[jira] [Updated] (CAMEL-13504) Strange behaviour of SimpleLRUCache with ProducerTemplate

["Claus Ibsen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CAMEL-13504?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Claus Ibsen updated CAMEL-13504:
--------------------------------
    Fix Version/s:     (was: 3.0.0)
                   Future

> Strange behaviour of SimpleLRUCache with ProducerTemplate
> ---------------------------------------------------------
>
>                 Key: CAMEL-13504
>                 URL: https://issues.apache.org/jira/browse/CAMEL-13504
>             Project: Camel
>          Issue Type: Bug
>          Components: came-core
>    Affects Versions: 3.0.0
>            Reporter: James Netherton
>            Priority: Minor
>             Fix For: Future
>
>
> If no cache factory implementation can be found on the classpath then Camel falls back on {{SimpleLRUCache}}.
> This has some strange effects when using {{ProducerTemplate.send()}} (or {{.request()}}). I didn't dig too much into the problem, but it's something to do with what happens when a producer is evicted from the producer cache. It causes the producer {{doStop()}} method to be called. So if an endpoint is trying to connect to some external resource, it ends up closing that connection prior to any message being sent.
> To see this, add a dependency exclusion for {{camel-caffeine-lrucache}} in the {{camel-elasticsearch-rest}} {{pom.xml}}, then run a test:
> {code:java}
> mvn clean test -Dtest=ElasticsearchIndexTest#testIndex
> {code}
> In the console output you'll see something like the following. Note the multiple connect / disconnect from {{ElasticsearchProducer}}:
> {code:java}
> [2019-05-13T08:03:30,574][INFO ][o.a.c.c.e.ElasticsearchProducer] [unknown] Connecting to the ElasticSearch cluster: elasticsearch
> [2019-05-13T08:03:30,575][INFO ][o.a.c.c.e.ElasticsearchProducer] [unknown] Disconnecting from ElasticSearch cluster: elasticsearch
> [2019-05-13T08:03:30,578][INFO ][o.a.c.c.e.ElasticsearchProducer] [unknown] Connecting to the ElasticSearch cluster: elasticsearch
> [2019-05-13T08:03:30,579][INFO ][o.a.c.c.e.ElasticsearchProducer] [unknown] Disconnecting from ElasticSearch cluster: elasticsearch
> [2019-05-13T08:03:30,582][INFO ][o.a.c.c.e.ElasticsearchProducer] [unknown] Connecting to the ElasticSearch cluster: elasticsearch
> [2019-05-13T08:03:30,582][INFO ][o.a.c.c.e.ElasticsearchProducer] [unknown] Disconnecting from ElasticSearch cluster: elasticsearch
> [2019-05-13T08:03:30,586][INFO ][o.a.c.c.e.ElasticsearchProducer] [unknown] Connecting to the ElasticSearch cluster: elasticsearch
> [2019-05-13T08:03:30,587][INFO ][o.a.c.c.e.ElasticsearchProducer] [unknown] Disconnecting from ElasticSearch cluster: elasticsearch
> [2019-05-13T08:03:30,590][INFO ][o.a.c.i.DefaultCamelContext] [unknown] Route: route9 started and consuming from: direct://start
> [2019-05-13T08:03:30,591][INFO ][o.a.c.i.DefaultCamelContext] [unknown] Route: route10 started and consuming from: direct://index
> [2019-05-13T08:03:30,591][INFO ][o.a.c.i.DefaultCamelContext] [unknown] Route: route11 started and consuming from: direct://deleteIndex
> [2019-05-13T08:03:30,592][INFO ][o.a.c.i.DefaultCamelContext] [unknown] Route: route12 started and consuming from: direct://indexWithReplication
> [2019-05-13T08:03:30,592][INFO ][o.a.c.i.DefaultCamelContext] [unknown] Total 4 routes, of which 4 are started
> [2019-05-13T08:03:30,592][INFO ][o.a.c.i.DefaultCamelContext] [unknown] Apache Camel 3.0.0-SNAPSHOT (CamelContext: camel-3) started in 0.040 seconds
> {code}
> When the test case comes to send a message via {{ProducerTemplate}}, it fails because there is no active connection to the test ElasticSearch cluster.
> {code:java}
> java.lang.IllegalStateException: Request cannot be executed; I/O reactor status: STOPPED
> {code}



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