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How to Analyze Impact of Changes

Understand what's affected when a node changes, fails, or is removed.

Quick Answer​

# What depends on this node? (incoming edges)
grph neighbors graph.gexf target-node --direction in

# What does this node depend on? (outgoing edges)
grph neighbors graph.gexf target-node --direction out

Examples​

Dependency Impact Analysis​

If we upgrade React, what packages are affected?

# Find all packages that depend on React
grph neighbors dependencies.gexf react --direction in

Transitive Impact​

What about packages that depend on packages that depend on React?

# Expand to depth 2
grph neighbors dependencies.gexf react --direction in --depth 2

Service Impact Analysis​

If auth-service goes down, what breaks?

# Find all services that call auth-service
grph neighbors microservices.gexf auth-service --direction in --depth 3

Network Failure Analysis​

If a critical router fails, what's affected?

# Find everything reachable from/through this node
grph neighbors network.gexf critical-router --depth 2

Quantifying Impact​

Count affected nodes:

grph neighbors graph.gexf node --direction in --json | grep '"id"' | wc -l

Identify Critical Nodes​

Nodes with high betweenness are critical - many paths go through them:

grph centrality graph.gexf --type betweenness --top 10

These nodes cause the most disruption if removed.