[COUCHDB-2767] CouchDB 2.X: _changes?feed=longpoll returns an invalid response

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Fix Version/s: 2.0.0
• Component/s: HTTP Interface
• Assignee: Robert Newson
• Reporter: Will Holley
• Created: 04/Aug/15 09:39
• Updated: 27/Oct/15 21:51
• Resolved: 04/Aug/15 16:28

Description

_changes?feed=longpoll seems to be broken in CouchDB master.

In CouchDB 1.6.1:

$ curl http://127.0.0.1:5984/testlongpoll -XPUT
{"ok":true}

$ curl 'http://127.0.0.1:5984/testlongpoll/_changes?feed=longpoll' 
 {"results":[
],
"last_seq":0}

For the last request, the connection is held open (as expected) before the final part of the response is returned.

In CouchDB 2.X/master:

$ curl 'http://127.0.0.1:15984/testlongpoll' -XPUT 
{"ok":true}

$curl 'http://127.0.0.1:15984/testlongpoll/_changes?feed=longpoll'
{"results":[

CouchDB 2.X closes the connection immediately, resulting in invalid JSON.

The PouchDB test suite detected this around 13 days ago, coinciding with https://github.com/apache/couchdb-chttpd/commit/3866725ee99c6d89aff91ecb70a3b3cbbabaed8c, so I'd guess this is the first place to investigate.