Minimum instance requirements

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Quick reference

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Minimal instance (1 vCPU, 1-2 GB)

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Configuration

MAX_MEMORY_MB=1500
MEMORY_BUFFER_PERCENT=30
PG_POOL_SIZE=5
REDIS_POOL_SIZE=3
DEFAULT_WORKERS_PER_SINK=10

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Small instance (2 vCPU, 4 GB)

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Configuration

MAX_MEMORY_MB=3500
MEMORY_BUFFER_PERCENT=20
PG_POOL_SIZE=10
REDIS_POOL_SIZE=5
DEFAULT_WORKERS_PER_SINK=50

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When to scale

• sequin_ingestion_saturation_percent
• sequin_processing_saturation_percent
• sequin_delivery_saturation_percent

• Processes using >100MB memory
• Message queues with >1000 pending
• Growing ETS tables
• erlang_vm_memory_bytes_total approaching MAX_MEMORY_MB

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Optimization tips

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Batch configuration

# High-latency destinations (webhooks)
batch_size: 50
batch_timeout: 100ms

# Low-latency destinations (Kafka, Redis)
batch_size: 100
batch_timeout: 10ms

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Performance tuning

• Filter specific tables instead of entire schemas
• Use filters to reduce message volume
• Use transforms to reduce message sizes
• Set BACKFILL_MAX_PENDING_MESSAGES lower (e.g., 100k) for small instances

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Cloud instances

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Getting help

• Start minimal and monitor metrics
• Join Discord or Slack for sizing advice
• Consider our managed offering for automatic scaling