Why architecture matters here

Replication failures come from wrong CL + cross-DC misconfig. Architecture matters because RF + strategy + CL compose.

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The architecture: every piece explained

The top strip is topology. Replication factor. SimpleStrategy. NetworkTopologyStrategy. Consistency level.

The middle row is specific CLs. LOCAL_QUORUM. EACH_QUORUM. SERIAL / LOCAL_SERIAL. Hinted handoff.

The lower rows are ops. Read repair. Metrics. Ops — DC failover + repair + capacity.

Cassandra replication — RF + consistency level + NTS + LOCAL_QUORUM + cross-DChow data is copied and how much you waitReplication factorN copies per DCSimpleStrategysingle DCNetworkTopologyStrategymulti-DC awareConsistency levelANY / ONE / QUORUM / ALLLOCAL_QUORUMsame DC quorumEACH_QUORUMall DCs quorumSERIAL / LOCAL_SERIALPaxosHinted handofftemp store on failureRead repaircross-DC read consistencyMetricslatency + inconsistencyOps — DC failover + repair + capacitymatchcrossatomicbufferreconcilewatchwatchoperateoperate
Cassandra replication + consistency picking.
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End-to-end flow

End-to-end: multi-DC cluster with RF=3 per DC. LOCAL_QUORUM used for reads and writes. Failing node in DC1; hinted handoff buffers; recovered node catches up. Cross-DC read repair reconciles occasionally divergent replicas.