CassandraStorageExceptions

CassandraStorageExceptions #

Something is going wrong with cassandra storage - {{ $labels.cassandra_cluster }}

Alert Rule
alert: CassandraStorageExceptions
annotations:
  description: |-
    Something is going wrong with cassandra storage - {{ $labels.cassandra_cluster }}
      VALUE = {{ $value }}
      LABELS = {{ $labels }}    
  runbook: https://srerun.github.io/prometheus-alerts/runbooks/instaclustr-cassandra-exporter/cassandrastorageexceptions/
  summary: Cassandra storage exceptions (instance {{ $labels.instance }})
expr: changes(cassandra_storage_exceptions_total[1m]) > 1
for: 0m
labels:
  severity: critical

Here is a runbook for the CassandraStorageExceptions alert:

Meaning #

The CassandraStorageExceptions alert is triggered when there is an increase in Cassandra storage exceptions over a 1-minute period. This indicates that something is going wrong with Cassandra storage, which can lead to data inconsistency, unavailability, or even complete cluster failure.

Impact #

The impact of this alert can be severe, as it may cause:

  • Data loss or corruption
  • Decreased performance and availability of Cassandra cluster
  • Increased latency and timeouts for applications dependent on Cassandra
  • Potential cascading failures in upstream services

Diagnosis #

To diagnose the root cause of the CassandraStorageExceptions alert, follow these steps:

  1. Check the Cassandra cluster logs for errors related to storage exceptions
  2. Verify that the Cassandra node(s) are running and healthy
  3. Check disk usage and free space on Cassandra nodes
  4. Verify that there are no network connectivity issues between Cassandra nodes
  5. Check for any recent changes to Cassandra configuration or schema
  6. Review Cassandra metrics, such as disk usage, read/write latency, and error rates, to identify any trends or patterns

Mitigation #

To mitigate the CassandraStorageExceptions alert, follow these steps:

  1. Investigate and resolve the root cause of the storage exceptions
  2. Restart the Cassandra node(s) if necessary
  3. Free up disk space on Cassandra nodes if disk usage is high
  4. Adjust Cassandra configuration or schema to prevent storage exceptions
  5. Monitor Cassandra metrics and logs closely to ensure the issue is fully resolved
  6. Consider implementing additional monitoring and alerting for Cassandra storage exceptions to catch issues earlier in the future
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