question Re: Using Apache Nifi How can you perform a mathematical operation on json attribute in Support Questions

question Re: Using Apache Nifi How can you perform a mathematical operation on json attribute in Support Questions https://community.cloudera.com/t5/Support-Questions/Using-Apache-Nifi-How-can-you-perform-a-mathematical/m-p/285290#M211736 <a href="https://community.cloudera.com/t5/user/viewprofilepage/user-id/45715">@fowler7878</a>  Writing to the content will overwrite all the other content which is not what I think you want to be doing.  Plus the updateAttribute processor can only manipulate FlowFile attributes via the NiFi Expression Language (EL). So you need to extract the json value to a FlowFile attribute in the EvaluateJsonPath processor.  Then manipulate that attributes value and then use UpdateRecord to update the actual content of your FlowFile using that FlowFile's attribute. Matt Tue, 10 Dec 2019 19:21:15 GMT MattWho 2019-12-10T19:21:15Z