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BACKENDS

backends​

Name​

backends

description​

Table-Value-Function, generate a temporary table named backends. This tvf is used to view the information of BE nodes in the doris cluster.

This function is used in FROM clauses.

syntax​

backends()

The table schema of backends() tvf:

mysql> desc function backends();
+-------------------------+---------+------+-------+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------------------------+---------+------+-------+---------+-------+
| BackendId | BIGINT | No | false | NULL | NONE |
| Host | TEXT | No | false | NULL | NONE |
| HeartbeatPort | INT | No | false | NULL | NONE |
| BePort | INT | No | false | NULL | NONE |
| HttpPort | INT | No | false | NULL | NONE |
| BrpcPort | INT | No | false | NULL | NONE |
| LastStartTime | TEXT | No | false | NULL | NONE |
| LastHeartbeat | TEXT | No | false | NULL | NONE |
| Alive | BOOLEAN | No | false | NULL | NONE |
| SystemDecommissioned | BOOLEAN | No | false | NULL | NONE |
| TabletNum | BIGINT | No | false | NULL | NONE |
| DataUsedCapacity | BIGINT | No | false | NULL | NONE |
| AvailCapacity | BIGINT | No | false | NULL | NONE |
| TotalCapacity | BIGINT | No | false | NULL | NONE |
| UsedPct | DOUBLE | No | false | NULL | NONE |
| MaxDiskUsedPct | DOUBLE | No | false | NULL | NONE |
| RemoteUsedCapacity | BIGINT | No | false | NULL | NONE |
| Tag | TEXT | No | false | NULL | NONE |
| ErrMsg | TEXT | No | false | NULL | NONE |
| Version | TEXT | No | false | NULL | NONE |
| Status | TEXT | No | false | NULL | NONE |
| HeartbeatFailureCounter | INT | No | false | NULL | NONE |
| NodeRole | TEXT | No | false | NULL | NONE |
+-------------------------+---------+------+-------+---------+-------+
23 rows in set (0.002 sec)

The information displayed by the backends tvf is basically consistent with the information displayed by the show backends statement. However, the types of each field in the backends tvf are more specific, and you can use the backends tvf to perform operations such as filtering and joining.

The information displayed by the backends tvf is authenticated, which is consistent with the behavior of show backends, user must have ADMIN/OPERATOR privelege.

example​

mysql> select * from backends()\G
*************************** 1. row ***************************
BackendId: 10002
Host: 10.xx.xx.90
HeartbeatPort: 9053
BePort: 9063
HttpPort: 8043
BrpcPort: 8069
LastStartTime: 2023-06-15 16:51:02
LastHeartbeat: 2023-06-15 17:09:58
Alive: 1
SystemDecommissioned: 0
TabletNum: 21
DataUsedCapacity: 0
AvailCapacity: 5187141550081
TotalCapacity: 7750977622016
UsedPct: 33.077583202570978
MaxDiskUsedPct: 33.077583202583881
RemoteUsedCapacity: 0
Tag: {"location" : "default"}
ErrMsg:
Version: doris-0.0.0-trunk-4b18cde0c7
Status: {"lastSuccessReportTabletsTime":"2023-06-15 17:09:02","lastStreamLoadTime":-1,"isQueryDisabled":false,"isLoadDisabled":false}
HeartbeatFailureCounter: 0
NodeRole: mix
1 row in set (0.038 sec)

keywords​

backends