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From "Robert Newson (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (COUCHDB-1665) _replicator and _users
Date Fri, 01 Feb 2013 12:38:12 GMT

     [ https://issues.apache.org/jira/browse/COUCHDB-1665?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Newson resolved COUCHDB-1665.
------------------------------------

    Resolution: Not A Problem
    
> _replicator and _users
> ----------------------
>
>                 Key: COUCHDB-1665
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-1665
>             Project: CouchDB
>          Issue Type: Bug
>          Components: Replication
>            Reporter: Tibor Gemes
>
> I've set up 2 servers, one local and one remote. I want to replicate the _users database
always. So I decided to add a document to the _replicator database. This seems to be fine.
But after I add a user document to the _users database, the replicator keeps failing. It is
in an endless triggered-error-triggered-error cycle, but the replication does not take place.
If I call _replicate with the same json, then the replication happens perfectly. If the two
_users databases are in sync then the replicator document settles in the triggered state.
  
> Here is a simple testcase to reproduce. The local and remote databases are freshly created:
> {code}
> curl  -H "Content-type: application/json" -X PUT -d "{\"source\": \"_users\", \"target\":
\"${REMOTE_URL}/_users\", \"continuous\":  true, \"user_ctx\": {\"name\": \"admin\", \"roles\":
[\"admin\"]}}" ${LOCAL_URL}/_replicator/users:devices_users
> {"ok":true,"id":"users:devices_users","rev":"1-010f00d464fba86a2820371c7bf04900"}
> curl -X GET  ${LOCAL_URL}/_replicator/users:devices_users
> {"_id":"users:devices_users","_rev":"2-1df51063f46e4465ec1f6aaad7b03cd7","source":"_users","target":"http://admin:devices@devices-db:5984/_users","continuous":true,"user_ctx":{"name":"admin","roles":["admin"]},"owner":"admin","_replication_state":"triggered","_replication_state_time":"2013-02-01T12:57:05+01:00","_replication_id":"d78c7d9b7b215c6f2a3cb99c41f6be4c"}
> curl -X PUT -d  '{ "type": "user",   "name": "u1",  "roles": ["u1"],  "password": "XXX"}'
${LOCAL_URL}/_users/org.couchdb.user:u1
> {"ok":true,"id":"org.couchdb.user:u1","rev":"1-f27f72a514abae8078740c792d5a0795"}
> curl -X GET  ${LOCAL_URL}/_replicator/users:devices_users
> {"_id":"users:devices_users","_rev":"3-c0ee7e14995877591740ee3191c147df","source":"_users","target":"http://admin:devices@devices-db:5984/_users","continuous":true,"user_ctx":{"name":"admin","roles":["admin"]},"owner":"admin","_replication_state":"error","_replication_state_time":"2013-02-01T12:57:52+01:00","_replication_id":"d78c7d9b7b215c6f2a3cb99c41f6be4c"}
> curl -X GET  ${LOCAL_URL}/_replicator/users:devices_users
> {"_id":"users:devices_users","_rev":"9-e16eff5cb75c2620a429ba0610bbf487","source":"_users","target":"http://admin:devices@devices-db:5984/_users","continuous":true,"user_ctx":{"name":"admin","roles":["admin"]},"owner":"admin","_replication_state":"error","_replication_state_time":"2013-02-01T12:58:08+01:00","_replication_id":"d78c7d9b7b215c6f2a3cb99c41f6be4c"}
> curl -X GET ${REMOTE_URL}/_users/org.couchdb.user:u1
> {"error":"not_found","reason":"missing"}
> curl  -H "Content-type: application/json" -X POST -d  "{\"source\": \"_users\", \"target\":
\"${REMOTE_URL}/_users\"}" ${LOCAL_URL}/_replicate
> {"ok":true,"session_id":"bc58f3a39efb24ecbcb73114040c13b9","source_last_seq":2,"replication_id_version":2,"history":[{"session_id":"bc58f3a39efb24ecbcb73114040c13b9","start_time":"Fri,
01 Feb 2013 12:02:07 GMT","end_time":"Fri, 01 Feb 2013 12:02:07 GMT","start_last_seq":0,"end_last_seq":2,"recorded_seq":2,"missing_checked":2,"missing_found":1,"docs_read":1,"docs_written":1,"doc_write_failures":0}]}
> curl -X GET ${REMOTE_URL}/_users/org.couchdb.user:u1
> {"_id":"org.couchdb.user:u1","_rev":"1-f27f72a514abae8078740c792d5a0795","type":"user","name":"u1","roles":["u1"],"password_sha":"da3b3bd9b957aafe94e9abce96bea95150d3dc8c","salt":"203b9f2e2bde5de40f107e84a4fec173"}
> curl -X GET  ${LOCAL_URL}/_replicator/users:devices_users
> {"_id":"users:devices_users","_rev":"102-1bd305355290f8209985e2284250e8ce","source":"_users","target":"http://admin:devices@devices-db:5984/_users","continuous":true,"user_ctx":{"name":"admin","roles":["admin"]},"owner":"admin","_replication_state":"triggered","_replication_state_time":"2013-02-01T13:02:12+01:00","_replication_id":"d78c7d9b7b215c6f2a3cb99c41f6be4c"}
> {code}
> Here is what I see in the couchdb log: 
> {code}
> [info] [<0.1742.0>] Document `users:devices_users` triggered replication `d78c7d9b7b215c6f2a3cb99c41f6be4c+continuous`
> [info] [<0.1736.0>] starting new replication `d78c7d9b7b215c6f2a3cb99c41f6be4c+continuous`
at <0.1742.0> (`_users` -> `h
> ttp://admin:*****@devices-db:5984/_users/`)
> [error] [emulator] Error in process <0.1749.0> with exit value: {{nocatch,not_found},[{couch_users_db,after_doc_read,2,[
> {file,"couch_users_db.erl"},{line,99}]},{couch_db,'-open_doc_revs_int/3-fun-0-',3,[{file,"couch_db.erl"},{line,1166}]},{
> lists,map,2,[{file,"lists.erl"},{line,1173}]},{couch_db,'-open_doc_revs_int/3-fun-1-'...

> =ERROR REPORT==== 1-Feb-2013::13:02:07 ===
> Error in process <0.1749.0> with exit value: {{nocatch,not_found},[{couch_users_db,after_doc_read,2,[{file,"couch_users_
> db.erl"},{line,99}]},{couch_db,'-open_doc_revs_int/3-fun-0-',3,[{file,"couch_db.erl"},{line,1166}]},{lists,map,2,[{file,
> "lists.erl"},{line,1173}]},{couch_db,'-open_doc_revs_int/3-fun-1-'... 
> [error] [<0.1742.0>] Worker <0.1749.0> died with reason: {{nocatch,not_found},
>                                                           [{couch_users_db,
>                                                             after_doc_read,2,
>                                                             [{file,
>                                                               "couch_users_db.erl"},
>                                                              {line,99}]},
>                                                            {couch_db,
>                                                             '-open_doc_revs_int/3-fun-0-',
>                                                             3,
>                                                             [{file,
>                                                               "couch_db.erl"},
>                                                              {line,1166}]},
>                                                            {lists,map,2,
>                                                             [{file,
>                                                               "lists.erl"},
>                                                              {line,1173}]},
>                                                            {couch_db,
>                                                             '-open_doc_revs_int/3-fun-1-',
>                                                             4,
>                                                             [{file,
>                                                               "couch_db.erl"},
>                                                              {line,1158}]},
>                                                            {lists,zipwith,3,
> ...
> {code}

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