CassandraMetriccassandra_key_cache_hit_rate
Number of entries in the key cacheDimensions:None
Interface Metrics (2)
Datadog
Dimensions:None
Sources
Knowledge Base (3 documents, 0 chunks)
guideCritical Cassandra Performance Metrics to Monitor - Sematext2324 wordsscore: 0.95This comprehensive guide explains critical Cassandra performance metrics to monitor, covering node availability, compaction metrics, read/write performance, table-level metrics including partition size and tombstones, and cache utilization. It provides context on Cassandra architecture and explains why each metric category matters for cluster health and performance.
documentationMonitoring and adjusting caching253 wordsscore: 0.85This documentation page provides guidance on monitoring and adjusting Cassandra's caching mechanisms using nodetool commands. It explains how to interpret cache metrics from nodetool info output, including hit rates, capacity, and size metrics for key cache, row cache, and counter cache.
troubleshootingflush_largest_memtables_at messages in 7.42262 wordsscore: 0.72This is a mailing list discussion about troubleshooting Cassandra 7.4 heap memory usage and memtable flushing warnings. The thread covers analyzing memtable flush behavior, key cache hit rates, and heap utilization through nodetool commands and cfstats output.
Related Insights (2)
Cache Miss Rate Amplifying Read Latencywarning
When cassandra_key_cache_hit_rate drops significantly below historical baseline, reads bypass cache and hit disk directly, multiplying I/O load and latency. This often correlates with workload changes or cache size misconfiguration.
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Cache Hit Rate Collapse Amplifying Disk IOwarning
Low cassandra_key_cache_hit_rate forces Cassandra to read row locations from disk on every query instead of memory, multiplying disk IO. Degraded cache performance appears as read latency increases without corresponding write load changes.
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