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https://issues.apache.org/activemq/browse/AMQ-3001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=62864#action_62864
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Gary Tully commented on AMQ-3001:
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When a durable is forwarded through a network a well known durable subscriber
needs to be created that can out live the original, so if there is a partition,
there will be no loss of messages for the networked durable.
They use the prefix,NC-DS, (network connector durable sub) prefix comprised of
the the local broker and destination physical name, see
org.apache.activemq.network.DurableConduitBridge#getSubscriberName
The expectation is that the connection associated with the durable sub will
change when the same durable again subscribes, the point being that the nc-ds
can outlive the new connection.
The dynamicOnly property of a network connector can controll whether the nc-ds
is activated on startup, when true, the NC-DS will only be activated when the
original durable sub again (dynamically) reconnects. With dynamicOnly=true, it
is possible to miss messages when disconnected, so it defaults to false.
The NC-DS-xx will only be deleted when the original durable sub unsubscribes.
> Ghost durable topic subscribers
> -------------------------------
>
> Key: AMQ-3001
> URL: https://issues.apache.org/activemq/browse/AMQ-3001
> Project: ActiveMQ
> Issue Type: Bug
> Affects Versions: 5.4.1
> Environment: Ubuntu 9.10
> Reporter: James Green
> Priority: Minor
>
> Listed on the Durable Topic Subscribers within the web interface I now have:
> Client ID: NC_ubuntu_inbound_blofeld
> Subscription Name: NC-DS_blofeld_Account.Requests
> Connection ID: ID:blofeld-37576-1288168498890-3:1
> I did have a subscription however it lacked a Client-ID, so it disconnected
> and I restarted ActiveMQ. The result is shown above. There are allegedly no
> such connections listed on the Connections page.
> No idea what NC or NC-DS mean! This is confusing at best.
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