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Infrastructure at Scale: Apache Kafka, Twitter Storm & Elastic Search (ARC303) | AWS re:Invent 2013

"This is a technical architect's case study of how Loggly has employed the latest social-media-scale technologies as the backbone ingestion processing for our multi-tenant, geo-distributed, and real-time log management system. This presentation describes design details of how we built a second-generation system fully leveraging AWS services including Amazon Route 53 DNS with heartbeat and latency-based routing, multi-region VPCs, Elastic Load Balancing, Amazon Relational Database Service, and a number of pro-active and re-active approaches to scaling computational and indexing capacity. The talk includes lessons learned in our first generation release, validated by thousands of customers; speed bumps and the mistakes we made along the way; various data models and architectures previously considered; and success at scale: speeds, feeds, and an unmeltable log processing engine."

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Unmeltable Infrastructure at Scale:
Using Apache Kafka, Twitter Storm, and
ElasticSearch on AWS
Jim Nisbet

Philip O’Toole

CTO and VP of Engineering, Loggly

Lead Developer, Infrastructure, Loggly

November 2013

© 2013 Amazon.com, Inc. and its affiliates. All rights reserved. May not be copied, modified, or distributed in whole or in part without the express consent of Amazon.com, Inc.
What Loggly Does
• Log Management as a service
– Near real-time indexing of events

• Distributed architecture, built on AWS
• Initial production services in 2010
– Loggly Generation 2 released in Sept 2013

• Thousands of customers
Agenda for this Presentation
•
•
•
•
•

A bit about logging
Lessons learned from our first generation
How we leverage AWS services
Our use of Kafka, Storm, ElasticSearch
What worked well for us and what did not
Log Management
• Everyone starts with …
– A bunch of log files (syslog, application specific)
– On a bunch of machines

• Management consists of doing the simple stuff
– Rotate files, compress and delete
– Information is there but awkward to find specific events
– Weird log retention policies evolve over time
“…how can I make this someone else’s problem!”

“…hmmm, our logs are getting a bit bloated”

Log Volume

Self-Inflicted Pain

“…let’s spend time managing our log capacity”
Best Practices in Log Management
• Use existing logging infrastructure
– Real time syslog forwarding is built in
– Application log file watching

• Store logs externally
– Accessible when there is a system failure

• Log messages in machine parsable format
– JSON encoding when logging structured information
– Key-value pairs
Ad

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Infrastructure at Scale: Apache Kafka, Twitter Storm & Elastic Search (ARC303) | AWS re:Invent 2013

  • 1. Unmeltable Infrastructure at Scale: Using Apache Kafka, Twitter Storm, and ElasticSearch on AWS Jim Nisbet Philip O’Toole CTO and VP of Engineering, Loggly Lead Developer, Infrastructure, Loggly November 2013 © 2013 Amazon.com, Inc. and its affiliates. All rights reserved. May not be copied, modified, or distributed in whole or in part without the express consent of Amazon.com, Inc.
  • 2. What Loggly Does • Log Management as a service – Near real-time indexing of events • Distributed architecture, built on AWS • Initial production services in 2010 – Loggly Generation 2 released in Sept 2013 • Thousands of customers
  • 3. Agenda for this Presentation • • • • • A bit about logging Lessons learned from our first generation How we leverage AWS services Our use of Kafka, Storm, ElasticSearch What worked well for us and what did not
  • 4. Log Management • Everyone starts with … – A bunch of log files (syslog, application specific) – On a bunch of machines • Management consists of doing the simple stuff – Rotate files, compress and delete – Information is there but awkward to find specific events – Weird log retention policies evolve over time
  • 5. “…how can I make this someone else’s problem!” “…hmmm, our logs are getting a bit bloated” Log Volume Self-Inflicted Pain “…let’s spend time managing our log capacity”
  • 6. Best Practices in Log Management • Use existing logging infrastructure – Real time syslog forwarding is built in – Application log file watching • Store logs externally – Accessible when there is a system failure • Log messages in machine parsable format – JSON encoding when logging structured information – Key-value pairs
  • 7. From the Trenches… • Managing Applications vs. Managing Logs – Do not make this is an either/or proposition! If you get a disk space alert, first login… % sudo rm –rf /var/log/apache2/* Admit it, we’ve all seen this kind of thing!
  • 8. You Have Logs... 2013-10-25T18:35:43.387+0000: 441.482: [GC [PSYoungGen: 2430541K->268617K(2484544K)] 7687523K->5660738K(8076992K), 0.3266870 secs] [Times: user=1.05 sys=0.17, real=0.33 secs] 2013-10-25T18:35:43.714+0000: 441.809: [Full GC [PSYoungGen: 268617K->0K(2484544K)] [ParOldGen: 5392121K->354965K(5592448K)] 5660738K->354965K(8076992K) [PSPermGen: 44444K->44395K(83968K)], 0.9225290 secs] [Times: user=2.22 sys=0.26, real=0.92 secs] • In this case, JVM garbage collection logs enabled with… -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintGCTimeStamps
  • 9. Yes, you need to search these logs
  • 10. But you also need to to spot trends
  • 11. Loggly Offers Logging as a Service
  • 12. Loggly First Generation • Logging as a service – Near real-time searchable logs • Thousands of customers – Transmission rates from 10 events/sec to 100k events/sec – When customers systems are busy they send more logs – Log traffic has distinct bursts; bursts can last for several hours • Amazon EC2 deployment – We used EC2 Instance storage • SOLR Cloud – Full power of Lucene search – Tens of thousands of shards (with special ‘sleep shard’ logic) • ZeroMQ for message queue
  • 13. First Generation Lessons Learned • Event ingestion too tightly coupled to indexing – Manual re-indexing for temporary SOLR issues • Multiple Indexing strategies needed – 4 orders of magnitude difference between our high volume users and our low volume users (10 eps vs. 100,000+ eps) – Too much system overhead for low volume users – Difficult to support changing indexing strategies for a customer
  • 14. Big Data Infrastructure Solutions We are not alone… • Our challenges – – – – – Massive incoming event stream Fundamentally multi-tenant Scalable framework for analysis Near real-time indexing Time series index management Scalability Real Time Analytics Multi tenant SaaS
  • 15. Apache Kafka • Overview – – – – An Apache project initially developed at LinkedIn Distributed publish-subscribe messaging system Specifically designed for real time activity streams Does not follow JMS Standards nor uses JMS APIs • Key Features – – – – Persistent messaging High throughput, low overhead Uses ZooKeeper for forming a cluster of nodes Supports both queue and topic semantics
  • 17. Storm Framework • Storm (open sourced by Twitter) – Open sourced September 2011 – Now an Apache Software Foundation project • Currently Incubator Status • Framework is for stream processing – – – – Distributed Fault tolerant Computation Fail-fast components
  • 18. Storm Logical View Example Topology Bolt Spout Bolt Bolt Bolt Spouts emit source stream Bolts perform stream processing Storm terminology • Streams, Spouts, Bolts, Tasks, Workers, Stream Groups and Topologies
  • 20. ElasticSearch • Open source – Commercial support available from ElasticSearch.com – Growing open-source community • • • • • Distributed search engine Fully exposes Lucene search functionality Built for clustering from the ground-up High availability Multi-tenancy
  • 21. ElasticSearch In Action • Add/delete nodes dynamically • Add indices with REST API • Indices and Nodes have attributes – Indices automatically moved to best Nodes • Indices can be sharded • Supports bulk insertion of events • Plugins for monitoring cluster
  • 23. Generation 2 – The Challenge • Always accept log data – Never make a customer’s incident worse • Never drop log data – A single log message could be critical • True Elasticity
  • 24. Perfect Match For Real Time Log Events • Apache Kafka – Extremely high-performance pub-sub persistent queue • Consumer tracks their location in queue – A good fit for our use cases • Multiple Kafka brokers – Good match for AWS • Multiple brokers per region • Availability Zone separation
  • 25. Real Time Event Processing • Twitter Storm – Scalable real-time computation system • Storm used as a “pull” system – Provisioned for average load, not peak load – Input from Kafka queue • Worker nodes can be scaled dynamically • Elasticity is key – Another good match for AWS • Able to scale workers up and down dynamically
  • 28. Loggly Collector Performance • C++ multi-threaded • Boost ASIO framework • Each Collector can handle 250k+ events per second – Per m2.2xlarge instance 1 x EC2 m2.2xlarge Collector instance (300 byte average event size).
  • 31. Event Pipeline in Summary • Storm provides Complex Event Processing – Where we run much of our secret-sauce • Kafka contains both raw and processed Events • Snapshot the last day of Kafka events to S3
  • 32. Elastic Search Clusters From Kafka Multi-Tiered Elastic Cluster
  • 33. Loggly and Index Management • Indices are time-series data – Separated by customer – Represent slices of time • Higher volume index will have shorter time slice • Multi-tier architecture for efficient indexing – Multiple indexing tiers mapped to different AWS instance types • Efficient use of AWS resources
  • 36. Kafka enables Staging Architecture • Kafka Broker doesn’t care if there are multiple consumers • Staging system runs pre-production code • Pub-sub allows us to randomly index a fraction of our production load • A highly-effective pre-production system
  • 38. AWS Deployment Instances – Collection c1.xlarge m2.2xlarge • • • • • Compute-optimized High-traffic ingestion points Disk not important Memory-optimized Disk buffer caching 4K Provisioned IOPs EBS • • • Ensures consistent IO No noisy-neighbors Persistent storage
  • 39. AWS Deployment Instances – Processing ZooKeeper c1.xlarge • • • Compute-optimized CPU-intensive processing Network IO m1.xlarge • • • General-purpose Configuration Management
  • 40. AWS Deployment Instances – Indexing cc2.8xlarge • 4K Provisioned IOPs EBS m2.4xlarge • 4K Provisioned IOPs EBS
  • 41. A Few False Starts
  • 42. Elastic Load Balancing in front of Collector Had Limitations • Initial testing used Elastic Load Balancing for incoming events: • Elastic Load Balancing doesn’t allow forwarding port 514 (syslog) • Elastic Load Balancing doesn’t support forwarding UDP • Event traffic can burst and hit Elastic Load Balancing performance limits
  • 43. Amazon Route 53 DNS Round Robin a Win • DNS Round Robin is pretty basic load balancing – Not a bump in the wire • Take advantage of AWS failover health checks – When a collector goes out of service, it will be out of the DNS rotation • Round Robin across multiple regions, AZs – Latency based resolution optimizes inbound traffic
  • 44. Our First Plan for Log Events • Cassandra – Highly scalable key-value store – Impressive write performance a good match for us – Apache project plus commercial support with DataStax • Use Cassandra for both our Event Queue and Persistent Store – Our strategy was to get the raw event in to Cassandra – …then perform workflow processing on events
  • 45. Design meets Reality • Cassandra not designed to be a message queue • Hard to track Events received out-of-order • Multi-tenancy requires handling data bursts – Collectors still needed to be able to buffer to disk – Added complexity and became a point of failure
  • 46. Big Wins • Leveraging AWS services – – – – Multi-region, multi-AZ Provisioned IOPS for availability and scale Amazon Route 53 DNS support with latency resolution Easy to increase and decrease Storm resources • Leveraging Open Source infrastructure – Apache Kafka – Twitter Storm – ElasticSearch • Pre-production “Staging” system
  • 47. The Means to an End
  • 48. Feedback • Questions? Jim Nisbet (niz@loggly.com) CTO and VP of Engineering, Loggly Philip O’Toole (philip@loggly.com) Lead Developer, Infrastructure, Loggly Follow us @loggly!
  • 49. Please give us your feedback on this presentation ARC303 As a thank you, we will select prize winners daily for completed surveys!