Kyle Weaver created BEAM-14225:
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Summary: load balance jenkins jobs
Key: BEAM-14225
URL: https://issues.apache.org/jira/browse/BEAM-14225
Project: Beam
Issue Type: Improvement
Components: testing
Reporter: Kyle Weaver
Jenkins can do automatic load balancing for cron jobs that use the "H" syntax
[1], but we apply it only sporadically (and often incorrectly) in Beam. For
example, the default setting used by all precommit cron jobs and others is
currently '0 */6 * * *' [2]. This means "every six hours, starting from exactly
00:00 (UTC)." Which creates load spikes every 6 hours, since all the precommits
are run at once, rather than being staggered.
[1]
https://github.com/jenkinsci/jenkins/blob/master/core/src/main/resources/hudson/triggers/TimerTrigger/help-spec.jelly#L40-L41
[2]
https://github.com/apache/beam/blob/4dddaf9c3d70b5b858c16265abee4cdbf0c72631/.test-infra/jenkins/CronJobBuilder.groovy#L40
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