About quick start issue

[YijianLiu]

When I run ./run_dist_server_mode_fs_tracker.sh to test, result is shown below: Client 0 started. [2022-12-04 17:22:05.842047] Server started. [2022-12-04 17:22:05.842530] Server started. Client 1 started. Client 2 started. Then it will always wait here and can't continue? I find the question is the code in function "test_node_iterate(g)" and it will wait on "ds = gl.Dataset(query)", what's the problem and I don't know how to solve this.