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https://issues.apache.org/jira/browse/LUCENE-5761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14180479#comment-14180479
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Per Steffensen edited comment on LUCENE-5761 at 10/22/14 8:30 PM:
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What is the alternative for those of us that have disk-doc-values in order to 
be able to sort/facet on certain fields? 

If we do not doc-value those fields the FieldCache will be used when 
sorting/faceting, which will make us go OOM - we have so much data that we will 
never be able to buy enough RAM to be able to hold all values of certain 
field(s) in memory (what the FieldCache does AFAIK). We have seen 
disk-doc-value as our only option, it actually works, and we can live with it 
being "slow"


was (Author: steff1193):
What is the alternative for those of us that have disk-doc-values in order to 
be able to sort/facet on certain fields? 

If we do not doc-value those fields the FieldCache will be used when 
sorting/faceting, which will make us go OOM - we have so much data that we will 
never be able to buy enough RAM to be able to hold all value of certain 
field(s) in memory (what the FieldCache does AFAIK). We have seen 
disk-doc-value as our only option, it actually works, and we can live with it 
being "slow"

> Remove DiskDocValuesFormat
> --------------------------
>
>                 Key: LUCENE-5761
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5761
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Robert Muir
>             Fix For: 4.9, Trunk
>
>         Attachments: LUCENE-5761.patch
>
>
> I see users using this, i think they are unaware of the horrible tradeoffs it 
> makes.
> We don't e.g. have codecs that have the term dictionary entirely on disk or 
> other stupid things in lucene, so we shouldnt be stupid here either. 



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