[GitHub] nifi issue #563: NIFI-2078: External state management.

[ijokarumawak <gi...@git.apache.org>]

Github user ijokarumawak commented on the issue:

    https://github.com/apache/nifi/pull/563
  
    @JPercivall @olegz Thanks for reviewing this! I've rebased the branch, and addressed the feedback. However, while I was testing this again, I noticed that if it's running on a clustered NiFi environment, every node gets and clears offsets from Kafka. While it's working, I think these method should be executed on only the primary node, or if it's a standalone instance since offsets information is a global state among consumers.
    
    With `@OnPrimaryNodeStateChange` annotation, it's possible to know if it's a cluster and a primary node. But it's only called if a node get elected as a primary, or a node was primary but revoked. Since other node is not notified, I couldn't distinguish standalone or primary from a processor..
    So, I left it as it is for now. Do you know If there's a way to know if NiFi is clustered from a processor?


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