Les Vendredis noirs : même pas peur ! - Breizhcamp

Surveiller une application complexe n'est pas une tâche aisée, mais avec les bons outils, ce n'est pas si sorcier. Néanmoins, des périodes fortes telles que les opérations de type "Black Friday" (Vendredi noir) ou période de Noël peuvent pousser votre application aux limites de ce qu'elle peut supporter, ou pire, la faire crasher. Parce que le système est fortement sollicité, il génère encore davantage de logs qui peuvent également mettre à mal votre système de supervision.

Dans cette session, j'aborderai les bonnes pratiques d'utilisation de la suite Elastic pour centraliser et monitorer vos logs. Je partagerai également avec vous quelques trucs et astuces pour vous aider à passer sans souci vos Vendredis noirs !

Nous verrons :

Les architectures de monitoring
Trouver la taille optimale pour l'API _bulk
Distribuer la charge
Taille des index et des shards
Optimiser les E/S disque

Vous ressortirez de la session avec : des bonnes pratiques pour bâtir son système de monitoring avec la suite Elastic, le tuning avancé pour optimiser les performances d'ingestion et de recherche.

Transcript

1. David Pilato Developer | Evangelist, @dadoonet Les Vendredis noirs : même pas peur !
4. Data Platform Architectures
5. life:universe user:soulmate _Search? outside the box city:restaurant car:model fridge:leftovers work:dreamjob
7. Logging
8. Metrics
9. Security Analytics
10. Security Analytics
11. APM
12. @dadoonet sli.do/elastic 19 The Elastic Journey of Data Beats Log Files Metrics Wire Data your{beat} Data Store Web APIs Social Sensors Elasticsearch Master Nodes (3) Ingest Nodes (X) Data Nodes Hot (X) Data Notes Warm (X) Logstash Nodes (X) Kafka Redis Messaging Queue Kibana Instances (X) Notification Queues Storage Metrics X-Pack X-Pack X-Pack
13. @dadoonet sli.do/elastic 20 Provision and manage multiple Elastic Stack environments and provide search-aaS, logging-aaS, BI-aaS, data-aaS to your entire organization
14. @dadoonet sli.do/elastic 21 Hosted Elasticsearch & Kibana Includes X-Pack features Starts at $45/mo Available in Amazon Web Service Google Cloud Platform
15. Elasticsearch
 Cluster Sizing
16. @dadoonet sli.do/elastic 23 Terminology Cluster my_cluster Server 1 Node A d1 d2 d3 d4 d5 d6 d7 d8 d9 d10 d11 d12 Index twitter d6 d3 d2 d5 d1 d4 Index logs
17. @dadoonet sli.do/elastic 24 Partition Cluster my_cluster Server 1 Node A d1 d2 d3 d4 d5 d6 d7 d8 d9 d10 d11 d12 Index twitter d6 d3 d2 d5 d1 d4 Index logs Shards 0 1 4 2 3 0 1
18. @dadoonet sli.do/elastic 25 Distribution Cluster my_cluster Server 1 Node A Server 2 Node B twitter shard P4 d1 d2 d6 d5 d10 d12 twitter shard P2 twitter shard P1 logs shard P0 d2 d5 d4 logs shard P1 d3 d4 d9 d7 d8 d11 twitter shard P3 twitter shard P0 d6 d3 d1
19. @dadoonet sli.do/elastic 26 Replication Cluster my_cluster Server 1 Node A Server 2 Node B twitter shard P4 d1 d2 d6 d5 d10 d12 twitter shard P2 twitter shard P1 logs shard P0 d2 d5 d4 logs shard P1 d3 d4 d9 d7 d8 d11 twitter shard P3 twitter shard P0 twitter shard R4 d1 d2 d6 d12 twitter shard R2 d5 d10 twitter shard R1 d6 d3 d1 d6 d3 d1 logs shard R0 d2 d5 d4 logs shard R1 d3 d4 d9 d7 d8 d11 twitter shard R3 twitter shard R0 • Primaries • Replicas
20. @dadoonet sli.do/elastic 27 Scaling Data
21. @dadoonet sli.do/elastic 28 Scaling Data
22. @dadoonet sli.do/elastic 29 Scaling Data
23. @dadoonet sli.do/elastic 30 Scaling Big Data ... ...
24. @dadoonet sli.do/elastic 31 Scaling • In Elasticsearch, shards are the working unit • More data -> More shards Big Data ... ...
25. @dadoonet sli.do/elastic 31 Scaling • In Elasticsearch, shards are the working unit • More data -> More shards Big Data ... ... But how many shards?
26. @dadoonet sli.do/elastic 32 How much data? • ~1000 events per second • 60s * 60m * 24h * 1000 events => ~87M events per day • 1kb per event => ~82GB per day • 3 months => ~7TB
27. @dadoonet sli.do/elastic 33 Shard Size • It depends on many different factors ‒ document size, mapping, use case, kinds of queries being executed, desired response time, peak indexing rate, budget, ... • After the shard sizing*, each shard should handle 45GB • Up to 10 shards per machine * https://www.elastic.co/elasticon/conf/2016/sf/quantitative-cluster-sizing
28. @dadoonet sli.do/elastic 34 How many shards? • Data size: ~7TB • Shard Size: ~45GB* • Total Shards: ~160 • Shards per machine: 10* • Total Servers: 16 * https://www.elastic.co/elasticon/conf/2016/sf/quantitative-cluster-sizing Cluster my_cluster 3 months of logs ...
29. @dadoonet sli.do/elastic 35 But... • How many indices? • What do you do if the daily data grows? • What do you do if you want to delete old data?
30. @dadoonet sli.do/elastic 36 Time-Based Data • Logs, social media streams, time-based events • Timestamp + Data • Do not change • Typically search for recent events • Older documents become less important • Hard to predict the data size
31. @dadoonet sli.do/elastic 37 Time-Based Data • Time-based Indices is the best option ‒ create a new index each day, week, month, year, ... ‒ search the indices you need in the same request
32. @dadoonet sli.do/elastic 38 Daily Indices Cluster my_cluster d6 d3 d2 d5 d1 d4 logs-2017-10-06
33. @dadoonet sli.do/elastic 39 Daily Indices Cluster my_cluster d6 d3 d2 d5 d1 d4 logs-2017-10-07 d6 d3 d2 d5 d1 d4 logs-2017-10-06
34. @dadoonet sli.do/elastic 40 Daily Indices Cluster my_cluster d6 d3 d2 d5 d1 d4 logs-2017-10-06 d6 d3 d2 d5 d1 d4 logs-2017-10-08 d6 d3 d2 d5 d1 d4 logs-2017-10-07
35. @dadoonet sli.do/elastic 41 Templates • Every new created index starting with 'logs-' will have ‒ 2 shards ‒ 1 replica (for each primary shard) ‒ 60 seconds refresh interval PUT _template/logs { "template": "logs-*", "settings": { "number_of_shards": 2, "number_of_replicas": 1, "refresh_interval": "60s" } } More on that later
36. @dadoonet sli.do/elastic 42 Alias Cluster my_cluster d6 d3 d2 d5 d1 d4 logs-2017-10-06 users Application logs-write logs-read
37. @dadoonet sli.do/elastic 43 Alias Cluster my_cluster d6 d3 d2 d5 d1 d4 logs-2017-10-06 users Application logs-write logs-read d6 d3 d2 d5 d1 d4 logs-2017-10-07
38. @dadoonet sli.do/elastic 44 Alias Cluster my_cluster d6 d3 d2 d5 d1 d4 logs-2017-10-06 users Application logs-write logs-read d6 d3 d2 d5 d1 d4 logs-2017-10-07 d6 d3 d2 d5 d1 d4 logs-2017-10-08
39. Detour: Rollover API https://www.elastic.co/guide/en/elasticsearch/reference/5.6/indices-rollover-index.html
40. @dadoonet sli.do/elastic 46 Do not Overshard • 3 different logs • 1 index per day each • 1GB each • 5 shards (default): so 200mb / shard vs 45gb • 6 months retention • ~900 shards for ~180GB • we needed ~4 shards! don't keep default values! Cluster my_cluster access-... d6 d3 d2 d5 d1 d4 application-... d6 d5 d9 d5 d1 d7 mysql-... d10 d59 d3 d5 d0 d4
41. @dadoonet sli.do/elastic 47
42. @dadoonet sli.do/elastic 47
43. Detour: Shrink API https://www.elastic.co/guide/en/elasticsearch/reference/5.6/indices-shrink-index.html
44. @dadoonet sli.do/elastic 49 Scaling the search Big Data ... ... 1M users But what happens if we have 2M users?
45. @dadoonet sli.do/elastic 50 Scaling the search Big Data ... ... 1M users ... ... 1M users
46. @dadoonet sli.do/elastic 51 Scaling the search Big Data ... ... 1M users ... ... 1M users ... ... 1M users
47. @dadoonet sli.do/elastic 52 Scaling the search Big Data ... ... ... ... ... ... U s e r s
48. @dadoonet sli.do/elastic 53 Shards are the working unit • Primaries ‒ More data -> More shards ‒ write throughput (More writes -> More primary shards) • Replicas ‒ high availability (1 replica is the default) ‒ read throughput (More reads -> More replicas)
49. Optimal Bulk Size
50. @dadoonet sli.do/elastic 55 What is Bulk? Elasticsearch Master Nodes (3) Ingest Nodes (X) Data Nodes Hot (X) Data Notes Warm (X) X-Pack __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ _____ 1000
 log events Beats Logstash Application 1000 index requests with 1 document 1 bulk request with 1000 documents
51. @dadoonet sli.do/elastic 56 What is the optimal bulk size? Elasticsearch Master Nodes (3) Ingest Nodes (X) Data Nodes Hot (X) Data Notes Warm (X) X-Pack __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ _____ 1000
 log events Beats Logstash Application 4 * 250? 1 * 1000? 2 * 500?
52. @dadoonet sli.do/elastic 57 It depends... • on your application (language, libraries, ...) • document size (100b, 1kb, 100kb, 1mb, ...) • number of nodes • node size • number of shards • shards distribution
53. @dadoonet sli.do/elastic 58 Test it ;) Elasticsearch Master Nodes (3) Ingest Nodes (X) Data Nodes Hot (X) Data Notes Warm (X) X-Pack __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ _____ 1000000
 log events Beats Logstash Application 4000 * 250-> 160s 1000 * 1000-> 155s 2000 * 500-> 164s
54. @dadoonet sli.do/elastic 59 Test it ;) DATE=`date +%Y.%m.%d` LOG=logs/logs.txt exec_test () { curl -s -XDELETE "http://USER:PASS@HOST:9200/logstash-$DATE" sleep 10 export SIZE=$1 time cat $LOG | ./bin/logstash -f logstash.conf } for SIZE in 100 500 1000 3000 5000 10000; do for i in {1..20}; do exec_test $SIZE done; done; input { stdin{} } filter {} output { elasticsearch { hosts => ["10.12.145.189"] flush_size => "${SIZE}" } } In Beats set "bulk_max_size" in the output.elasticsearch
55. @dadoonet sli.do/elastic 60 Test it ;) • 2 node cluster (m3.large) ‒ 2 vCPU, 7.5GB Memory, 1x32GB SSD • 1 index server (m3.large) ‒ logstash ‒ kibana # docs 100 500 1000 3000 5000 10000 time(s) 191.7 161.9 163.5 160.7 160.7 161.5
56. Distribute the Load
57. @dadoonet sli.do/elastic 62 Avoid Bottlenecks Elasticsearch X-Pack _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ 1000000
 log events Beats Logstash Application single node Node 1 Node 2
58. @dadoonet sli.do/elastic 62 Avoid Bottlenecks Elasticsearch X-Pack _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ 1000000
 log events Beats Logstash Application Node 1 Node 2 round robin
59. @dadoonet sli.do/elastic 63 Clients • Most clients implement round robin ‒ you specify a seed list ‒ the client sniffs the cluster ‒ the client implement different selectors • Logstash allows an array (no sniffing) • Beats allows an array (no sniffing) • Kibana only connects to one single node output { elasticsearch { hosts => ["node1","node2","node3"] } }
60. @dadoonet sli.do/elastic 64 Load Balancer Elasticsearch X-Pack _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ 1000000
 log events Beats Logstash Application LB Node 2 Node 1
61. @dadoonet sli.do/elastic 65 Coordinating-only Node Elasticsearch X-Pack _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ 1000000
 log events Beats Logstash Application Node 3
 co-node Node 2 Node 1
62. @dadoonet sli.do/elastic 66 Test it ;) #docs time(s) 100 500 1000 NO Round Robin 191.7 161.9 163.5 Round Robin 189.7 159.7 159.0 • 2 node cluster (m3.large) ‒ 2 vCPU, 7.5GB Memory, 1x32GB SSD • 1 index server (m3.large) ‒ logstash (round robin configured) ‒ hosts => ["10.12.145.189", "10.121.140.167"] ‒ kibana
63. Optimizing Disk IO
64. @dadoonet sli.do/elastic 68 Durability index a doc time lucene flush buffer index a doc buffer index a doc buffer buffer segment
65. @dadoonet sli.do/elastic 69 refresh_interval • Dynamic per-index setting • Increase to get better write throughput to an index • New documents will take more time to be available for Search. PUT logstash-2017.05.16/_settings { "refresh_interval": "60s" } #docs time(s) 100 500 1000 1s refresh 189.7 159.7 159.0 60s refresh 185.8 152.1 152.6
66. @dadoonet sli.do/elastic 70 Durability index a doc time lucene flush buffer segment trans_log buffer trans_log buffer trans_log elasticsearch flush doc op lucene commit segment segment
67. @dadoonet sli.do/elastic 71 Translog fsync every 5s (1.7) index a doc buffer trans_log doc op index a doc buffer trans_log doc op Primary Replica redundancy doesn’t help if all nodes lose power
68. @dadoonet sli.do/elastic 72 Translog fsync on every request • For low volume indexing, fsync matters less • For high volume indexing, we can amortize the costs and fsync on every bulk • Concurrent requests can share an fsync bulk 1 bulk 2 single fsync
69. @dadoonet sli.do/elastic 73 Async Transaction Log • index.translog.durability ‒ request (default) ‒ async • index.translog.sync_interval (only if async is set) • Dynamic per-index settings • Be careful, you are relaxing the safety guarantees #docs time(s) 100 500 1000 Request fsync 185.8 152.1 152.6 5s sync 154.8 143.2 143.1
70. Final Remarks
71. @dadoonet sli.do/elastic 75 Final Remarks Beats Log Files Metrics Wire Data your{beat} Data Store Web APIs Social Sensors Elasticsearch Master Nodes (3) Ingest Nodes (X) Data Nodes Hot (X) Data Notes Warm (X) Logstash Nodes (X) Kafka Redis Messaging Queue Kibana Instances (X) Notification Queues Storage Metrics X-Pack X-Pack X-Pack
72. @dadoonet sli.do/elastic 76 Final Remarks • Primaries ‒ More data -> More shards ‒ Do not overshard! • Replicas ‒ high availability (1 replica is the default) ‒ read throughput (More reads -> More replicas) Big Data ... ... ... ... ... ... U s e r s
73. @dadoonet sli.do/elastic 77 Final Remarks • Bulk and Test • Distribute the Load • Refresh Interval • Async Trans Log (careful) #docs 100 500 1000 Default 191.7s 161.9s 163.5s RR+60s+Async5s 154.8s 143.2s 143.1s
74. Les Vendredis noirs : même pas peur ! David Pilato Developer | Evangelist, @dadoonet