Built for monitoring distributed systems

Event Stream Processing (like ESPER/Drools Fusion) Shared-State (index)

Open Source (written by aphyr (Kyle Kingsbury))

riemann.io

Concepts

host ‘A’

service ‘req_latency’

state ‘ok’

metric 1

ttl 60

tags ‘important’

event

Concepts

(host, service) last event

(‘A’, ‘req_latency’)

(‘B’, ‘req_latency’)

(‘C’, ‘req_latency’)

(‘D’, ‘req_latency’)

index

Heartbeat Trigger

(expired (tagged “keep_alive” (email "alert@devops.tlv")))

Heartbeat Trigger

Threshold Trigger

Threshold Trigger

(where (and (service "req_latency") (> metric 10)) (email "alert@devops.tlv"))

Change State(host, service) metric state

('A', 'req_latency') 20 error

('B', 'req_latency') 1 ok

('C', 'req_latency') 5 error

('D', 'req_latency') 5 ok

Change State

(where (service “req_latency”) (split (< metric 2) (with :state "ok" index) (> metric 10) (with :state "error" index)))

(changed-state {:init “ok”} (email alert@devops.tlv))

Time Window Statistics

ClusterStatistics

Cluster Statistics

(by [:host] (where (service "req_latency") (percentiles 60 [0.5] index-max-of-median)))

(def index-max-of-median (smap folds/maximum index))

Event Storm Filtering

Event Storm Filtering

(def alert-devops (throttle 100 3600

(rollup 3 3600 (email "alert@devops.tlv"))))

(where (tagged "db-connection-exception") alert-devops)

Event Enrichment host ‘A’

service ‘req_latency’

state ‘ok’

metric 1

ttl 60

tags ‘important’

tenant 1

Event Enrichment

(defn change-event [my-key my-value & children](fn [event] (let [my-event (assoc event :my-key :my-value)] (call-rescue my-event children))))

(change-event 'tenant' '1' index)

Tenant 1 Tenant 2 Tenant 3

Multi-Tenancy

(def riemann-agg (tcp-client :host "agg-hostname"))

(changed-state (change-event 'tenant' '1') (forward riemann-agg))

http://riemann.io