Using DAta Flow Provenance Tools
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Older Existing NiFi Version

If you are upgrading from an older version of NiFi to 1.2.0 or later, it is recommended that you do not change the provenance configuration to Write Ahead until you confirm your flows and environment are stable in 1.2.0 first. This reduces the number of variables in your upgrade and can simplify the debugging process if any issues arise.