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Tools / Apache HertzBeat Interview Questions

What is the difference between the warehouse's real-time and history store?

The hertzbeat-warehouse module keeps two distinct tiers of storage rather than a single store, because dashboards and trend charts need different access patterns.

Real-time storeHistory store
Holds only the latest snapshot per metric.Holds the full time-series of past values.
Optimized for fast "current value" reads.Backed by a configured TSDB like VictoriaMetrics or IoTDB.
Always available, no extra setup.Only populated if a TSDB is configured.

This split is why a dashboard's live status tile can update instantly while historical trend charts depend entirely on whether a TSDB was configured.

The real-time store is optimized for:
The history store is only populated when:

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