[Yanel-dev] Default Index (2 directories)

[Michael Wechner]

Hi Balz

On 4/1/11 6:55 AM, Balz Schreier wrote:
> Hi Michael,
>
> can you explain, why there are per default 2 index directories? 
> fulltext and properties?

I don't remember exactly why we did it this way, but either I/we 
misunderstood Lucene or
it was because of backwards compatibility reasons, but I agree it's not 
necessary to have two indexes.


>
> as of my understanding, you actually only require 1 single index which 
> stores everything (fulltext is nothing else than a property called 
> "_FULLTEXT", right? So we would need just one index.


yes and the LuceneIndexerV2 is doing this, whereas it still maintains 
the properties index, but just
for backwards compatibility reasons.

>
> tempo/cache/search-index/fulltext
> tempo/cache/search-index/properties
>
> Both directories contain segment files so both are somehow used by 
> Yanel, but only 1 should actually be used.

Re searching we have to introduce a LuceneSearcherV2 which access also 
for searchProperty(..) the "fulltext" index.

>
> I just had a productive issue where the LOCK file was not removed 
> anymore from the index in the "properties" directory and I guess there 
> are still some sections in the code which are not yet fully 
> synchronized (LuceneIndexer). Under any circumstances, the LOCK file 
> must get removed again, whatever happens during writing into the 
> index... I'll have a closer look at the code again today.

Thanks

Michael


>
> Cheers
> Balz

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