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Cassandra CassandraSchemaDisagreement

Nodes in the cluster have differing schema versions.

Understanding Apache Cassandra

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 performance and reliability.

Symptom: CassandraSchemaDisagreement

The CassandraSchemaDisagreement alert in Prometheus indicates that there is a schema disagreement among the nodes in your Cassandra cluster. This means that different nodes have different versions of the schema, which can lead to inconsistencies and potential data integrity issues.

Details About the CassandraSchemaDisagreement Alert

Schema disagreements occur when the schema versions across nodes do not match. This can happen due to network issues, failed schema updates, or nodes being down during schema changes. When this alert is triggered, it is crucial to address it promptly to maintain the integrity and consistency of your data.

Why Schema Disagreements Matter

Schema disagreements can lead to data inconsistencies, application errors, and can complicate future schema changes. It is essential to ensure that all nodes in the cluster have a consistent view of the schema.

Steps to Fix the CassandraSchemaDisagreement Alert

1. Identify Nodes with Schema Disagreement

First, identify which nodes have differing schema versions. You can use the following command to check the schema versions across nodes:

nodetool describecluster

This command will show the schema versions and the nodes associated with each version.

2. Resolve Schema Conflicts

Once you have identified the nodes with differing schema versions, you need to resolve the conflicts. This may involve:

  • Restarting nodes that are out of sync.
  • Ensuring that all nodes are up and connected to the cluster.
  • Manually updating the schema on nodes that have not received the latest updates.

3. Ensure All Nodes Are Updated

Make sure that all nodes are running the same version of Cassandra and have applied the same schema updates. You can use the following command to ensure all nodes are updated:

nodetool repair

This command helps synchronize data across nodes and can help resolve schema disagreements.

4. Restart Nodes if Necessary

If schema disagreements persist, consider restarting the affected nodes. This can help them rejoin the cluster with the correct schema version.

Additional Resources

For more detailed information on handling schema disagreements in Cassandra, you can refer to the official Apache Cassandra Documentation. Additionally, the Prometheus Documentation provides insights into setting up and managing alerts effectively.

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