pd-ctl看下这几个参数现在的大小是多少，先把这个适当调整
region-schedule-limit
replica-schedule-limit
leader-schedule-limit
max-pending-peer-count
max-snapshot-count
merge-schedule-limit
pd-ctl看下这几个参数现在的大小是多少，先把这个适当调整
region-schedule-limit
replica-schedule-limit
leader-schedule-limit
max-pending-peer-count
max-snapshot-count
merge-schedule-limit