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Metrics for SOLR index rebuilds

Question asked by paul.price on Jun 20, 2014
I was looking around for metrics on how long a SOLR index rebuild should take. We have ~ 430,000 docs in our repository. It took about 12 hours to rebuild after a version upgrade (4.1.7 -> 4.1.8) What have others experienced? Is there a guide for us to estimate future rebuilds?

Does the SOLR rebuilds improve in 4.2 or should we expect a similar time when we do that upgrade in a few months?

Does the index rebuild take advantage of the all the available CPU cores, or is it single threaded?

Our hardware is quite robust, with 8 cores and 256GB memory, attached to SAN, on RHEL.