Clojure News Feed Performance Testing

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Information about Clojure News Feed Performance Testing

Published on February 14, 2014

Author: gengstrand



Do web services written in Clojure perform as well as those written in Java? We put this modest 5 node cluster to the load test on EC2 just to see what it could take.

Clojure Performance Measuring throughput and latency Of a news feed Web service Written in Clojure

Features ● Participant Profiles ● Social Graph ● Social Broadcast ● Inbound Activity ● Outbound Activity ● Keyword Search

Components ● Postgresql ● Cassandra ● Solr ● Kafka ● Redis ● Jetty

Source Code ●

AWS Deployment ● Ubuntu Server 12.04.3 LTS 64 bit ● Servers (no provisioned IOPs) – ● Database (RDS) – ● m1.medium (2 ECUs, 1 vCPUs, 3.7 GiB memory, 1 x 410 GiB Storage Capacity) db.m1.medium Client Load Machine – m1.large (4 ECUs, 2 vCPUs, 7.5 GiB memory, 2 x 420 GiB Storage Capacity)


Throughput ● 100 threads ● Connection pool max size: 50 ● 5 < Social Broadcast < 50 ● 10 posts per user ● 10% searches ● 55 posts per second

Latency Overall ● Poor at the beginning – cold cache ● Really good 15 minutes in ● Bad spike near the end of the first hour ● Steady performance in the second hour

Postgresql Latency

Cassandra Latency

Solr Latency

Web Service Latency

Summary ● Cloud Spike ● Postgresql latency similar to Cassandra ● Solr indexing twice as slow ● Between 50 and 70 requests per second ● Clojure just as fast as Java ● Jetty performed well

Thanks Glenn Engstrand

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