CassandraMetriccassandra_thread_pool_count_blocked_tasks
Total number of tasks that have been blocked due to queue saturationDimensions:None
Available on:Native (1)
Interface Metrics (1)
Native
Total number of tasks that have been blocked due to queue saturation
Dimensions:None
Related Insights (2)
Thread Pool Saturation Causing Backpressurewarning
When Cassandra's internal thread pools (read, mutation, request, compaction) become saturated with blocked tasks, new requests queue up or fail despite available system CPU. This creates latency spikes before visible service degradation.
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Threadpool Saturation Blocking New Requestswarning
Cassandra's SEDA architecture relies on threadpools for async processing. When cassandra_thread_pool_count_blocked_tasks or cassandra_thread_pool_currently_blocked_tasks accumulate, requests queue waiting for threads, causing latency spikes that don't correlate with CPU/disk saturation.
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