f0:string f1:int f2:int f3:double
partition key: f1
primary key: f0 f1 f2
bucket key: f2
bucket count: 2

Msgs:
snapshot-1
Add: "Alice", 10, 1, 11.1
Add: "Bob", 10, 0, 12.1
Add: "Emily", 10, 0, 13.1
Add: "Tony", 10, 0, 14.1
Add: "Alex", 10, 0, 16.1
NoCompact

data_split-01
with snapshot-1, partition-10, bucket-0

commit_message-01
with partition-10, bucket-0
with partition-10, bucket-1
