First of all, thank you for your return @MattWho . I think the reason is distributedMapCacheServer as you said.Because I use distributedMapCacheServer in my stream. As far as I know, you need to define distributedMapCacheServer to use the distributedMapCacheService.When I look at the features of the two controller services, there are one parameter that catch my eye.DetectDuplicate processors parameters as I shared in the image. If the Age Off Duration parameter is set to 30 minutes, doesn't it delete the data stored in the distributedMapCacheService after 30 minutes?If not, is there a way to clean-up the distributedMapCacheService?   ... View more

Thank you very much for your answer 🙂 I tried it and found it worked. ... View more

Yes that's true. I want to add the flowFiles content from the stream to the file line by line.For example two flowFiles came from the stream.The content of the first flowFile is content1.The content of the second flowFile is content2.As a result, when the flow is completed, I want the following two lines to be in the file on the server: content1 content2 ... View more

I do not want to change the content of the file, I want to print a new value over the existing value. ... View more