使用DECOMMISSION命令下线BE后，其他BE节点的DataUsedCapacity增大，下线节点的DataUsedCapacity降低，TrashUsedCapacity增大，但是三个BE节点的TabletNum没有变化。
ALTER SYSTEM DECOMMISSION BACKEND "xxx.xxx.xxx.xxx:xxxx";
+-----------+---------------+---------------+--------+----------+----------+--------------------+---------------------+---------------------+-------+----------------------+-----------+------------------+--------------------+---------------+---------------+---------+----------------+--------------------+--------------------------+--------+-----------------------------+-------------------------------------------------------------------------------------------------------------------------------+-------------------------+----------+
| BackendId | Host | HeartbeatPort | BePort | HttpPort | BrpcPort | ArrowFlightSqlPort | LastStartTime | LastHeartbeat | Alive | SystemDecommissioned | TabletNum | DataUsedCapacity | TrashUsedCapcacity | AvailCapacity | TotalCapacity | UsedPct | MaxDiskUsedPct | RemoteUsedCapacity | Tag | ErrMsg | Version | Status | HeartbeatFailureCounter | NodeRole |
+-----------+---------------+---------------+--------+----------+----------+--------------------+---------------------+---------------------+-------+----------------------+-----------+------------------+--------------------+---------------+---------------+---------+----------------+--------------------+--------------------------+--------+-----------------------------+-------------------------------------------------------------------------------------------------------------------------------+-------------------------+----------+
| 450232 | 172.16.128.95 | 9051 | 9060 | 8041 | 8060 | -1 | 2024-04-09 12:00:22 | 2024-04-09 15:46:08 | true | false | 26186 | 157.870 GB | 5.486 GB | 8.141 TB | 10.744 TB | 24.23 % | 24.49 % | 0.000 | {"location" : "default"} | | doris-2.1.1-rc05-9f2520537f | {"lastSuccessReportTabletsTime":"2024-04-09 15:45:28","lastStreamLoadTime":-1,"isQueryDisabled":false,"isLoadDisabled":false} | 0 | mix |
| 326603 | 172.16.128.96 | 9051 | 9060 | 8041 | 8060 | -1 | 2024-04-09 11:43:59 | 2024-04-09 15:46:08 | true | true | 24164 | 79.946 MB | 70.438 GB | 7.364 TB | 10.744 TB | 31.46 % | 38.58 % | 0.000 | {"location" : "default"} | | doris-2.1.1-rc05-9f2520537f | {"lastSuccessReportTabletsTime":"2024-04-09 15:45:49","lastStreamLoadTime":-1,"isQueryDisabled":false,"isLoadDisabled":false} | 0 | mix |
| 4178979 | 172.16.128.97 | 9051 | 9060 | 8041 | 8060 | -1 | 2024-04-09 14:03:40 | 2024-04-09 15:46:08 | true | false | 21859 | 66.786 GB | 3.659 MB | 7.458 TB | 10.744 TB | 30.58 % | 47.79 % | 0.000 | {"location" : "default"} | | doris-2.1.1-rc05-9f2520537f | {"lastSuccessReportTabletsTime":"2024-04-09 15:45:25","lastStreamLoadTime":-1,"isQueryDisabled":false,"isLoadDisabled":false} | 0 | mix |
+-----------+---------------+---------------+--------+----------+----------+--------------------+---------------------+---------------------+-------+----------------------+-----------+------------------+--------------------+---------------+---------------+---------+----------------+--------------------+--------------------------+--------+-----------------------------+-------------------------------------------------------------------------------------------------------------------------------+-------------------------+----------+
