bravier commented on issue #1418: BUG: Recreating deleted document can break replication when VDU function is active URL: https://github.com/apache/couchdb/issues/1418#issuecomment-430149024 Hello, We are facing a similar issue as the one described by @ondra-novak on the `_users` database. ## Steps to reproduce Let `A` and `B` be 2 CouchDB servers. - Create the `_users` database _(if it does not exist yet)_ _Request_ ```shell curl -X PUT http://$A:5984/_users ``` _Response_ ```json { "ok": true } ``` - Create a user document _Request_ ```shell curl -X PUT http://$A:5984/_users/org.couchdb.user:[email protected] -d '{"name": "[email protected]", "type": "user", "roles": [], "password": "password"}' ``` _Response_ ```json { "ok": true, "id": "org.couchdb.user:[email protected]", "rev": "1-19fa61446d76bcb9131a1b65c03b4c1c" } ``` - Replicate `_users` from `A` to `B` _Request_ ```shell curl -X POST http://$A:5984/_replicate \ -d '{"source":"http://$A:5984/_users","target":"http://$B:5984/_users","create_target":true}' \ -H "Content-Type: application/json" ``` _Response_ ```json { "ok": true, "session_id": "...", "..." } - Delete the user document from `A` _Request_ ```shell curl -X DELETE http://$A:5984/_users/org.couchdb.user:[email protected]?rev=1-19fa61446d76bcb9131a1b65c03b4c1c ``` _Response_ ```json { "ok": true, "id": "org.couchdb.user:[email protected]", "rev": "2-43b4189bc429587a529beba79a037cad" } ``` - Replicate `_users` from `A` to `B` once again _Request_ ```shell curl -X POST http://$A:5984/_replicate \ -d '{"source":"http://$A:5984/_users","target":"http://$B:5984/_users","create_target":true}' \ -H "Content-Type: application/json" ``` _Response_ ```json { "ok": true, "session_id": "...", "..." } - Re-create the same user document again on `A` _Request_ ```shell curl -X PUT http://$A:5984/_users/org.couchdb.user:[email protected] -d '{"name": "[email protected]", "type": "user", "roles": [], "password": "password"}' ``` _Response_ ```json { "ok": true, "id": "org.couchdb.user:[email protected]", "rev": "3-1a2c0e3876f314e08d80b1d236481a2d" } ``` - Replicate `_users` from `A` to `B` _Request_ ```shell curl -X POST http://$A:5984/_replicate \ -d '{"source":"http://$A:5984/_users","target":"http://$B:5984/_users","create_target":true}' \ -H "Content-Type: application/json" ``` _Response_ ```json { "ok": true, "session_id": "...", "..." } ``` ## Expected behavior The user document might be replicated from `A` to `B` and the number of documents on `A/_users` and `B/_users` might be equal to 2. ## Current behavior The document is not replicated and the number of documents on `A/_users` is equal to 2 but the number of documents on `B/_users` is equal to 1. ## Environment - Server `A` - OS: Fedora 28 - CouchDB: 2.1.2 - Server `B` - OS: CentOS 7.5.1804 - CouchDB: 2.1.2 This issue is quite impacting for us as it silently breaks replication and can lead to data loss. Thanks in advance for helping us on this bug. Do not hesitate to ask me for more infos if needed.
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