{"type":"excalidraw","version":2,"source":"https://AwesomeSystemDesign.dev","elements":[{"angle":0,"strokeColor":"#628572","backgroundColor":"#edf5ee","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-1"],"frameId":null,"roundness":null,"boundElements":[{"type":"text","id":"shape-1"}],"updated":0,"link":null,"locked":false,"id":"shape-0","type":"rectangle","seed":41,"x":30,"y":30,"width":420,"height":68,"customData":{"revealStep":1}},{"angle":0,"strokeColor":"#394557","backgroundColor":"transparent","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-1"],"frameId":null,"roundness":null,"boundElements":null,"updated":0,"link":null,"locked":false,"id":"shape-1","type":"text","seed":114,"x":50,"y":52.3,"width":380,"height":23.400000000000002,"fontSize":18,"fontFamily":1,"text":"Partition 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key is present:\npartition = hash(key) % num_partitions\n→ Same key always goes to same partition → ordering guaranteed\n→ e.g., all events for user-123 go to partition 7","originalText":"If key is present:\npartition = hash(key) % num_partitions\n→ Same key always goes to same partition → ordering guaranteed\n→ e.g., all events for user-123 go to partition 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key is null:\nSticky partitioner (Kafka 2.4+):\n→ Fill one batch for a partition, then rotate\n→ Better batching than pure round-robin","originalText":"If key is null:\nSticky partitioner (Kafka 2.4+):\n→ Fill one batch for a partition, then rotate\n→ Better batching than pure 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partitioner:\n→ Application can implement custom logic\n→ e.g., route by region, priority, message type","originalText":"Custom partitioner:\n→ Application can implement custom logic\n→ e.g., route by region, priority, message type","textAlign":"left","verticalAlign":"middle","containerId":"shape-6","lineHeight":1.3,"autoResize":false,"customData":{"revealStep":4}}],"appState":{"viewBackgroundColor":"#fbfbf8","gridSize":null},"files":{}}