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From "Randall Leeds (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COUCHDB-1367) When settings revs_limit on db - the db increases its update_seq counter when viewing stats - but not when getting changes
Date Fri, 23 Dec 2011 02:01:30 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-1367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13175228#comment-13175228
] 

Randall Leeds commented on COUCHDB-1367:
----------------------------------------

I suggested the heartbeat because we could make it look like last_seq, but we don't even need
to use heartbeat. We could emit a change that doesn't have a corresponding id and revisions.
Although, since the URL is /db/_revs_limit, we could (to use that example) emit something
like:

{"seq":X,"id":"_revs_limit","changes":[]}

I have no idea how badly that confuse existing clients, including CouchDB. Putting it on the
db info is the least obtrusive from an API standpoint. From a code internals, I think everything
would require some change (with the exception of doing nothing about this). I'm going to step
away for now, but if you need any more color swatches I can send over some more samples.
                
> When settings revs_limit on db - the db increases its update_seq counter when viewing
stats - but not when getting changes
> --------------------------------------------------------------------------------------------------------------------------
>
>                 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
>            Assignee: Bob Dionne
>            Priority: Minor
>              Labels: revs_limit
>
> If you put a number to _revs_limit on a db (to update it) - the http://host/dbname/ info
document gets an increase in update_seq number - however the changes feed does not contain
this change (while its not a change). This causes the update_seq in the dbinfo doc and the
last seq in the changes feed to differ - which breaks any application depending on the update_seq
number as the expected sequence size of the db (in my case - couchdb-lucene that will only
respond to stale requests because it thinks its not up to date)
> I know this is an edge case - but still its something fairly fundamental - that clearly
is not working as intended. 

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