Circuit Breaker Trip Preventing OOM
warningreliabilityUpdated Feb 6, 2026
Circuit breakers trip (CB_TrippedEvents increases) when CB_EstimatedSize approaches CB_ConfiguredSize, preventing out-of-memory errors but causing request failures. Multiple breaker types protect different memory pools.
How to detect:
Monitor CB_TrippedEvents for any circuit breaker type (request, fielddata, in-flight requests, etc.). Track CB_EstimatedSize approaching CB_ConfiguredSize thresholds. Correlate with Heap_Used increases and specific operation types causing breaker trips.
Recommended action:
Identify which circuit breaker is tripping most frequently. For request breaker: reduce query result sizes. For fielddata: limit fielddata usage or increase cache size. For in-flight: reduce concurrent requests. Consider increasing heap size or scaling cluster horizontally.