[jira] [Commented] (MAILBOX-198) Improve SimpleMessageSearchIndex performance

["Eric Charles (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAILBOX-198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13720667#comment-13720667 ] 

Eric Charles commented on MAILBOX-198:
--------------------------------------

Did you try this patch on a james instance serving real mail traffic?
                
> Improve SimpleMessageSearchIndex performance
> --------------------------------------------
>
>                 Key: MAILBOX-198
>                 URL: https://issues.apache.org/jira/browse/MAILBOX-198
>             Project: James Mailbox
>          Issue Type: Improvement
>            Reporter: Jan-Philipp Niewerth
>              Labels: PatchAvailable
>         Attachments: MAILBOX-198.patch
>
>
> SimpleMessageSearchIndex has O(n^2) performance for searches at the moment. This leads to very bad message check performance for e.g the Android Mailclient on big mailboxes.
> The reason for that is that the current code buffers messages in an ArrayList while performing an contains() check before each add(). A TreeSet is more appropriate here reducing runtime to O(n*log(n)). 
> Furthermore the existing UID range optimization is not effective when other criteria are conjugated with the query.

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