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https://issues.apache.org/jira/browse/LUCENE-5124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13713856#comment-13713856
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Adrien Grand commented on LUCENE-5124:
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+1
                
> fix+document+rename DiskDV to Lucene45
> --------------------------------------
>
>                 Key: LUCENE-5124
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5124
>             Project: Lucene - Core
>          Issue Type: New Feature
>    Affects Versions: 4.5
>            Reporter: Robert Muir
>
> The idea is that the default implementation should not hold everything in 
> memory, we can have a "Memory" impl for that. I think stuff being all in heap 
> memory is just a relic of FieldCache.
> In my benchmarking diskdv works well, and its much easier to manage (keep a 
> smaller heap, leave it to the OS, no OOMs etc from merging large FSTs, ...)
> If someone wants to optimize by forcing everything in memory, they can then 
> use the usual approach (e.g. just use FileSwitchDirectory, or pick "Memory" 
> for even more efficient stuff).
> Ill keep the issue here for a bit. If we decide to do this, ill work up file 
> format docs and so on. We should also fix a few things that are not great 
> about it (LUCENE-5122) before making it the default.

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