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From "Wojtek Strzalka (JIRA)" <server-...@james.apache.org>
Subject [jira] Created: (IMAP-258) FetchProcessor optimization for mailboxes with non compacted UIDs
Date Sat, 12 Feb 2011 18:41:57 GMT
FetchProcessor optimization for mailboxes with non compacted UIDs 
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                 Key: IMAP-258
                 URL: https://issues.apache.org/jira/browse/IMAP-258
             Project: JAMES Imap
          Issue Type: Improvement
          Components: Mailbox
    Affects Versions: 0.2
            Reporter: Wojtek Strzalka
             Fix For: 0.2


Current FetchProcessor implementation divides the requested message range to batch set using
some configuration parameter to avoid OOM.

Then for each batch range it calls the mailbox to return messages in this range. This can
lead to serious performance problems when you have mailbox with non-consistent UID values.
I.e. you can have mailbox with 2 messages in it
message 1 UID=1
message 2 UID=1000000
Regular client fetch will look like "UID FETCH 1:1000000 (...)" - this is real case what MS
Outlook will do.
So the current mail implementation with default batch set will split it to 10k of batches
and then call mailbox 10k times...... 



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