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From "Michael McCandless (JIRA)" <>
Subject [jira] [Commented] (LUCENE-5123) invert the codec postings API
Date Fri, 19 Jul 2013 17:08:48 GMT


Michael McCandless commented on LUCENE-5123:


I think this would allow for more innovation in PostingsFormats ...
> invert the codec postings API
> -----------------------------
>                 Key: LUCENE-5123
>                 URL:
>             Project: Lucene - Core
>          Issue Type: Wish
>            Reporter: Robert Muir
> Currently FieldsConsumer/PostingsConsumer/etc is a "push" oriented api, e.g. FreqProxTermsWriter
streams the postings at flush, and the default merge() takes the incoming codec api and filters
out deleted docs and "pushes" via same api (but that can be overridden).
> It could be cleaner if we allowed for a "pull" model instead (like DocValues). For example,
maybe FreqProxTermsWriter could expose a Terms of itself and just passed this to the codec
> This would give the codec more flexibility to e.g. do multiple passes if it wanted to
do things like encode high-frequency terms more efficiently with a bitset-like encoding or
other things...
> A codec can try to do things like this to some extent today, but its very difficult (look
at buffering in Pulsing). We made this change with DV and it made a lot of interesting optimizations
easy to implement...

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