action=wbeditentity for creation fails randomly with error edit-already-exists
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	liangent
	Jul 8 2013, 1:43 PM

Description

Request: {'format': 'json', 'bot': True, 'token': '****', 'action': 'wbeditentity', 'new': 'item', 'data': '{}'} in urlencoded form.

Response: {"servedby": "mw1115", "error": {"info": "Could not create a new page.\nIt already exists.", "code": "save-failed", "messages": {"0": {"type": "error", "name": "edit-already-exists"}, "html": {"*": "<p>Could not create a new page.\nIt already exists.\n</p>"}}}}

Per DanielK: "that sounds like a race condition. should not happen, the id increment function should be atomic."

Version: unspecified
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=46535

Details

Reference: bz50940

Event Timeline

• bzimport raised the priority of this task from to Medium.Nov 22 2014, 1:57 AM

• bzimport added a project: MediaWiki-extensions-WikibaseRepository.

• bzimport set Reference to bz50940.

• bzimport added a subscriber: Unknown Object (MLST).

liangent created this task.Jul 8 2013, 1:43 PM

Bug 52615 has been marked as a duplicate of this bug. ***

While the underlying problem shouldnt occur, the current error condition should be given a different error name because 'edit-already-exists' in core is a permanent error whereas Wikibase is using it for a transient & internal error condition.

If it has its own error code, software can detect this problem and decide whether to resubmit based on whether the Wikibase server version indicates resubmitting will resolve the error.(i.e. when talking to a server with the underlying bug is fixed, the software would not presume this error code is transient.)

As an example, pywikibot is currently resubmitting (25 times?) on any 'failed-save' error response, including (almost) permanent error conditions like wikibase-error-label-not-unique-item. I've provided sample code for better handling on bug 62126.

Lydia_Pintscher added a project: Wikidata.Dec 1 2014, 2:43 PM

Lydia_Pintscher removed a subscriber: Unknown Object (MLST).

duplicatebug unsubscribed.Dec 13 2014, 11:52 AM

If this bug still happens please reopen it.

Bugreporter closed this task as a duplicate of T103796: Unable to create item when other users are flooding.Jun 29 2015, 6:12 AM

Ricordisamoa subscribed.Jun 29 2015, 10:42 AM

action=wbeditentity for creation fails randomly with error edit-already-existsClosed, DuplicatePublicActions

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action=wbeditentity for creation fails randomly with error edit-already-exists
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