Major Description
While working on a project where I have to index a huge number of URLs I encountered an issue with the link inversion step of the crawling script. A while ago Ian Lopata stumbled upon the same issue as described here: http://lucene.472066.n3.nabble.com/InvertLinks-Performance-Nutch-1-6-td4183004.html
I am running the invertlinks step in my Nutch 1.6 based crawl process on a
single node. I run invertlinks only because I need the Inlinks in the
indexer step so as to store them with the document. I do not need the
anchor text and I am not scoring. I am finding that invertlinks (and more
specifically the merge of the linkdb) takes a long time - about 30 minutes
for a crawl of around 150K documents. I am looking for ways that I might
shorten this processing time. Any suggestions?
Back then wastl-nagel suggested turning off the normalizers and filters during the inversion step which speeds up the process a bunch.
In my case however I kind of depend on those so this is no real solution.
I opened this issue here in order to get some feedback on how we could improve things in a crawl script and speed up the process.
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