Yonik Seeley wrote:
2010/4/30 Koji Sekiguchi <k...@r.email.ne.jp>:
Are Strings that are got via FieldCache.DEFAULT.getStrings( reader,
field ) interned?
Since I have a requirement for having FieldCaches of some
fields in 250M docs index, I'd like to estimate memory
consumed by FieldCache.
By looking at FieldCacheImpl source code, it seems that
field names are interned, but values are not?
Values are not interned, but in a single field cache entry (String[])
the same String object is used for all docs with that same value.
Yeah, you are right. Because I could see the arbitrary two Strings that have
same value were identical (== is true) in String[] gotten by
getStrings() but
I coudn't see explicit intern() for them, I asked. Can you elaborate who
done it?
But... I think StringIndex is more commonly used in both Lucene and
Solr than String[] (sorting, faceting, etc) so double check that it's
not StringIndex you should be looking at.
Yes, I think StringIndex is better than String[] for my requirement in terms
of memory consumption as well (an extreme case, male/female field etc.).
Thank you,
Koji
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