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https://issues.apache.org/jira/browse/COUCHDB-1367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13177798#comment-13177798
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Robert Newson commented on COUCHDB-1367:
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I still don't see why we need do anything. My early mistaken understanding of 
this value should not be used as motivation here. At the time, I was not a 
"couchdb committer" so the earlier implication that it escaped even my awesome 
knowledge is to impute omniscience where none is warranted.

I haven't yet fixed couchdb-lucene as the update model is rather clumsy. Simply 
calling _changes?since=N instead of comparing update_seq with a local value 
will radically simplify that piece of couchdb-lucene. It should improve the 
internals of couchdb-lucene so significantly that I would rather *not* fix 
update_seq to work the way I expected years ago, in case it misleads someone 
into making the same mistake I made.

That said, I wouldn't veto the change, but C-L will not depend on either the 
current or any future meaning of update_seq in the next release.
                
> update_seq does not always reflect the seq of the latest document update
> ------------------------------------------------------------------------
>
>                 Key: COUCHDB-1367
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-1367
>             Project: CouchDB
>          Issue Type: Bug
>          Components: HTTP Interface
>    Affects Versions: 1.1.1
>         Environment: Any
>            Reporter: Henrik Hofmeister
>            Priority: Minor
>              Labels: revs_limit
>
> Certain operations, (currently _revs_limit and _security changes) cause the 
> database header's update_seq to increase when the by_seq index (and therefore 
> _changes) has not changed, which is confusing in light of the naming 
> consistency.

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