TrackFTS0003

Users Keep Getting Logged Out

Medium

Problem

Paradox Shop's four application servers store sessions in local memory. The load balancer sends later requests to whichever server is least busy, so users are logged out when a request reaches a server that does not own their session. Repair routing without shrinking or replacing the fleet.

Required components

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Additional components

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Current Production Metrics

Snapshot of the system before any changes.

Traffic

1,200 RPS

Monthly cost

$1,500

Worst server

App Server 1 · 70%

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100%

$0 / $2,000