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https://issues.apache.org/jira/browse/NIFI-3594?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15991523#comment-15991523
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ASF GitHub Bot commented on NIFI-3594:
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Github user alopresto commented on the issue:
https://github.com/apache/nifi/pull/1686
Yolanda,
I can reproduce your described issue. I believe the difference is that when
I tested and did not clear the existing provenance repository, I was switching
between `EncryptedWriteAheadProvenanceRepository` and
`WriteAheadProvenanceRepository` which both use a `SchemaRecordReader` that can
be cross-cast (`EncryptedRecordSchemaReader` extends
`EventIdFirstRecordSchemaReader`), so the class cast exception wasn't
occurring. However, if you test by first using
`PersistentProvenanceRepository`, this uses `ByteArraySchemaRecordReader`,
which implements the same `RecordReader` interface but cannot be cast. As
`PersistentProvenanceRepository` is the existing option that most people will
be using, production switch over will encounter this issue. I will try to
improve this user experience (opening a separate sub-task to do that). For now,
I've included documentation in [NIFI-3721] stating that the existing repository
should be erased when switching (as this is a new feature and
backward-compatibility is not yet provided).
> Implement encrypted provenance repository
> -----------------------------------------
>
> Key: NIFI-3594
> URL: https://issues.apache.org/jira/browse/NIFI-3594
> Project: Apache NiFi
> Issue Type: Sub-task
> Components: Core Framework
> Affects Versions: 1.1.1
> Reporter: Andy LoPresto
> Assignee: Andy LoPresto
> Labels: encryption, provenance, repository
>
> I am going to start with the provenance repository, as the new implementation
> of {{WriteAheadProvenanceRepository}} has the most recent design decisions
> and has not been available in a released version yet, so there should be
> minimal backward compatibility concerns.
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