High CPU usage after creating MultithreadedTableWriter without any workload

[welaunchcn]

standalone 2.00.11 server running on ubuntu 22.04
connected with dolphindb_csharpapi 1.30.21

var writer = new MultithreadedTableWriter("localhost", 8848, "admin", "123456", "dfs://xxx", "yyy", false, partitionCol: "zzz");
Thread.Sleep(60 * 1000);

after running the code above, all 8 cores are at 75%