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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4472) Add setting that prevents merging on updateDocument
Date Wed, 10 Oct 2012 14:27:03 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13473255#comment-13473255
] 

Michael McCandless commented on LUCENE-4472:
--------------------------------------------

Neat :)  How does ES customize / throttle its merging?

Maybe the setting should mean we never call maybeMerge implicitly?  (Ie, neither on close
nor NRT reader or any other time), rather than just singling out updateDocument/addDocument?
 Eg if we add other methods in the future (like field updates), it should also prevent those
from doing merges?
                
> 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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