In CouchDB and Cloudant, when documents are changed, the database holds on to previous versions. What gets kept, and for how long?
How many document revisions are kept in CouchDB / Cloudant, and for how long?
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Cloudant and CouchDB keep the document's metadata forever (id, rev, deleted and conflict). Document contents are deleted during compaction (automatic in Cloudant, manual in CouchDB), with one exception: in the case of a conflict, we'll keep the document contents until the conflict is resolved.
For each document, we keep the last X revisions, where X is the number returned by
{username}.cloudant.com/{db}/_revs_limit, defaulting to 1000. Revisions older than the last 1000 get dropped. You can change_revs_limitby making a PUT request with a new value to that endpoint. For example:So, if a document is replicated to two nodes, edited 1001 times on node A, and then replicated again to node B, it will generate a conflict on node B (because we've lost the information necessary to join the old and new edit paths together).