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https://issues.apache.org/jira/browse/LUCENE-1741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12730560#action_12730560
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Eks Dev commented on LUCENE-1741:
---------------------------------
Uwe, you convinced me, I looked at the code, and indeed, no performance penalty
for this.
what helped me was 1.1G... (I've tried to find maximum); Max file size is 1.4G
... but 1.1 is just OS coincidence, no magic about it.
I guess 512mb makes a good value, if memory is so fragmented that you cannot
allocate 0.5G, you are definitely having some other problems around. We are
taliking here about VM memory, and even on windows having 512Mb in block is not
an issue (or better said, I have never seen problems with this value).
@Paul: It is misunderstanding, my "algorithm" was meant to be manual... no
catching OOM and retry (I've burned my fingers already on catching
RuntimeException, do only when absolutely desperate :). Uwe made this value
user settable anyhow.
Thanks Uwe!
> Make MMapDirectory.MAX_BBUF user configureable to support chunking the index
> files in smaller parts
> ---------------------------------------------------------------------------------------------------
>
> Key: LUCENE-1741
> URL: https://issues.apache.org/jira/browse/LUCENE-1741
> Project: Lucene - Java
> Issue Type: Improvement
> Affects Versions: 2.9
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Priority: Minor
> Fix For: 2.9
>
> Attachments: LUCENE-1741.patch, LUCENE-1741.patch
>
>
> This is a followup for java-user thred:
> http://www.lucidimagination.com/search/document/9ba9137bb5d8cb78/oom_with_2_9#9bf3b5b8f3b1fb9b
> It is easy to implement, just add a setter method for this parameter to
> MMapDir.
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