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Date: Sun, 5 Jul 2009 19:33:14 -0700 (PDT)
From: "Brad Anderson (JIRA)" <jira@apache.org>
To: dev@couchdb.apache.org
Subject: [jira] Updated: (COUCHDB-389) [PATCH] Make offset calculation more
 available during btree folding
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     [ https://issues.apache.org/jira/browse/COUCHDB-389?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Brad Anderson updated COUCHDB-389:
----------------------------------

    Attachment: couchdb-389-2.svn.patch

> [PATCH] Make offset calculation more available during btree folding
> -------------------------------------------------------------------
>
>                 Key: COUCHDB-389
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-389
>             Project: CouchDB
>          Issue Type: Improvement
>          Components: Database Core
>    Affects Versions: 0.9
>            Reporter: Brad Anderson
>            Priority: Minor
>         Attachments: clustered_offset.patch, couchdb-389-2.svn.patch, couchdb-389.svn.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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