I'm trying to traverse through a large CSV file. Each line, I do some data remodelling and convert it to XML format. Lastly, I save all of it into an XML file. In my actual implementation, the resulting remodelled XML data is 10x larger than the source CSV data. I have a use case where the sourc…

So I tried appending the XML data per iteration and delete the msg.payload before feeding the message to the Join node so it doesn't accumulate data. If you want to iterate, you need to use output msg per line in the file-in node. Still going to be heavy impact. I don't think node-red is the ri…

Yes. Using msg per line on the input should allow this to work. You shouldn’t need the join hopefully ax you can also output a line at a time as well. I have been processing video files extracting metadata no problem.

[image] bakman2: I don't think node-red is the right tool to perform these action on such a large csv, a csv that size should belong in a database where you can do all kinds of operations on the data and iterate more efficiently (if the data is indexed) Yes, I agree with that. But for some r…

When you use the file in node in per line mode it add a msg.parts property that includes the number of the line - and when complete, the total number of lines - so you could possibly use those a) to trigger adding the header - and then b) adding the tailer.

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Memory issues processing and writing a large file

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Memory issue processing large csv file General	3	776	20 December 2021
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Memory issues processing and writing a large file

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