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From "Brad Anderson (JIRA)" <>
Subject [jira] Created: (COUCHDB-389) [PATCH] Make offset calculation more available during btree folding
Date Thu, 18 Jun 2009 21:14:07 GMT
[PATCH] Make offset calculation more available during btree folding

                 Key: COUCHDB-389
             Project: CouchDB
          Issue Type: Improvement
          Components: Database Core
    Affects Versions: 0.9
            Reporter: Brad Anderson
            Priority: Minor
         Attachments: clustered_offset.patch

When CouchDB returns no values for _all_docs (or potentially any fold over the btree), then
no offset is calculated, either.  This is not a problem in non-clustered CouchDB.  However,
when you are in a clustered environment and treat each shard as its own CouchDB, then not
returning an offset when no values are found on the shard can be problematic.  The specific
case is if there is a startkey or skip specified, and there were values before (or after with
descending=true) the startkey or skip values, but there are no current values.

Moving the Offset calculation to be available for all clauses in the return fun of couch_httpd_view:make_view_fold_fun/6
allows the user to store Offsets in the RowFunAcc and client code using this function will
work as expected.

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