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From "Norman Maurer (JIRA)" <server-...@james.apache.org>
Subject [jira] Updated: (IMAP-193) UIDNEXT generation is a big performance killer and should get reworked
Date Wed, 20 Oct 2010 05:55:26 GMT

     [ https://issues.apache.org/jira/browse/IMAP-193?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Norman Maurer updated IMAP-193:

    Fix Version/s:     (was: 0.2)

> UIDNEXT generation is a big performance killer and should get reworked
> ----------------------------------------------------------------------
>                 Key: IMAP-193
>                 URL: https://issues.apache.org/jira/browse/IMAP-193
>             Project: JAMES Imap
>          Issue Type: Improvement
>    Affects Versions: 0.1
>            Reporter: Norman Maurer
>            Assignee: Norman Maurer
>             Fix For: 0.2-M1
> In the store api we generate the uid for a new message and guaranteer that the Mailbox.getLastUid()
method will return this value after it is stored. For this we save the message and the mailbox
and use for example a row lock (in jpa land) for this to get rid of ghost-reads etc. 
> This is a big performance killer and is not needed at all. In the rfc its clearly stated
that the used uid for the next saved message must just be equal or bigger then the UIDNEXT
> From rfc:
>         Note: The next unique identifier value is intended to
>         provide a means for a client to determine whether any
>         messages have been delivered to the mailbox since the
>         previous time it checked this value.  It is not intended to
>         provide any guarantee that any message will have this
>         unique identifier.  A client can only assume, at the time
>         that it obtains the next unique identifier value, that
>         messages arriving after that time will have a UID greater
>         than or equal to that value.

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