Slide 1
Slide 1 text
No content
Slide 2
Slide 2 text
Beyond
Development
Slide 3
Slide 3 text
Brian Kuo
LINE TRAVEL / Backend Engineer
LINE TECH FRESH
NTU IM / NTU CSIE
Slide 4
Slide 4 text
01
02
03
04
What Observability is and Why it is important
Applying Observability to find error and improve
Tech Stacks & Concepts I think you should need
From 20 to 2 Seconds
How I Prepare for LINE Interview
An Organization Culture and work style I appreciate
How is it like to be a LINER
Intro to Observability
CONTENT
Slide 5
Slide 5 text
Intro to
Observability
What it is and Why it is Important?
Slide 6
Slide 6 text
Observability
Proactive Issue Detection
Root Cause Analysis
Performance Optimization
Observability, What’s & Why’s
Slide 7
Slide 7 text
Metrics
Logging Traces
Three Pillars of Observability
Slide 8
Slide 8 text
Logging
• Immutable / Timestamped
record of discrete events
• Structured (JSON) format
• Record necessary info for each
request
Recording the system's state when
each individual event occurs.
Logging
Slide 9
Slide 9 text
No content
Slide 10
Slide 10 text
Logging
• Contains of:
• ID: metric name + label
• Sample: value + timestamp
• Constant overhead (only value is updated)
• Easy to configure alerting rules
Quantitative insights into system
performance and resource utilization.
Metrics
Slide 11
Slide 11 text
No content
Slide 12
Slide 12 text
Logging • End-to-end visibility
• Critical path detection
Detailed analysis of request flow and
dependencies for effective troubleshooting.
Traces
Slide 13
Slide 13 text
No content
Slide 14
Slide 14 text
From 20 to 2
Seconds
How we apply observability to find
error and improve the performance
Slide 15
Slide 15 text
About the Hotel Query Feature
Hotel query result cannot be returned
and displayed within 30 seconds
Problem Statement:
Slide 16
Slide 16 text
01 Alerting (Metrics)
02 Searching Error Info (Logging)
Hotel query from ElasticSearch experienced
an abnormally long execution
Being alerted that we have encountered
extremely slow execution time for hotel query
Finding Error with Observability
Slide 17
Slide 17 text
03 Source of Error
The findIndex method takes too long for matching
key and id. The time complexity is O(mn)
Finding Error with Observability
A Simple Example
Slide 18
Slide 18 text
Improving the Time Complexity from O(mn) to O(m+n)
Boosting Efficiency with Map
AS IS TO BE
n
m
Slide 19
Slide 19 text
How I Prepare for
LINE Interview
Tech Stacks & Concepts I think you
should need
Slide 20
Slide 20 text
Tech Stacks
You Might Need
Slide 21
Slide 21 text
Referring to
Others’ Experiences
Trust me, It is very Important!
Slide 22
Slide 22 text
Also, Belief
Matters…
I’m really Superstitious…
Slide 23
Slide 23 text
How is it like
to be a LINER
An Organization Culture and work
style I appreciate
Slide 24
Slide 24 text
No Stupid
Questions
Embracing
Changes
Everyone
Matters
Organization Culture of LINE
Slide 25
Slide 25 text
No Stupid
Questions
Embracing
Changes
Everyone
Matters
LIFE at LINE
Slide 26
Slide 26 text
Sharing From Last Year’s
APCS Camp Visit
Slide 27
Slide 27 text
Feel free to contact me!
2100
特點項⽬⽂字
特點項⽬
Any Questions?
1234
特點項⽬⽂字
特點項⽬
999
特點項⽬⽂字
特點項⽬
Facebook Linkedin
Slide 28
Slide 28 text
No content