The parameter bufferSize in the filestore example affects the sizes of Raft logs

Dear all,

I downloaded the latest version of ratis and run the filestore example using the default parameters for the three servers. I tried different bufferSize parameter values for the client. As bufferSize increases from 1024 to 1024*1024, the file size of each closed segmented raft log becomes smaller and smaller. In my thought, the file size of each closed segmented raft log should be equal to 8M, am I right? Why does this phenomenon happen?

The run command for the client is like the following:

BIN=ratis-examples/src/main/bin
PEERS=n0:127.0.0.1:6000,n1:127.0.0.1:6001,n2:127.0.0.1:6002

${BIN}/client.sh filestore loadgen --size 2097152 --numFiles 500 --storage /tmp/ratis/loadgen --numClients 6 --peers ${PEERS} --bufferSize 1024