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Druid architecture (Historical Nodes (load and serve the immutable blocks…
Druid architecture
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Broker nodes
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In the event of a total Zookeeper outage, data is still queryable. If broker nodes are unable to communicate to Zookeeper, they use their last known view of the cluster and continue to forward queries to real-time and historical nodes. Broker nodes make the assump-tion that the structure of the cluster is the same as it was before the outage
Coordinator nodes
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The coordinator nodes load a set of rules from a rule table in the MySQL database.
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