Apache Cassandra is a highly scalable, distributed NoSQL database designed to handle large amounts of data across many commodity servers, providing high availability with no single point of failure. It is widely used for its ability to manage large volumes of data with high write and read throughput.
In Cassandra, you might encounter an issue where a node is unable to stream data to another node. This typically occurs during operations such as repair, bootstrap, or when adding new nodes to the cluster. The symptom is often observed as a failure in these operations, potentially accompanied by error messages in the logs indicating streaming failures.
The inability of a node to stream data can be attributed to several root causes, primarily related to network connectivity. Some of the common causes include:
Cassandra uses specific ports for communication between nodes. Ensure that ports such as 7000 (for intra-node communication) and 7001 (for SSL communication) are open and accessible between nodes.
To resolve the issue of a node being unable to stream, follow these steps:
Ensure that the nodes can communicate with each other over the network. Use tools like ping or telnet to check connectivity:
ping node_ip
telnet node_ip 7000
Ensure that there are no firewall rules blocking the necessary ports. You can use iptables or firewalld commands to check and modify firewall settings:
iptables -L -n
firewall-cmd --list-all
Check the cassandra.yaml configuration file to ensure that the listen_address and rpc_address are correctly set to the node's IP address.
After making changes, restart the Cassandra service on the affected nodes:
sudo systemctl restart cassandra
For more detailed information on configuring and troubleshooting Cassandra, consider visiting the following resources:
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