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https://issues.apache.org/jira/browse/SLING-13262?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joerg Hoh reassigned SLING-13262:
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Assignee: Joerg Hoh
> BundledScriptTracker.refreshDispatcher() is not thread-safe
> -----------------------------------------------------------
>
> Key: SLING-13262
> URL: https://issues.apache.org/jira/browse/SLING-13262
> Project: Sling
> Issue Type: Improvement
> Components: Servlets
> Affects Versions: Servlets Resolver 3.0.6
> Reporter: Joerg Hoh
> Assignee: Joerg Hoh
> Priority: Major
>
> h3. Summary
> BundledScriptTracker.refreshDispatcher() performs a non-atomic
> read-modify-write on the shared dispatchers map and mutates the
> currently-published map in place. When two bundles carrying
> sling.resourceType capabilities are installed and/or uninstalled at (nearly)
> the same time, the two refreshDispatcher() invocations interleave and leave
> the DispatcherServlet registrations in an inconsistent state.
> h3. Symptom
> After concurrent bundle lifecycle events involving bundled scripts, one or
> more of the following is observed:
> * Bundled scripts stop resolving. A resource type provided by a freshly
> installed bundle is not served by its script — requests fall through to the
> default servlet or a less-specific script, producing wrong output or 404/500
> responses. The scripts are physically present in the bundle but the resolver
> has no DispatcherServlet registered for their resource type.
> * IllegalStateException: Service already unregistered logged from
> ServiceRegistration.unregister(), thrown out of the bundle-tracker callback.
> * Stale dispatchers remain registered. A resource type from an uninstalled
> bundle keeps being served by a leftover DispatcherServlet, so an old/removed
> script continues to execute.
> * The symptoms are intermittent and load/timing dependent: they appear during
> startup (many bundles activating in parallel) or during a coordinated
> deployment (several content/script bundles installed or refreshed together),
> and typically cannot be reproduced by installing the bundles one at a time.
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