Stern emphasized that while horizontal scaling by adding nodes can improve performance, the challenges of balancing workloads due to uneven shard distribution can lead to inefficiencies and increased costs.
He pointed out that vertical scaling, while helpful to address disk constraints, lacks flexibility in cloud environments and does not adequately address the underlying issues of fluctuating workloads.
Stern recommended 'oversharding' as a strategy, which involves creating more shards than currently necessary to enable better resource distribution during periods of fluctuating workloads.
Ultimately, Amitai Stern's insights highlight the complexity of managing OpenSearch clusters efficiently and cost-effectively, underlining the importance of sound architecture and strategic planning.
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