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https://issues.apache.org/jira/browse/NIFI-2835?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Handermann resolved NIFI-2835.
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Assignee: David Handermann (was: Eric Ulicny)
Resolution: Won't Fix
As described in the comments, ConsumeAzureEventHub is the preferred approach
for processing records from Azure Event Hubs. It does require Azure Storage for
checkpointing, so the best solution would be to update ConsumeAzureEventHub to
support alternative checkpoint locations. More recent updates to the Azure
Event Hub libraries should make it easier to implement the Checkpoint Storage
interfaces.
> GetAzureEventHub processor should leverage partition offset to better handle
> restarts
> -------------------------------------------------------------------------------------
>
> Key: NIFI-2835
> URL: https://issues.apache.org/jira/browse/NIFI-2835
> Project: Apache NiFi
> Issue Type: Improvement
> Reporter: Joe Percivall
> Assignee: David Handermann
> Priority: Major
>
> The GetAzureEventHub processor utilizes the Azure client that consists of
> receivers for each partition. The processor stores them in a map[1] that gets
> cleared every time the processor is stopped[2]. These receivers have
> partition offsets which keep track of which message it's currently on and
> which it should receive next. So currently, when the processor is
> stopped/restarted, any tracking of which message is next to be received is
> lost.
> If instead of clearing the map each time, we hold onto the receivers, or kept
> track of the partitionId/Offsets when stopping, (barring any relevant
> configuration changes) the processor would restart exactly where it left off
> with no loss of data.
> This would work very well with NIFI-2826.
> [1]https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-azure-bundle/nifi-azure-processors/src/main/java/org/apache/nifi/processors/azure/eventhub/GetAzureEventHub.java#L122
> [2]
> https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-azure-bundle/nifi-azure-processors/src/main/java/org/apache/nifi/processors/azure/eventhub/GetAzureEventHub.java#L229
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