Hi Mike, It seems that GROUP_BY requires to fetch all dataset into java heap (in order to sort data) and it may lead to long GC pauses. I think that data collocation [1] should improve performance with using GROUP BY.
[1] https://apacheignite.readme.io/docs/affinity-collocation Thanks! -- Sent from: http://apache-ignite-users.70518.x6.nabble.com/
