[nosql] Cassandra port usage - how are the ports used?

When experimenting with Cassandra I've observed that Cassandra listens to the following ports:

• TCP *:8080
• TCP *:8888
• TCP *:57311
• TCP *:57312
• TCP 127.0.0.1:7000
• TCP 127.0.0.1:9160
• UDP 127.0.0.1:700

How does Cassandra use each of the ports listed?

Ports 57311 and 57312 are randomly assigned ports used for RMI communication. These ports change each time Cassandra starts up, but need to be open in the firewall, along with 8080/7199 (depending on version), to allow for remote JMX access. Something that doesn't appear to be particularly well documented, but has tripped me up in the past.

In addition to the above answers, as part of configuring your firewall, if you are using SSH then use port 22.

JMX now uses port 7199 instead of port 8080 (as of Cassandra 0.8.xx).

This is configurable in your cassandra-env.sh file, but the default is 7199.

8080 - JMX (remote)

8888 - Remote debugger (removed in 0.6.0)

7000 - Used internal by Cassandra
(7001 - Obsolete, removed in 0.6.0. Used for membership communication, aka gossip)

9160 - Thrift client API

Cassandra FAQ What ports does Cassandra use?

For Apache Cassandra 2.0 you need to take into account the following TCP ports: (See EC2 security group configuration and Apache Cassandra FAQ)

Cassandra

• 7199 JMX monitoring port
• 1024 - 65355 Random port required by JMX. Starting with Java 7u4 a specific port can be specified using the com.sun.management.jmxremote.rmi.port property.
• 7000 Inter-node cluster
• 7001 SSL inter-node cluster
• 9042 CQL Native Transport Port
• 9160 Thrift

DataStax OpsCenter

• 61620 opscenterd daemon
• 61621 Agent
• 8888 Website

Architecture

A possible architecture with Cassandra + OpsCenter on EC2 could look like this:

I resolved issue using below steps :

1. Stop cassandara services

   sudo su -
   systemctl stop datastax-agent
   systemctl stop opscenterd
   systemctl stop app-dse
   

2. Take backup and Change port from 9042 to 9035

   cp /opt/dse/resources/cassandra/conf/cassandra.yaml /opt/dse/resources/cassandra/conf/bkp_cassandra.yaml
   Vi /opt/dse/resources/cassandra/conf/cassandra.yaml
   native_transport_port: 9035
   

3. Start Cassandra services

   systemctl start datastax-agent
   systemctl start opscenterd
   systemctl start app-dse
   

4. create cqlshrc file.

   vi  /root/.cassandra/cqlshrc
   
   [connection]
   hostname = 198.168.1.100
   port = 9035
   

Thanks, Mahesh