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https://issues.apache.org/jira/browse/LUCENE-4764?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13575438#comment-13575438
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Robert Muir commented on LUCENE-4764:
-------------------------------------
{quote}
I think that 30% more RAM is ok .. i.e. either you will have enough RAM on the
machine, or those 30% won't make a big difference (for really large indexes).
{quote}
This is misleading. Its not a constant 30%. The larger the index, the larger
the cost.
{quote}
E.g., if facets were in core, then we could modify IWC to detect when facets
are used (e.g. isEnableFacets) and then create the optimized Codec for them...
{quote}
I would be against this even if facets were in core. I think its ok to add this
option, but i don't think its a good default. I think the benchmark being used
here is easily misleading.
> Faster but more RAM/Disk consuming DocValuesFormat for facets
> -------------------------------------------------------------
>
> Key: LUCENE-4764
> URL: https://issues.apache.org/jira/browse/LUCENE-4764
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 4.2, 5.0
>
> Attachments: LUCENE-4764.patch
>
>
> The new default DV format for binary fields has much more
> RAM-efficient encoding of the address for each document ... but it's
> also a bit slower at decode time, which affects facets because we
> decode for every collected docID.
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