Any thoughts regarding the subject? I hope FieldCache doesn't use more than
6 bytes per document-field instance... I am too lazy to research Lucene
source code, I hope someone can provide exact answer... Thanks
> Subject: Lucene FieldCache memory requirements
>
> Hi,
>
>
> Can anyone confirm Lucene FieldCache memory requirements? I have 100
> millions docs with non-tokenized field "country" (10 different countries);
I
> expect it requires array of ("int", "long"), size of array 100,000,000,
> without any impact of "country" field length;
>
> it requires 600,000,000 bytes: "int" is pointer to document (Lucene
document
> ID), and "long" is pointer to String value...
>
> Am I right, is it 600Mb just for this "country" (indexed, non-tokenized,
> non-boolean) field and 100 millions docs? I need to calculate exact
minimum RAM
> requirements...
>
> I believe it shouldn't depend on cardinality (distribution) of field...
>
> Thanks,
> Fuad
>
>
>
>
