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https://issues.apache.org/jira/browse/SOLR-4074?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13497168#comment-13497168
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Mark Miller commented on SOLR-4074:
-----------------------------------

Yeah, I actually thought about making the change in lucene too - was tired this 
morning and don't remember why I decided against. I guess part of it was 
thinking that Solr is a search server and so it was more important that it 
default to 100 here. Lucene being a lib, it's was slightly more plausible that 
lucene could stick with 32 - I didn't remember the reasons it was first set to 
that.

I'm +1 on changing in Lucene as well though. I think it it will benefit way 
more people that it will harm (whom can just lower it). I'll create an issue.
                
> We should default ramBufferSizeMB to around 100
> -----------------------------------------------
>
>                 Key: SOLR-4074
>                 URL: https://issues.apache.org/jira/browse/SOLR-4074
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Mark Miller
>            Assignee: Mark Miller
>            Priority: Minor
>             Fix For: 4.1, 5.0
>
>
> You get diminishing returns after 100, but gains up to 100. In this day and 
> age of RAM, it seems better to default to 100 and have essentially the top 
> indexing speed the buffer can give us.

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