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https://issues.apache.org/jira/browse/LUCENE-4372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13452078#comment-13452078
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Robert Muir commented on LUCENE-4372:
-------------------------------------
{quote}
But in the case where the user just wants to have the docs (+scores) cached, I
agree it's useless to continue to delegate. The Collector just as well might
throw an exception. To optimize it, we'll need to add an 'if' check, or create
another specialized CachingCollector impl ... or continue to call the empty
Collector impl, hoping the right thing will happen
{quote}
Do we? I think i'm just proposing to modify the existing 'if' check (if curDocs
== null) to do nothing at all or to throw an exception earlier :)
> CachingCollector.create(boolean, boolean, double) is trappy
> -----------------------------------------------------------
>
> Key: LUCENE-4372
> URL: https://issues.apache.org/jira/browse/LUCENE-4372
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Robert Muir
>
> Followup to LUCENE-3102.
> Shai proposed a method that just caches all scores so they can be replayed:
> {quote}
> Do you think we can modify this Collector to not necessarily wrap another
> Collector? We have such Collector which stores (in-memory) all matching doc
> IDs + scores (if required). Those are later fed into several processes that
> operate on them (e.g. fetch more info from the index etc.). I am thinking, we
> can make CachingCollector optionally wrap another Collector and then someone
> can reuse it by setting RAM limit to unlimited (we should have a constant for
> that) in order to simply collect all matching docs + scores.
> {quote}
> But Mike had concerns about the RAM usage:
> {quote}
> I'd actually rather not have the constant – ie, I don't want to make
> it easy to be unlimited? It seems too dangerous... I'd rather your
> code has to spell out 10*1024 so you realize you're saying 10 GB (for
> example).
> {quote}
> My concern here is what happens when you dont specify enough, I think those
> hits are just silently dropped (which is worse than using lots of RAM).
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