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Luzifer / clean_couch
This utility emerged from the need to delete about 20k documents from a CouchDB database with more than 600k documents. As I did not want to delete every document by hand and had no other way to delete documents by a specific filter I wrote this to fetch documents from a view which filters my documents for me and then deletes them efficiently by using Go routines.
Usage
- Create a view which filters the documents in your database with exactly this emit line you can see in this example
function(doc) {
if (doc.user == "usertodelete") {
emit(doc._rev, null);
}
}
- Execute with parameters
# ./clean_couch
Usage of ./clean_couch:
--baseurl="http://localhost:5984": BaseURL of your CouchDB instance
--concurrency=20: How many delete requests should get processed concurrently?
--database="": The database containing your view and the data to delete
--view="": The view selecting the data to delete
# ./clean_couch --baseurl=https://user:pass@mycouch.db --database=userdata --view=_design/del/_view/usertodelete
Warnings
- If you set the concurrency above 1024 either
clean_couch
or even the CouchDB server might break because of a limit in open file descriptors - If the database has many views you could overload your server because views need to get recalculated
(My CouchDB server survived a concurrency of 100 with minimal load) - This tool will not place nice with your CouchDB if you configure it wrong
- Tripple-check your View does only contain what you want to delete and you used the right view. This tool does not come with a safety-net!