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https://issues.apache.org/jira/browse/COUCHDB-3048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15356971#comment-15356971
]
Will Holley commented on COUCHDB-3048:
--
I traced this to
[chttpd_db:changes_callback/2|https://github.com/apache/couchdb-chttpd/blob/master/src/chttpd_db.erl#L202]
which gets called from
[fabric_view_changes:receive_results/4|https://github.com/apache/couchdb-fabric/blob/master/src/fabric_view_changes.erl#L218].
Near as I can tell, this has been the behaviour ~forever in bigcouch.
> Spurious empty lines returned in CouchDB master (2.0) filtered
> _changes?feed=normal
> ---
>
> Key: COUCHDB-3048
> URL: https://issues.apache.org/jira/browse/COUCHDB-3048
> Project: CouchDB
> Issue Type: Bug
>Reporter: Will Holley
> Attachments: generate.py
>
>
> I'm unsure if this counts as a breaking change but on a moderately sized
> database of ~50k documents and a filter which restricts this to 10 there
> appears to be a difference in the way that a normal _changes feed responds.
> In CouchDB 1.6:
> {code}
> $ curl
> 'http://localhost:5984/perftest/_changes?filter=filters/byOwner=test'
> {"results":[
> {"seq":1,"id":"test-0","changes":[{"rev":"1-dcb5fe05469e3bb1eb436b7936564594"}]},
> {"seq":2,"id":"test-1","changes":[{"rev":"1-e7969921a3a5f86603aff67a22d49107"}]},
> {"seq":3,"id":"test-2","changes":[{"rev":"1-500ca8ae80ccd45a6c8d94900aecb545"}]},
> {"seq":4,"id":"test-3","changes":[{"rev":"1-f65f4913783c95ec85e4e41e064e37cd"}]},
> {"seq":5,"id":"test-4","changes":[{"rev":"1-33e0ee8bb8cf301d2027fb944cc5b620"}]},
> {"seq":6,"id":"test-5","changes":[{"rev":"1-58d49eb52ce6189bf119c340b6854007"}]},
> {"seq":7,"id":"test-6","changes":[{"rev":"1-4112d69d2c7329ce560d0bd120a9caa8"}]},
> {"seq":8,"id":"test-7","changes":[{"rev":"1-2785dfe15a23166cc6ddd139ef20bf64"}]},
> {"seq":9,"id":"test-8","changes":[{"rev":"1-8ae3af8ef47f89267135a68dcf938e74"}]},
> {"seq":10,"id":"test-9","changes":[{"rev":"1-6f2966760ff9dc2f4245229b3a3c3e9b"}]}
> ],
> "last_seq":50001}
> {code}
> In CouchDB master / 2.0:
> {code}
> $ curl
> 'http://localhost:15984/perftest/_changes?filter=filters/byOwner=test'
> {"results":[
> {"seq":"18831-g1HMeJzLYWBg4MhgTmHgz8tPSTV0MDQy1zMAQsMcoARTIkOS_P___7MymJMYGCQ6coFi7AamZhamqSaYOuCmGKGZkqQAJJPsQQYlMsBVGaOrcgCpiiekKgGkqh7dUYYp5oaGRkaYmnAalMcCJBkagBTQrPn4rISoXABRuR9obSIj2M6UFIuUJFMTPHaiBwTEpAMQk-4j24ke8BCVDyAqYV6tA1trkpiYZGSajKkxCwAbFXRa","id":"test-2","changes":[{"rev":"1-70a675401648ce6ec79ab33521f3b8ec"}]},
> {"seq":"25103-g1IPeJzLYWBg4MhgTmHgz8tPSTV0MDQy1zMAQsMcoARTIkOS_P___7MymJMYGCQ6coFi7AamZhamqSaYOuCmGKGZkqQAJJPsQQYlMsBVGaOrcgCpiodYl8gItsvc0MLMwsQEUwduUxJAptSjO9owxdzQ0MiIBIPyWIAkQwOQApo1H2pYPdgwo2RTS-PEZJINWwAxbD_CfykpFilJpvj8hx6WEJMOQEy6jxye6HEHUfkAohIWGnVga00SE5OMTJMxNWYBAJAfgqM","id":"test-0","changes":[{"rev":"1-efbd209234f6e958e7d418c91879d5b8"}]},
> {"seq":"25104-g1IveJyV0dENgjAQANBTTPTPX_90AkNLS8uXbKItJSEEcQPx0y10E91EN8FCFWMbTEiTa9LeveauBQDMMk_BvDyoFMUIs7WvFyr0xViAXNZ1nWeeBFic9_ps6tOQ05S4FZ2CLUWudJQbA4lRq_DUV5hFbkWnBLYSN8r2R2GIh5wQt6Jf2TVKZTeFFEMI4wFQOdERTnrT1uWNVS2GExoFIhmMXQ12-_anFFeS_uvPnrWR7kZ65AJ6_9ZkPk3mZxrH9lkihMQ0cQvzF7B0iZY","id":"test-1","changes":[{"rev":"1-68ba5af86f75d84caba05684cb3c831f"}]},
> {"seq":"25105-g1JPeJyV0VEOgiAYB3DKtnrrtbc6QQMEwae8SYHYnDO7QfbYLeomdZO6iaGULlhuju1j-9j_t30fOQBglnoKzIujSlCEMFtDfVCuH8YCyGnqSQAWl4PuTSENOE2Im2gVbClypavcGEiMGoUnUGEWuolW8W0lqpXtj8IQDzghbuK_squV0h4KKYYQxgOgYqIrOOtLW9cPVjYYjmnoi3gwdjPYvZtPKa4k7ZvP3rWRHkZ6dhKUnOy56Nm3_fdGehnpu61TgxEhJKaxG8zeBIqQsw","id":"test-3","changes":[{"rev":"1-fc04f71360bd40bd01e0d42e17feb280"}]},
> {"seq":"25106-g1JPeJyV0UEOgjAQBdARTHTn1p2ewNDS0rKSm2hLMYQg3kBcegu9id5Eb4KFKsYSSUiTadLmv2RmcgCYpq6CWXFQCYoQZitPH5TrD0eAXFRVlaWuBJif9_pt4tGA04R0E62CLUUudZVrA4lRo_DEU5iF3USr-LYS1crmR2GIB5yQbuK_sq2V0m4KKYYQxgOgYqwrnPSlrcsbKxsMxzT0RTwYuxrs9u1PKa4k7evPnrWR7kZ61JJjtiY52XHRM29790Z6GukzrWODESEkpnE3mL0ABPeQtA","id":"test-7","changes":[{"rev":"1-55ff855aa18e4b59db946761bd9e015c"}]},
> {"seq":"25107-g1JPeJyV0VEOgiAcBnDKtnrrtbc6QQMEwae8SYHYnDO7QfbYLeomdZO6iSGYbrjcHBtssO-3_T9yAMAi9RRYFmeVoAhhtoV6oVw_TAWQ66qqstSTAKxuJ303hzTgNCH9RKtgR5EbvcudhcTEKDyBCrOwn2gV31WiWtk3ytQoDPGAE9JP_FcOtVK6QyHFEMJ4BFTM9A6u-tDWvcFKg-GYhr6IR2MPiz27lpTiStKh-dyurfSy0rtrCkpOjlwM9O3-vZU-Vvq1dTEYEUJiGveD2RcGjpC1","id":"test-4","changes":[{"rev":"1-7f48ebbf80f2cbc3d9106eccfffc6d0d"}]},
> {"seq":"25108-g1JPeJyV0VEOgiAYB3DKtnrrtbc6QQMEwae8SYHYnDO7QfbYLeomdZO6iSGYbrjcHNvH9rH_b_s-cgDAIvUUWBZnlaAIYbaF-qBcP0wFkOuqqrLUkwCsbifdm0MacJqQfqJVsKPIja5yZyExMQpPoMIs7CdaxXeVqFb2jTI1CkM84IT0E_-VQ62U7lBIMYQwHgEVM13BVV_aujdYaTAc09AX8WjsYbFnN59SXEk6NJ-7ayu9rPTuJCg5OXIxsG_37630sdJvWxeDESEkpnE_mH0BB0WQtg","id":"test-6","changes":[{"rev":"1-c6c386a7da07f025b6a4711d26d13b42"}]}
> ,
>