> On Apr 4, 2017, at 7:38 PM, Muhammad Imad Qureshi > <imadgr...@yahoo.com.INVALID> wrote: > > Hi > I was recently told that ideally the number of shards in a SOLR cluster > should be equal to a power of 2. If this is indeed a best practice, then what > is the rationale behind this recommendation? ThanksImad
I don’t know of any such recommendation. Assuming you are not RAM or disk limited, going to two or three shards won’t help a lot. If those get you out of a bottleneck, you’ll see a difference. I believe that some of the performance of Solr is proportional to the number of distinct terms in the index (the vocabulary). A rule of thumb is the vocabulary is proportional to the square root of the number of terms in the index. Which is often related to the number of documents. With this assumption, four shards gives a 2X speedup. Which has worked for me. wunder Walter Underwood wun...@wunderwood.org http://observer.wunderwood.org/ (my blog)
