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Continuous Integration
on Steroids
Akbashev Alexander
Highload++ | November 07, 2016
Continuous Integration на стероидах / Александр Акбашев (HERE)
Agenda
01. CI in HERE
02. Monitoring
03. Scalability
04. Jenkins
05. Nightmares Plugins
06. Morale
07. Q&A
01
Continuous Integration in
HERE
Every change goes through validation pipeline
Gerrit
Gerrit
Plugin
Pre-submit
Trigger
Pre-submit
Trigger
Build
Build
Build
Build
Build
Tests
Tests
Tests
Tests
Tests
Tests
Tests
Tests
Tests
Tests
Tests
Tests
Tests
Feedback goes from tests back to Gerrit
Gerrit
Gerrit
Plugin
Pre-submit
Trigger
Pre-submit
Trigger
Build
Build
Build
Build
Build
Tests
Tests
Tests
Tests
Tests
Tests
Tests
Tests
Tests
Tests
Tests
Tests
Tests
Feedback comes from every pipeline
Gerrit
Gerrit
Plugin
Pre-submit
Trigger
Pre-submit
Trigger
Build
Build
Build
Build
Build
Tests
Tests
Tests
Tests
Tests
Tests
Tests
Tests
Tests
Tests
Tests
Tests
Tests
Numbers
100k+ builds per day ~1.5k concurrent builds 1.3-2.5k executors
• Each “build” is
execution of one build/
test job
• Total number correlates
with number of commits
• Number of builds is not
so important as number
of commits
• Big throughput is
extremely important
• Morning commit
• Before lunch
• “Last attempt for today”
• Raised on-demand
• Health checks
• Jenkins strategy is not
optimized for cloud
02
Monitoring
Collects information about every build in system
Groovy
Event
Listener
Plugin
Jenkins
build
Fluentd InfluxDB Grafana
Collects information about every build in system
Groovy
Event
Listener
Plugin
Jenkins
build Fluentd InfluxDB Grafana
JVM stats are the best “canary”
Groovy
Event
Listener
Plugin
Jenkins
build
Fluentd InfluxDB Grafana
Jenkins
JVM
Continuous Integration на стероидах / Александр Акбашев (HERE)
03
Scalability
What do we want to achieve?
What do we want to achieve?
Keep feedback time (< 20 min.)
What do we want to achieve?
Keep feedback time (< 20 min.)
Test as much as possible
What do we want to achieve?
Keep feedback time (< 20 min.)
Test as much as possible
… with debug symbols
What do we want to achieve?
Keep feedback time (< 20 min.)
Test as much as possible
… with debug symbols
… and code coverage information
What do we want to achieve?
Keep feedback time (< 20 min.)
Test as much as possible
… with debug symbols
… and code coverage information
and on physical devices
How to scale
Increase number of executors
Minimize job execution time
Smart testing
How to increase number of executors?
EC2 Plugin
TestDroid
How to minimize job execution time
How to minimize job execution time
Split tests by type
How to minimize job execution time
Split tests by type
Parallel execution
How to minimize job execution time
Split tests by type
Parallel execution
Node as cache storage
How to minimize job execution time
Split tests by type
Parallel execution
Node as cache storage
Shared compiler cache
How to minimize job execution time
Split tests by type
Parallel execution
Node as cache storage
Shared compiler cache
Profiling!
04
Jenkins
Is Jenkins so slow or we are doing something wrong?
Is Jenkins so slow or we are doing something wrong?
Jenkins is ok.
Is Jenkins so slow or we are doing something wrong?
Jenkins is ok.
But…
Surprise #1
Rotation costs a lot
Surprise #2
It works much better with nginx
less jenkins.access.log | tail -n1000 | grep urt="-" | wc -l
407
Surprise #3
Some buttons are very dangerous
Surprise #3
Some buttons are very dangerous
Slave
Slave
One fundamental issue
Master
Slave
Slave
Slave
Slave
Slave
Slave
Users
What can you find in heap dump of OOM-Killed Jenkins?
What can you find in heap dump of OOM-Killed Jenkins?
Console logs
Console logs
Should be less than X MB
Verbose output goes to file
“>” and “tee” are amazing!
What can you find in heap dump of OOM-Killed Jenkins?
Console logs
What can you find in heap dump of OOM-Killed Jenkins?
Console logs
Build history
Build history
2000 entities or 3 days
Efficient rotator
What can you find in heap dump of OOM-Killed Jenkins?
Console logs
Build history
What can you find in heap dump of OOM-Killed Jenkins?
Console logs
Build history
Build artifacts
Build artifacts
Push to S3 directly from slaves
Don’t store anything on master
05
Nightmares Jenkins Plugins
Limit of number of builds
20K
Groovy Event Listener Plugin
all events
synchronized
groovy compilation
fixed since 1.010 (Mar 10, 2016)
Limit of number of builds
40K
Warnings Plugin
Just another parser of console log
parseConsole is “deprecated”
parseFile is allowed
0 warnings are very appreciated :)
Limit of number of builds
60K
Timestamper Plugin
Tail needs not only “tail”
fixed since 1.8.5 (Aug 31, 2016)
Limit of number of builds
60K
EC2 Plugin
Full list of all images in AWS
fixed since 1.35 (Jun 30, 2016)
Limit of number of builds
90K
Robot Framework Plugin
Green chart costs 100 times more
Replaced by xUnit Plugin
Limit of number of builds
120K
Build Failure Analyzer Plugin
One regexp
One stream
One thread
PR-57 is not accepted yet
Limit of number of builds
140K
Cleanup Workspace Plugin
`ü` breaks everything
PR-29 is not accepted yet
06
Morale
Final recommendations
Final recommendations
Think about scalability at first place
Final recommendations
Think about scalability at first place
Flakiness could be a huge problem
Final recommendations
Think about scalability at first place
Flakiness could be a huge problem
Reduce memory allocations
Final recommendations
Think about scalability at first place
Flakiness could be a huge problem
Reduce memory allocations
Cache as much as possible
Final recommendations
Think about scalability at first place
Flakiness could be a huge problem
Reduce memory allocations
Cache as much as possible
Failing builds can be expensive
Workflow
Slowness? Profile! Fix! Contribute!
Open source collaboration
Let’s make our life better ;)
Full list of our contributions related to this talk
• Jenkins
• ccache
• clcache
• EC2 Plugin
• S3 Plugin
• FluentD Plugin
• BuildRotator Plugin
• Groovy Event Listener Plugin
• Timestamper Plugin
• Robot Framework Plugin
• Build Failure Analyzer Plugin
• JVM GC Log Plugin for
FluentD
Thank you
Contact
Akbashev Alexander
GitHub: Jimilian
E-mail: alexander.akbashev@here.com

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