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https://issues.apache.org/jira/browse/LUCENE-5124?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir resolved LUCENE-5124.
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Resolution: Fixed
Fix Version/s: 4.5
5.0
> 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
> Fix For: 5.0, 4.5
>
>
> 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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