:04:42Z

@timja

are the questions in the PR description still open / needing feedback?

I have received no responses to the first question. I'm fairly OK with the way it works, just flagging it for attention if someone cares. It doesn't look like it so far.

I have only received one response to the second question (from you), and it was approving of the current implementation after a short conversation. FWIW this can always be opened up further, but restricting would be difficult.

There's one unaddressed feedback of the code catching an InterruptedException when it shouldn't, but have held off addressing that until I got more feedback to limit iteration count. It doesn't look like that will be forthcoming, so perhaps it's time to address that so this can be merged.

timja · 2020-02-08T08:40:05Z

There appears to be no outstanding issues and 4 approvals, looks like it's time to get this in.

After a 24 hour timeout for last minute feedback, this can be merged.

Add extensible background build discarders

de2bf19

Default implementation: Run per-job configured discarder periodically

awittha reviewed Nov 22, 2019

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core/src/main/java/jenkins/model/GlobalBuildDiscarderStrategy.java Outdated Show resolved Hide resolved

res0nance reviewed Nov 22, 2019

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Prevent use of the specific strategy from plugins

6795cd7

timja mentioned this pull request Nov 28, 2019

Added real Log Rotation for jobs #4336

Closed

4 tasks

Apply global discarders after build finalization, i18n, etc.

326ca35

daniel-beck removed the needs-testcase Test automation is required for this pull request label Dec 8, 2019

timja reviewed Dec 8, 2019

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core/src/main/java/jenkins/model/GlobalBuildDiscarderConfiguration.java Outdated Show resolved Hide resolved

daniel-beck commented Dec 9, 2019

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timja requested a review from fcojfernandez December 16, 2019 00:05

res0nance reviewed Dec 16, 2019

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res0nance approved these changes Dec 16, 2019

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daniel-beck requested a review from a team December 16, 2019 09:59

jvz reviewed Dec 16, 2019

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jvz self-requested a review December 16, 2019 19:50

awittha reviewed Dec 16, 2019

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oleg-nenashev self-requested a review December 21, 2019 01:16

timja requested a review from a team January 7, 2020 08:24

timja added the needs-more-reviews Complex change, which would benefit from more eyes label Jan 7, 2020

awittha approved these changes Jan 8, 2020

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jvz approved these changes Jan 9, 2020

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Do not catch InterruptedException

9ffeeff

timja added ready-for-merge The PR is ready to go, and it will be merged soon if there is no negative feedback and removed needs-more-reviews Complex change, which would benefit from more eyes labels Feb 8, 2020

daniel-beck added the squash-merge-me Unclean or useless commit history, should be merged only with squash-merge label Feb 11, 2020

timja merged commit 5c9ba14 into jenkinsci:master Feb 14, 2020

jglick mentioned this pull request Jul 16, 2020

Flakes in NetworkTest.errorCleaningArtifacts due to BackgroundGlobalBuildDiscarder jenkinsci/artifact-manager-s3-plugin#143

Merged

	if (f.isFile()) {
	if ((lastRotateMillis + logRotateMillis < System.currentTimeMillis())
	\|\| (logRotateSize > 0 && f.length() > logRotateSize)) {
	lastRotateMillis = System.currentTimeMillis();
	File prev = null;
	for (int i = 5; i >= 0; i--) {
	File curr = i == 0 ? f : new File(f.getParentFile(), f.getName() + "." + i);
	if (curr.isFile()) {
	if (prev != null && !prev.exists()) {
	if (!curr.renameTo(prev)) {
	logger.log(getErrorLoggingLevel(), "Could not rotate log files {0} to {1}",
	new Object[]{curr, prev});
	}
	} else {
	if (!curr.delete()) {
	logger.log(getErrorLoggingLevel(), "Could not delete log file {0} to enable rotation",
	curr);
	}
	}
	}
	prev = curr;
	}
	}

		@@ -0,0 +1,3 @@
		blurb = Build discarders configured for a job are only run after a build finishes. \
		This option runs jobs'' configured build discarders periodically, applying configuration changes even when no new builds are run. \


		f = namespace(lib.FormTagLib)

		f.section(title: _("Global Build Discarders")) {

Add extensible background build discarders #4368

Add extensible background build discarders #4368

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daniel-beck commented Nov 22, 2019 • edited by MarkEWaite Loading

Proposed changelog entries

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timja commented Dec 20, 2019

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timja commented Jan 28, 2020

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