>For random-lru and random-lru-2, algorithm randomly selects 5 indexes. Why
5? 
well,  I don't know about how this number has been chosen. The only I can
say it works fine.

>Can I change this number? 
there's no way to configure it.

>And we evict the index which |last_1 - last_2| is max? Am i correct? 
Nope, Random LRU2 tracks two last recently used timestamps and takes
MIN(timestamp1, timestamp2) for further comparing. 

>What is the best advantages over random-lru to random-lru-2(vica-verse)? 
see the doc about this, it explicitly explains this:
https://apacheignite.readme.io/docs/evictions#section-random-2-lru



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