To your and Brock’s questions, my answers are as below.

What client are you using to benchmark? You might also be bound by the client 
My Answer: we are using many force testing machines to test the highest TPS on 
kudu. Our testing client should have enough ability.
I'd verify that the new nodes are assigned tablets? Along with considering an 
increase the number of partitions on the table being tested.
My Answer: Yes, with machines added each time, I created a new table for 
testing so that tablets can be assigned to new machines. For the partition 
strategy, I am using 2-level partitions: the first level is a range partition 
by date(I use 3 partitions here, meaning 3-days data), and the second level is 
a hash partition(I use 3, 6, and 9 respectively for the clusters with 3, 6, and 
9 tservers).

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