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CouchDB's _changes feed provides a persistent, sequence‑ordered log for incremental sync. This blog covers feed semantics, filtered replication, a ready‑to‑run polling script, and the trade‑offs (conflicts, compaction, connection limits) you'll encounter in production.
Learn how CouchDB’s _changes HTTP feed provides a low‑overhead, long‑polling stream of document revisions that lets multiple clients react instantly to updates, plus how to manage connection costs.
CouchDB 3.2.0 replaces the fixed 30‑second HTTP request limit with a configurable httpd.timeout integer in the httpd section of local.ini or default.ini. This timeout governs how long the server waits before returning HTTP 408 and aborting the connection. The same interval also governs _changes long‑poll feeds: if no change notification occurs within the con
The goal is to ensure that when a client cancels a request—by closing the TCP connection or exceeding a timeout—any server‑side work such as ongoing map‑reduce index updates or _changes feed processing is halted promptly to avoid wasting CPU and I/O resources. CouchDB currently stops transmitting _changes events after detecting a closed socket, but ongoing v
couchdb
nodejs