I've built up 2 es testing clusters, one 6.3.2 and the other 6.6.1, both on identical hardware(16c64g+ssd).
6.6.1 runs on jdk11+g1gc
6.3.2 runs on jdk8 + cmsgc
After running "geonames" benchmark by esrally, I see a drop down
throughput in "country_agg_uncached" with 8% in 6.6.1 cluster, while other task results like term/phrase/script are nearly the same.
Cpu both reached 100% while running "country_agg_uncached" task in each cluster
Is there any implemetation change with aggregation happened? I've got confused by this performance drop down.