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PartitioningData Systems

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• fixed-partition-count / dynamic partitioningpre-split many / split-on-growth
• global (term-partitioned) indexindex split by term (cross-partition writes)
• hot spot / hot keyan overloaded partition / single key
• local (document-partitioned) indexeach partition indexes its own docs (scatter/gather reads)
• MPPmassively parallel processing (analytic queries)
• partition / sharda slice of the data
• range vs hash partitioningsorted intervals vs scramble
• rebalancingredistribute partitions across nodes
• request routingfind the node for a key
• secondary indexlookup by a non-key field
• skewuneven distribution
• ZooKeepercoordination service holding the map