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https://issues.apache.org/jira/browse/LUCENE-3216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13057935#comment-13057935
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Robert Muir commented on LUCENE-3216:
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{quote}
I am not sure here, I had the same thought but when you look at Solr and other
high level users they need to configure stuff somehow so I put all reasonable
core stuff in there. I think its ok to have this for only one codec. Thoughts?
{quote}
I don't like CodecConfig actually. It doesn't make sense that it contains all
these codec-specific parameters, which should be private to the codec. I think
lucene's codecs should just be APIs and have ordinary ctors.
As far as higher-level stuff like Solr, we can improve it there so its easier
for users to configure this stuff, for example the Solr codec configuration
allows you to specify a codecproviderfactory that takes arbitrary nested xml
and parses it however you want.
The only problem is we don't have a *concrete* (e.g. non-mock/test)
implementation in Solr that actually exposes all of what lucene can offer... I
would prefer we instead just do this, and make a SolrCodecProviderFactory that
lets you configure skip intervals, pulsing cutoffs, and all these other
codec-specific options in a type-safe way.
> Store DocValues per segment instead of per field
> ------------------------------------------------
>
> Key: LUCENE-3216
> URL: https://issues.apache.org/jira/browse/LUCENE-3216
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/index
> Affects Versions: 4.0
> Reporter: Simon Willnauer
> Assignee: Simon Willnauer
> Fix For: 4.0
>
> Attachments: LUCENE-3216.patch, LUCENE-3216.patch, LUCENE-3216.patch,
> LUCENE-3216.patch, LUCENE-3216.patch, LUCENE-3216.patch,
> LUCENE-3216_floats.patch
>
>
> currently we are storing docvalues per field which results in at least one
> file per field that uses docvalues (or at most two per field per segment
> depending on the impl.). Yet, we should try to by default pack docvalues into
> a single file if possible. To enable this we need to hold all docvalues in
> memory during indexing and write them to disk once we flush a segment.
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