CODEWITHSUNDEEP
node.js
samol
samol

Reputation: 20590

NodeJS: Does fs.appendFile keeps a link to the file open so appends are faster?

http://nodejs.org/api/fs.html#fs_fs_appendfile_filename_data_options_callback

Does fs.appendFile keeps a link to the file open so appends are faster? (rather than open/close each write)

What is the fastest way to write to a CSV file. I have using appendfile to write new lines to a CSV file. Would a write stream be faster? (if appendfile opens the file each time)

Note: I am actually writing about 20GB of CSV

Follow up: I can confirm that createWriteStream is much faster than appendFile

Upvotes: 6

Views: 2726

Answers (2)

alex
alex

Reputation: 12265

fs.appendFile is a convenience function.

If performance is important to you, you should use fs.createWriteStream instead.

Upvotes: 4

ZachRabbit
ZachRabbit

Reputation: 5174

It looks like fs.appendFile closes the file when it's finished writing each chunk.

https://github.com/joyent/node/blob/master/lib/fs.js#L907

So a stream is probably going to be faster. However, it will probably only make a difference if you're writing a significant number of CSV files.

Upvotes: 5

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