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From "Simon Willnauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4472) Add setting that prevents merging on updateDocument
Date Wed, 10 Oct 2012 22:37:03 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13473626#comment-13473626
] 

Simon Willnauer commented on LUCENE-4472:
-----------------------------------------

The MergePolicy is tricky here since we clone the MP in IW you need to actually pull and cast
the MP from IW to change the setting if you want to do this in realtime. Maybe we can add
something like this to MP so we can change MergeSettings in RT too. Otherwise you need to
build a special MP but we can certainly do that.
                
> Add setting that prevents merging on updateDocument
> ---------------------------------------------------
>
>                 Key: LUCENE-4472
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4472
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/index
>    Affects Versions: 4.0
>            Reporter: Simon Willnauer
>             Fix For: 4.1, 5.0
>
>         Attachments: LUCENE-4472.patch
>
>
> Currently we always call maybeMerge if a segment was flushed after updateDocument. Some
apps and in particular ElasticSearch uses some hacky workarounds to disable that ie for merge
throttling. It should be easier to enable this kind of behavior. 

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