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https://issues.apache.org/jira/browse/AMQ-4212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13556387#comment-13556387
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Torsten Mielke commented on AMQ-4212:
-------------------------------------
@Tim, don't have a unit test yet but presumably can create one. It will have to
wait until February though as I am currently on vacation.
> Broker may be unable to recover durable topic subscription from the kahadb
> journal
> ----------------------------------------------------------------------------------
>
> Key: AMQ-4212
> URL: https://issues.apache.org/jira/browse/AMQ-4212
> Project: ActiveMQ
> Issue Type: Bug
> Components: Message Store
> Affects Versions: 5.7.0
> Environment: kahadb and durable topic subscribers
> Reporter: Torsten Mielke
>
> KahaDB is supposed to recover its index from the journal *completely*.
> Such recovery can be enforced by stopping the broker, deleting the db.data
> index file and restarting the broker.
> The recovery process may however not be able to recover inactive durable
> topic subscriptions.
> This is because the kahadb cleanup task will not consider any active
> subscription entries in the journal files when marking journal files for
> deletion.
> E.g. If a durable sub info was written to e.g. the journal file db-1.log but
> kahadb has already rolled over to writing to db-2.log, the cleanup task may
> delete db1.log (in case all msgs in db1.log got acked). The durable sub
> however is still alive.
> When stopping the broker this durable sub info is still present in the index
> file and will be restored at broker restart.
> If however the index file gets deleted in order to enforce a recovery of the
> index from the journal, then the broker has lost the information about this
> durable sub.
> The broker is therefore not able to recover its state fully from the journal
> files.
> If the durable subscriber remains inactive (i.e. does not reconnect to broker
> immediately after broker restart), it may miss messages as the broker has no
> knowledge of this durable sub.
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