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https://issues.apache.org/jira/browse/LUCENE-2960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13005891#comment-13005891
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Earwin Burrfoot commented on LUCENE-2960:
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bq. Furthermore, closing the IW also forces you to commit, and I don't like
tying changing of configuration to forcing a commit.
Like I said, one isn't going to change his configuration five times a second.
It's ok to commit from time to time?
bq. So why should we force it to be unchangeable? That can only remove freedom,
freedom that is perhaps valuable to an app somewhere.
Each and every live reconfigurable setting adds to complexity.
At the very least it requires proper synchronization. Take your SegmentWarmer
example - you should make the field volatile.
While it's possible to chicken out on primitive fields ([except
long/double|http://java.sun.com/docs/books/jls/third_edition/html/memory.html#17.7]),
as Yonik mentioned earlier, making nonvolatile mutable references introduces
you to a world of hard-to-catch unsafe publication bugs (yes, infoStream is
currently broken!).
For more complex cases, certain on-change logic is required. And then you have
to support this logic across all possible code rewrites and refactorings.
> 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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