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https://issues.apache.org/jira/browse/CAMEL-4575?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13133592#comment-13133592
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Claus Ibsen commented on CAMEL-4575:
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There is some logic in DefaultExchangeHolder to serialize/unserialize a Camel
Exchange. We use that in the persistent aggregator. So we should use that logic
here as well.
Long term the trick would be to survice server crashes, and support recovery
when Camel comes back online, as the persistent store needs to keep state if
the exchange has been redelivered or not. And how many redelivery attempts has
already been made.
The aggregator supports this.
This logic should IMHO not be implemented in a patch release, and thus only
applicable for 2.9.0
> Persistant Dead Letter Channel to avoid memory consumption between retries
> --------------------------------------------------------------------------
>
> Key: CAMEL-4575
> URL: https://issues.apache.org/jira/browse/CAMEL-4575
> Project: Camel
> Issue Type: New Feature
> Components: camel-core
> Reporter: Jean-Baptiste Onofré
> Fix For: 2.8.3, 2.9.0
>
>
> When using a DeadLetterChannel, the messages are stored in memory between the
> retries (redeliveries). They are flushed from the memory only when we get the
> maximumRedeliveries value.
> It means that we can have an important memory consumption, because the
> messages are memory resident for a long time when:
> - if we have an important maximumRedeliveries, especially if we have -1
> - if we have an important redeliveryDelay
> I propose to create a PersistentDeadLetterChannel, working like the
> DeadLetterChannel, but, between redeliveries, the messages are flushed to a
> persistent store (filesystem, JMQ queue, JDBC, ...).
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