> The merge program doesn't care what the name of the folder is. It  
> cares it
> should be in a certain structure.
>
> So if we assume you have a folder named indexes, the program wants  
> that each
> folder inside indexes (represents a previous run of index) should  
> have a
> Lucene index in it (it looks for a folder name segments).


Thanks Gal for the explanation. It makes sense.

What doesn't though is that

bin/nutch merge crawl/index crawl/index_1 crawl/index_2 crawl/index

(i.e. merging three indexes including the previously merged one) will  
not generate the part-00000 in crawl/index, it just dumps the merged  
Lucene index directly into crawl/index. So then the next time I do a  
crawl merge I have to manually move the crawl/index/* to crawl/index/ 
part-00000/.

But knowing this at least is helpful so I can update my scripts!

-Brian



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