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https://issues.apache.org/jira/browse/CAMEL-11223?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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TEIKITEETINI-VAYSSE Loic updated CAMEL-11223:
---------------------------------------------
Summary: camel-jpa doesn't handle exclusive locks for concurrent consumers
when setting consumeDelete to false (was: camel-jpa doesn't handle exclusive
locks for concurrent consumers)
> camel-jpa doesn't handle exclusive locks for concurrent consumers when
> setting consumeDelete to false
> -----------------------------------------------------------------------------------------------------
>
> Key: CAMEL-11223
> URL: https://issues.apache.org/jira/browse/CAMEL-11223
> Project: Camel
> Issue Type: Improvement
> Components: camel-jpa
> Affects Versions: 2.18.3
> Environment: Java JDK 1.8.0_121
> Spring 4 (reproduced with Spring Boot 1.5.3)
> RedHat RHEL 7.1 x86_64
> Oracle 11G
> Reporter: TEIKITEETINI-VAYSSE Loic
>
> Deploying 4 instances of the same app containing a camel-jpa consumer polling
> on the same database, I noticed that several servers can consume the same
> entities.
> The polling is currently done as follow :
> # Poll without lock on the `maxResult` first rows
> # On each row :
> ## Apply a lock _select ... for update (NOWAIT)_
> ## Consume entity
> ## Release the lock (commit)
> What can happen with several instances of the consuming on the same database
> is :
> # {color:green}Server 1 polls the 10 first rows{color}
> # {color:red}Server 2 polls the same 10 first rows{color}
> # {color:green}Server 1 locks row 1 for update and consume it{color}
> # {color:red}Server 2 locks row 1 for update as the previous lock is already
> released and consumes it{color}
> One fix could be to add a _@IsConsumed_ annotation defining a method to check
> whether or not the entity has already been consumed. This method would be
> called at the beginning of the _batchProcess_. That is the work around we
> applied on our project but directly in our route ie without modifying the
> component.
> This demand is related to my previous post on the user forum :
> http://camel.465427.n5.nabble.com/JPA-consumer-component-is-not-handling-multiple-server-concurrent-polling-td5797937.html
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