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From "Michael McCandless (JIRA)" <>
Subject [jira] [Commented] (LUCENE-5124) fix+document+rename DiskDV to Lucene45
Date Fri, 19 Jul 2013 17:10:48 GMT


Michael McCandless commented on LUCENE-5124:

> fix+document+rename DiskDV to Lucene45
> --------------------------------------
>                 Key: LUCENE-5124
>                 URL:
>             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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