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Crypto / Web3

Rescued Crypto Exchange During $50M Trading Surge

23 minutes
2 engineers
Cryptocurrency Exchange
KubernetesAWSRedis SentinelPostgreSQLKafka
23 min
Time to Fix
$50M
Orders Recovered
Zero
Data Loss
99.99%
Uptime Since
Emergency Recovery
Metric
Before
After
Matching Engine
Down
Operational 23 min fix
Pending Orders
$50M queued
$0 queued All processed
Redis State
Split-brain
Cluster mode Upgraded
Uptime Since
Outage
99.99% 8 months
Crypto exchange matching engine emergency recovery architectureCrypto exchange matching engine emergency recovery architecture
Crypto Rescue Timeline — Redis Cluster Recovery in 23 Minutes

The Challenge

During a volatile market event, the matching engine crashed with $50M in pending orders. Traders couldn't execute, and regulatory reporting deadlines were at risk.

✗Redis sentinel failover left cluster in split-brain state
✗$50M in pending orders stuck in Kafka queue
✗Order book state inconsistent between replicas
✗Regulatory requirement to process all orders within 1 hour

Our Solution

Diagnosed Redis split-brain, forced failover to healthy primary, rebuilt order book from PostgreSQL WAL + Kafka offset replay, then drained pending orders.

Identified Redis split-brain via sentinel quorum analysis
Force-promoted healthy replica to primary
Rebuilt order book by replaying Kafka offsets from last consistent snapshot
Drained $50M pending orders in priority sequence
Deployed Redis Cluster (replacing Sentinel) to prevent recurrence
Results & Impact

Exchange now handles 100K orders/second. Zero matching engine incidents in 8 months.

Project Timeline

+0 min
Alert — matching engine unresponsive, orders queuing
+3 min
CloudLink SRE on call, diagnosed Redis split-brain
+8 min
Forced Redis failover to healthy replica
+15 min
Order book rebuilt from WAL + Kafka replay
+23 min
All pending orders drained, trading resumed
C

"$50M in orders queued, matching engine down. CloudLink had us trading in 23 minutes."

CTO
Cryptocurrency Exchange

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