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https://issues.jenkins-ci.org/browse/JENKINS-12763?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on JENKINS-12763 started by David Santiago.
> Excessive lock contention when using mercurial cache with multiple repos and
> slaves
> -----------------------------------------------------------------------------------
>
> Key: JENKINS-12763
> URL: https://issues.jenkins-ci.org/browse/JENKINS-12763
> Project: Jenkins
> Issue Type: Improvement
> Components: mercurial
> Affects Versions: current
> Reporter: David Santiago
> Assignee: David Santiago
> Labels: lock, mercurial, threads
>
> The current implementation of the mercurial plugin uses a too aggressive
> locking approach for managing its cache across master and build slaves.
> By aggressive I mean that whenever a build starts for a given repository on
> any given build slave, it will block any subsequent build of any other jobs
> which share the same repository while it updates the cache in both the master
> and the slave used for the build, and also creates its working directory.
> With multiple jobs which share repositories (through different branches, for
> instance), lock contention ramps up.
> This is not necessary, as a different locking mechanism can be used to allow
> concurrent builds of jobs which share the same repository but run in
> different slaves. It can be achieved by using different locks for controlling
> the updates of master and slave nodes caches.
> This way, we reduce lock contention and increase cache update performance.
> A pull request has been created for this:
> https://github.com/jenkinsci/mercurial-plugin/pull/21
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