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From "Jason Smith (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 Mon, 26 Dec 2011 03:22:31 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-1367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13175877#comment-13175877
] 

Jason Smith commented on COUCHDB-1367:
--------------------------------------

Wait a second. Robert, you are not fixing a bug in C-L, you are working around a deficiency
in CouchDB.

The only way to know the latest sequence id is to make a complete _changes query. Next, follow
that up with a continuous feed if you want to keep the state fresh.

That is a paper cut.

What if I want to see the most recent five changes? What if there are a hundred million documents?
What if 99% of the time, update_seq equals last_seq and so developers assume it means something
it doesn't?

Everybody wants to know the id of the latest change. Nobody wants to know the "update sequence,"
whatever that is. If CouchDB can cache last_seq in the header and provide it in the DB response,
that would be fantastic. Kindly reopen this ticket, then. Thanks!
                
> 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
>            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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