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Tag: Replication

Replication failures, lag, or divergence in stateful systems.

IDTitleDescriptionCategoryTechnologyTags
CRE-2025-0020
High
Impact: 10/10
Mitigation: 6/10
Self-hosted PostgreSQL HA: WAL Streaming & HA Controller Crisis (Replication Slot Loss, Disk Full, Etcd Quorum Failure)Detects high-severity failures in self-hosted PostgreSQL high-availability clusters managed by Patroni, Zalando, or similar HA controllers. This rule targets catastrophic conditions that break replication or cluster consensus: - WAL streaming failures due to missing replication slots (usually after disk full or crash events) - Persistent errors resolving HA controller endpoints (etcd/consul) and loss of HA controller quorum - Disk saturation leading to WAL write errors and replication breakagePostgreSQL High AvailabilitypostgresqlHigh AvailabilityPatroniZalandoEtcdReplicationWALStorageQuorumCrashData LossTimeout
CRE-2025-0070
Critical
Impact: 10/10
Mitigation: 6/10
Kafka Under-Replicated Partitions CrisisCritical Kafka cluster degradation detected: Multiple partitions have lost replicas due to broker failure, resulting in an under-replicated state. This pattern indicates a broker has become unavailable, causing partition leadership changes and In-Sync Replica (ISR) shrinkage across multiple topics.Message Queue ProblemskafkaKafkaReplicationData LossHigh AvailabilityBroker FailureCluster Degradation
CRE-2025-0140
Medium
Impact: 6/10
Mitigation: 5/10
Supabase Self-Hosted: Realtime Service Crash Due to Invalid ConfigurationDetects when Supabase Realtime service fails to start or crashes due to invalid configuration parameters. This affects WebSocket connections, real-time subscriptions, and live data streaming capabilities. Common issues include invalid replication modes, missing database permissions, or incorrect environment variables.Realtime ProblemsrealtimeSupabaseRealtimeConfigurationReplicationConnectionSelf-HostedConfiguration FailurePublic
CRE-2025-0175
Critical
Impact: 8/10
Mitigation: 6/10
Redis Master-Replica Synchronization FailureDetects failures in Redis master-replica synchronization including broken replication links, sync timeouts, and full resync loops. These issues compromise data consistency and high availability in Redis deployments.In-Memory Database ProblemsredisRedisReplicationMaster-ReplicaSyncPartial Sync
CRE-2025-0178
Critical
Impact: 5/10
Mitigation: 9/10
Redis Read-Only Replica Write Attempt ErrorDetects attempts to perform write operations on Redis read-only replicas. This error indicates application misconfiguration where clients are incorrectly routing write commands to replica instances instead of the master.In-Memory Database ProblemsredisRedisREADONLYReplicaReplicationWrite Error