Access the UI and ports - E-MapReduce - Alibaba Cloud Documentation Center

This topic describes the ports on frontends (FEs) and backends (BEs) and how to access the ports.

FE


Port name	Default port number	Communication direction	Description
http_port	8030 Note This port applies to clusters of EMR V5.8.0 and EMR V3.42.0, and clusters of a minor version earlier than EMR V5.8.0 or EMR V3.42.0. 18030 Note This port applies to clusters of EMR V5.9.0 or a later minor version and clusters of EMR V3.43.0 or a later minor version.	FE <--> User	The HTTP server port on the FE.
rpc_port	9020	BE --> FE FE <--> FE	The Thrift server port on the FE.
query_port	9030	FE <--> User	The MySQL server port on the FE.

Enter FE_IP:http_port in the address bar of a browser to access the FE UI.

Note In most cases, FE_IP is a public IP address.


Port name	Default port number	Communication direction	Description
be_port	9060	FE --> BE	The Thrift server port on the BE. This port is used to receive requests from an FE.
webserver_port	8040 Note This port applies to clusters of EMR V5.8.0 and EMR V3.42.0, and clusters of a minor version earlier than EMR V5.8.0 or EMR V3.42.0. 18040 Note This port applies to clusters of EMR V5.9.0 or a later minor version and clusters of EMR V3.43.0 or a later minor version.	BE <--> BE	The HTTP server port on the BE.
heartbeat_service_port	9050	FE --> BE	The heartbeat service port for the Thrift server on the BE. This port is used to receive heartbeat messages from an FE.
brpc_port	8060	FE <--> BE BE <--> BE	The better Remote Procedure Call (bRPC) port on the BE. This port is used to communicate with another BE.

You can run the curl http://be_ip:webserver_port/metrics command to obtain information about metrics.

Note In most cases, be_ip is an internal IP address.