How to handle the issues of node failure and data recovery in Cassandra?

8 months ago

Emily Johnson

2 minutes

When a Cassandra node fails, the usual course of action is to take the following measures for data recovery:

Start a new Cassandra node: in case of a node failure, a new Cassandra node can be started to replace the failed node, ensuring that the replication factor in the cluster still meets the requirements.
Enable the automatic repair feature: Cassandra has an automatic repair feature that can automatically fix data replicas on failed nodes. You can set the parameters for the automatic repair feature in the configuration file to have it automatically repair data after a node failure.
Manually fix a failed node: If the automatic repair function cannot restore the data, you can manually fix the failed node. This process includes starting a new Cassandra node to replace the failed node and manually repairing the data on the failed node using the ‘nodetool repair’ command.
Data backup and recovery: Regularly back up data before node failure, and use the backup data for recovery after node failure. Utilize Cassandra tools such as nodetool snapshot and nodetool restore for backup and recovery operations.

In general, addressing issues with failed Cassandra nodes and data recovery requires promptly identifying node failure and taking appropriate measures to ensure data integrity and reliability. Additionally, regularly backing up data is also an important way to ensure data security.