Java

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How are consumers distributed across partitions: does each consumer connect to each partition or not?

Did the application connect directly to PostgreSQL or through an intermediate component?

What are the options to avoid issues with concurrent access when working with HashMap?

What was the volume of concurrent requests and why was it critical for PostgreSQL?

Why couldn't you just scale the synchronous API, add application instances, or database capacity instead of Kafka?

Why and how did you switch to Kafka for asynchronous processing and load reduction?

Why did you increase the connection pool size under high load and how is this different from increasing the total number of requests?

Are you familiar with the outstaffing model?

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