frontends
Name
frontends
description
表函数,生成 frontends 临时表,可以查看当前 doris 集群中的 FE 节点信息。
该函数用于 from 子句中。
syntax
frontends()
frontends() 表结构:
mysql> desc function frontends();
+-------------------+------+------+-------+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------------------+------+------+-------+---------+-------+
| Name | TEXT | No | false | NULL | NONE |
| Host | TEXT | No | false | NULL | NONE |
| EditLogPort | TEXT | No | false | NULL | NONE |
| HttpPort | TEXT | No | false | NULL | NONE |
| QueryPort | TEXT | No | false | NULL | NONE |
| RpcPort | TEXT | No | false | NULL | NONE |
| ArrowFlightSqlPort| TEXT | No | false | NULL | NONE |
| Role | TEXT | No | false | NULL | NONE |
| IsMaster | TEXT | No | false | NULL | NONE |
| ClusterId | TEXT | No | false | NULL | NONE |
| Join | TEXT | No | false | NULL | NONE |
| Alive | TEXT | No | false | NULL | NONE |
| ReplayedJournalId | TEXT | No | false | NULL | NONE |
| LastHeartbeat | TEXT | No | false | NULL | NONE |
| IsHelper | TEXT | No | false | NULL | NONE |
| ErrMsg | TEXT | No | false | NULL | NONE |
| Version | TEXT | No | false | NULL | NONE |
| CurrentConnected | TEXT | No | false | NULL | NONE |
+-------------------+------+------+-------+---------+-------+
17 rows in set (0.022 sec)
frontends()
tvf 展示出来的信息基本与 show frontends
语句展示出的信息一致,但是 frontends()
tvf 的各个字段类型更加明确,且可以利用 tvf 生成的表去做过滤、join 等操作。
对 frontends()
tvf 信息展示进行了鉴权,与 show frontends
行为保持一致,要求用户具有 ADMIN/OPERATOR 权限。
example
mysql> select * from frontends()\G
*************************** 1. row ***************************
Name: fe_5fa8bf19_fd6b_45cb_89c5_25a5ebc45582
IP: 10.xx.xx.14
EditLogPort: 9013
HttpPort: 8034
QueryPort: 9033
RpcPort: 9023
ArrowFlightSqlPort: 9040
Role: FOLLOWER
IsMaster: true
ClusterId: 1258341841
Join: true
Alive: true
ReplayedJournalId: 186
LastHeartbeat: 2023-06-15 16:53:12
IsHelper: true
ErrMsg:
Version: doris-0.0.0-trunk-4b18cde0c7
CurrentConnected: Yes
1 row in set (0.060 sec)
keywords
frontends