BACKENDS | VeloDB

`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

POSEXPLODE CATALOGS