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Date: Mon, 13 Sep 2010 21:23:33 -0400 (EDT)
From: "Randall Leeds (JIRA)" <jira@apache.org>
To: dev@couchdb.apache.org
Subject: [jira] Commented: (COUCHDB-887) _log handler has very odd semantics
 for bytes/offset, probably a bug
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    [ https://issues.apache.org/jira/browse/COUCHDB-887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12909083#action_12909083 ] 

Randall Leeds commented on COUCHDB-887:
---------------------------------------

Your patch reverses the semantics of offset, but it's not clear that one is more right.

If your intuition about offet being a negative from the end is right, then I'd expect:

Start = lists:max([LogFileSize - Offset])

where Bytes determines how many bytes to read, but has no effect on where reading begins.

However, in either case I think you're right that Bytes should be passed to file:pread/3 instead of LogFileSize.

> _log handler has very odd semantics for bytes/offset, probably a bug
> --------------------------------------------------------------------
>
>                 Key: COUCHDB-887
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-887
>             Project: CouchDB
>          Issue Type: Bug
>          Components: HTTP Interface
>    Affects Versions: 0.11, 0.11.1, 0.11.2, 1.0, 1.0.1
>            Reporter: Nuutti Kotivuori
>            Priority: Trivial
>         Attachments: couch_log.erl.diff
>
>
> The _log method for couchdb servers has query arguments "bytes" and "offset", but they seem to behave really weirdly. If offset >= bytes, an eof error is returned - otherwise offset is just substracted from bytes and the request behaves identically otherwise.
> A simple fix to the expected behaviour is included - offset counts backwards from bytes.

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