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ScyllaDB Docs ScyllaDB Monitoring Using Scylla Monitoring Stack Scylla Monitoring Stack Advisor Some operation failed due to unsatisfied consistency level

Some operation failed due to unsatisfied consistency levelΒΆ

ScyllaDB uses data replication, which means that a query is sent to a coordinator node sends the query to the replica nodes (the nodes that hold and persist the replicated data). The coordinator collects the replies and returns an answer. A query Consistency Level, determines the number of replicas that must reply before the coordinator returns an answer.

For example, if the data is replicated to 3 nodes (AKA replication factor 3) and the Consistency Level is quorum, the coordinator will wait for 2 replies before returning the answer.

When one or more nodes are down or unreachable, the Coordinator may fail with a Consistency Level Error because it cannot reach the required consistency level.

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Last updated on 19 March 2023.
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