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https://issues.apache.org/jira/browse/CAMEL-17544?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen resolved CAMEL-17544.
---------------------------------
Fix Version/s: 4.0.0
3.21.0
Resolution: Fixed
> ServicePool.doStop still hangs during shutdown
> ----------------------------------------------
>
> Key: CAMEL-17544
> URL: https://issues.apache.org/jira/browse/CAMEL-17544
> Project: Camel
> Issue Type: Bug
> Components: came-core
> Affects Versions: 3.14.0, 3.18.0
> Reporter: Krzysztof Jamróz
> Assignee: Rhuan Rocha
> Priority: Major
> Fix For: 4.0.0, 3.21.0
>
> Attachments: ServicePoolShutdownTest.java
>
>
> {{ServicePool.doStop}} still hangs during shutdown with optimized fix of
> CAMEL-17536. {{LinkedHashMap}} in cache is corrupted not only because of race
> condtion between {{acquire}} and {{doStop}} but also between concurrent
> invocations of {{acquire}} during parallel routing of exchanges (see attached
> {{{}repeatTestRecipientList{}}}).
>
> The root cause is that {{LinkedHashMap}} used by {{SimpleLRUCache}} is *not*
> thread-safe but access is not synchronized. Even reads may modify it as it
> has LRU policy. And access to {{{}LinkedHashMap{}}}/\{{ SimpleLRUCache }} is
> possible during routing (so concurrently) not only during start/stop.
>
> Uses of {{SimpleLRUCache}} in other places in Camel may also exhibit race
> conditions. It is hard to demonstrate them reliably but I have another
> example ({{{}repeatEndpointsTest{}}}). This one usually crashes due to
> {{OutOfMemory}} when converting corrupted (looping) {{SimpleLRUCache}} in
> {{EndpointRegistry}} to array, but I got also other exceptions.
>
> {noformat}
> java.lang.OutOfMemoryError: Java heap space
> at java.base/java.util.Arrays.copyOf(Arrays.java:3480)
> at
> java.base/java.util.AbstractCollection.finishToArray(AbstractCollection.java:227)
> at
> java.base/java.util.AbstractCollection.toArray(AbstractCollection.java:148)
> at java.base/java.util.ArrayList.<init>(ArrayList.java:181)
> at
> org.apache.camel.impl.engine.AbstractCamelContext.shutdownServices(AbstractCamelContext.java:3582)
> at
> org.apache.camel.impl.engine.AbstractCamelContext.shutdownServices(AbstractCamelContext.java:3576)
> at
> org.apache.camel.impl.engine.AbstractCamelContext.doStop(AbstractCamelContext.java:3414)
> at org.apache.camel.support.service.BaseService.stop(BaseService.java:160)
> at
> org.apache.camel.impl.engine.AbstractCamelContext.stop(AbstractCamelContext.java:2658)
> at
> org.apache.camel.component.http.ServicePoolShutdownTest.testEndpoints(ServicePoolShutdownTest.java:129)
> at
> org.apache.camel.component.http.ServicePoolShutdownTest.repeatEndpointsTest(ServicePoolShutdownTest.java:135){noformat}
>
> Caffeine, which used to be default cache implementation until CAMEL-16093 is
> thread-safe. Enabling caffeine-lrucache might be a workaround.
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