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https://issues.apache.org/jira/browse/LUCENE-2960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13005646#comment-13005646
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Yonik Seeley commented on LUCENE-2960:
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bq. InfoStream, for example, should remain live

Agree - it's logging.

bq. But take MergedSegmentWarmer (used to be live but is now unchangeable). 
This is a setting that obviously can easily remain live; there's no technical 
reason for it not to be.

Anyone's implementation can be live (i.e. the impl could change it's behavior 
over time for whatever reason).


> Allow (or bring back) the ability to setRAMBufferSizeMB on an open IndexWriter
> ------------------------------------------------------------------------------
>
>                 Key: LUCENE-2960
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2960
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>            Reporter: Shay Banon
>            Priority: Blocker
>             Fix For: 3.1, 4.0
>
>
> In 3.1 the ability to setRAMBufferSizeMB is deprecated, and removed in trunk. 
> It would be great to be able to control that on a live IndexWriter. Other 
> possible two methods that would be great to bring back are 
> setTermIndexInterval and setReaderTermsIndexDivisor. Most of the other 
> setters can actually be set on the MergePolicy itself, so no need for setters 
> for those (I think).

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