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https://issues.apache.org/jira/browse/NIFI-5702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16943636#comment-16943636
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Peter Wicks commented on NIFI-5702:
-----------------------------------
We just had this issue happen in our cluster. When we discussed this same
problem internally, we had come up with having a setting that would not let
NiFi start without a flow.xml. Either the flow has to exist locally, or it must
be provided by the cluster. Feels like a similar solution, though different in
the details.
> FlowFileRepo should not discard data (at least not by default)
> --------------------------------------------------------------
>
> Key: NIFI-5702
> URL: https://issues.apache.org/jira/browse/NIFI-5702
> Project: Apache NiFi
> Issue Type: Improvement
> Reporter: Brandon Rhys DeVries
> Priority: Major
>
> The WriteAheadFlowFileRepository currently discards data it cannot find a
> queue for. Unfortunately, we have run in to issues where, when rejoining a
> node to a cluster, the flow.xml.gz can go "missing". This results in the
> instance creating a new, empty, flow.xml.gz and then continuing on... and not
> finding queues for any of its existing data, dropping it all. Regardless of
> the circumstances leading to an empty (or unexpectedly modified) flow.xml.gz,
> dropping data without user input seems less than ideal.
> Internally, my group has added a property
> "....remove.orphaned.flowfiles.on.startup", defaulting to "false". On
> startup, rather than silently dropping data, the repo will throw an exception
> preventing startup. The operator can then choose to either "fix" any
> unexpected issues with the flow.xml.gz, or they can set the above property to
> "true" which restores the original behavior allowing the system to be
> restarted. When set to "true" this property also results in a warning
> message indicating that in this configuration the repo can drop data without
> (advance) warning.
>
>
> [1]
> https://github.com/apache/nifi/blob/support/nifi-1.7.x/nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-framework-core/src/main/java/org/apache/nifi/controller/repository/WriteAheadFlowFileRepository.java#L596
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