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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 known for its linear scalability and fault tolerance on commodity hardware or cloud infrastructure, making it an ideal platform for mission-critical data.
The CassandraHintsDeliveryLatencyHigh alert in Prometheus indicates that the hint delivery process in Cassandra is experiencing higher latency than expected. This can be a sign of underlying network or node issues that need immediate attention.
In Cassandra, hints are used to ensure eventual consistency. When a node is down or unreachable, other nodes store hints for the downed node. Once the node is back online, these hints are delivered to it. The CassandraHintsDeliveryLatencyHigh alert is triggered when the time taken to deliver these hints exceeds a predefined threshold. This could lead to delayed consistency and potential data discrepancies.
Ensure that all nodes in the Cassandra cluster can communicate with each other. Use tools like ping
or traceroute
to verify network paths:
ping
traceroute
If there are any connectivity issues, work with your network team to resolve them.
Check the load on each node to ensure they are not overwhelmed. Use the nodetool status
command to get an overview of the cluster:
nodetool status
Look for nodes with high load or that are in a DOWN
state. Consider redistributing the load or adding more nodes to the cluster if necessary.
Ensure that your Cassandra configuration is optimized for your workload. Check the cassandra.yaml
file for settings related to hint delivery, such as hinted_handoff_enabled
and max_hint_window_in_ms
. Adjust these settings based on your cluster's needs.
Use nodetool
to monitor hint delivery progress:
nodetool netstats
This command provides information about the number of hints being delivered and any potential bottlenecks.
For more detailed information on managing Cassandra and troubleshooting common issues, refer to the official Apache Cassandra Documentation. You can also explore the Prometheus Documentation for more insights into setting up and managing alerts.
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