lucene-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (LUCENE-1177) IW.optimize() can do too many merges at the very end
Date Thu, 14 Feb 2008 15:29:08 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-1177?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael McCandless resolved LUCENE-1177.
----------------------------------------

    Resolution: Fixed

Committed to 2.3 (and was already fixed on trunk).

> IW.optimize() can do too many merges at the very end
> ----------------------------------------------------
>
>                 Key: LUCENE-1177
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1177
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>    Affects Versions: 2.3
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>            Priority: Minor
>             Fix For: 2.4
>
>         Attachments: LUCENE-1177.patch
>
>
> This was fixed on trunk in LUCENE-1044 but I'd like to separately
> backport it to 2.3.
> With ConcurrentMergeScheduler there is a bug, only when CFS is on,
> whereby after the final merge of an optimize has finished and while
> it's building its CFS, the merge policy may incorrectly ask for
> another merge to collapse that segment into a compound file.  The net
> effect is optimize can spend many extra iterations unecessarily
> merging a single segment to collapse it to compound file.
> I believe the case is rare (hard to hit), and maybe only if you have
> multiple threads calling optimize at once (the TestThreadedOptimize
> test can hit it), but it's a low-risk fix so I plan to commit to 2.3
> shortly.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


---------------------------------------------------------------------
To unsubscribe, e-mail: java-dev-unsubscribe@lucene.apache.org
For additional commands, e-mail: java-dev-help@lucene.apache.org


Mime
View raw message