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https://issues.apache.org/jira/browse/LUCENE-1749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12737247#action_12737247
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Mark Miller commented on LUCENE-1749:
-------------------------------------
bq. (BTW: random thought that occurred to me last night: wouldn't the simplest
way to implement the RamEstimator just be to use vanilla java serialization to
a custom OutputStream that just counted the bytes and sent them to /dev/null) ?
That's one way to go. Its got its own little issues though - some bookkeeping
stuff is not serialized, and extra info about class, fields is serialzied.
Transient fields (niche issue for sure) would also not be serialized. Its def
another way to get an estimate. I chose a different route after considering
both (googled the topic for a bit and looked at some examples before choosing).
I'd be open to another route, but I thought this method was fairly fast,
accurate, and generic.
> FieldCache introspection API
> ----------------------------
>
> Key: LUCENE-1749
> URL: https://issues.apache.org/jira/browse/LUCENE-1749
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Search
> Reporter: Hoss Man
> Priority: Minor
> Fix For: 2.9
>
> Attachments: fieldcache-introspection.patch, LUCENE-1749.patch,
> LUCENE-1749.patch, LUCENE-1749.patch, LUCENE-1749.patch, LUCENE-1749.patch,
> LUCENE-1749.patch
>
>
> FieldCache should expose an Expert level API for runtime introspection of the
> FieldCache to provide info about what is in the FieldCache at any given
> moment. We should also provide utility methods for sanity checking that the
> FieldCache doesn't contain anything "odd"...
> * entries for the same reader/field with different types/parsers
> * entries for the same field/type/parser in a reader and it's subreader(s)
> * etc...
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