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์‹ ์ž…์‚ฌ์›์„ ์œ„ํ•œ
์›น์„œ๋น„์Šค ํ™•์žฅ ์ „๋žต
๊ฐ•๋Œ€๋ช… (CHARSYAM@NAVER.COM)
๋ณธ์ธ ์†Œ๊ฐœ
๏ตํ˜„) ์œ ๋ฐ๋ฏธ ๋ฐ์ดํ„ฐ ์—”์ง€๋‹ˆ์–ด
๏ต๊ตฌ) ์นด์นด์˜ค ์Šคํ† ๋ฆฌ ๋ฐฑ์—”๋“œ ์—”์ง€๋‹ˆ์–ด
๏ต๊ตฌ) ๋„ค์ด๋ฒ„ ๋ฉ”์ผ ๋ฐฑ์—”๋“œ ์—”์ง€๋‹ˆ์–ด
๏ต์—ฌ๋Ÿฌ ์˜คํ”ˆ ์†Œ์Šค์— ์ปจํŠธ๋ฆฌ๋ทฐ์…˜ ์ค‘์ž…๋‹ˆ๋‹ค.
์ฃผ์ œ
๏ต์›น์„œ๋น„์Šค๋ฅผ ํ™•์žฅํ•˜๊ธฐ ์œ„ํ•ด์„œ ์•Œ์•„์•ผ ํ•  ๋ฐฉ๋ฒ•๋“ค
์‰ฌ์šด ๋ฐฉ๋ฒ•
๏ต์„œ๋ฒ„๋ฅผ ๋นต๋นตํ•˜๊ฒŒ ๋„ฃ์–ด๋‘ก์‹œ๋‹ค.
๏ต๋‹ค๋งŒ ๋ฒ„๋Š” ๊ฒƒ๋ณด๋‹ค ์“ฐ๋Š” ๊ฒŒ ๋งŽ์œผ๋ฉดโ€ฆ
๋Œ€๊ทœ๋ชจ ์„œ๋น„์Šค ๊ฐœ๋ฐœ
๋…ธํ•˜์šฐ์˜ ํ•„์š”์„ฑ
2011๋…„ bit.ly
ํ•˜๋ฃจ์— 1์–ต 5๋ฐฑ๋งŒ ํด๋ฆญ
(์‹ค์ œ ์‚ฌ๋žŒ์ด ํ•œ ๊ฒƒ๋งŒ)
๋Œ€๋žต ์ดˆ๋‹น: 1216 clicks
ํ˜„์žฌ๋Š”?
2010๋…„-2011๋…„ Netflix API
1๋…„ ์‚ฌ์ด์— ํŠธ๋ž˜ํ”ฝ
20๋ฐฐ ์ฆ๊ฐ€
20B =
20,000,000,000
2017๋…„ ๋ฐฐํ‹€๊ทธ๋ผ์šด๋“œ
6์›”7์ผ์— ๋Œ€๋žต 20๋งŒ
9์›”5์ผ์—๋Š” 100๋งŒ
์šฐ๋ฆฌ๋Š” ์ด๋Ÿฐ ์„œ๋น„์Šค ํŠธ๋ž˜ํ”ฝ
์ฆ๊ฐ€๋ฅผ ๋ฒ„ํ‹ธ ์ˆ˜ ์žˆ์„๊นŒ?
์ฒซ๋ฒˆ์งธ ๊ณ ๋ ค ์‚ฌํ•ญ
1. ์ด ์ •๋„์˜ ์„œ๋น„์Šค ์ฆ๊ฐ€๊ฐ€ ์ผ์–ด๋‚˜๋ฉด ์–ด๋–ป๊ฒŒ ํ•ด์•ผํ• ๊นŒ?
2. ํ•œ๋™์•ˆ ์„œ๋น„์Šค๊ฐ€ ์•ˆ๋œ๋‹ค๋ฉด ์–ด๋–ค ์ผ์ด ๋ฒŒ์–ด์งˆ๊นŒ?
๋Œ€๊ทœ๋ชจ ์„œ๋น„์Šค์˜ ํŠน์„ฑ
Elastic
Resiliency
๋Œ€๊ทœ๋ชจ ์„œ๋น„์Šค์˜ ํŠน์„ฑ
๏ต Elastic
๏ตํŠธ๋ž˜ํ”ฝ์ด๋‚˜ ์ƒํ™ฉ์— ๋”ฐ๋ผ์„œ ์„œ๋ฒ„์˜ ์ถ”๊ฐ€/์ œ๊ฑฐ๊ฐ€ ์‰ฌ์›Œ์•ผ ํ•œ๋‹ค.
๏ต Resiliency
๏ตํŠน์ • ์žฅ๋น„์˜ ์žฅ์•  ๋“ฑ์€ ์ž๋™์œผ๋กœ ๋ณต๊ตฌ๊ฐ€ ๋˜์–ด์•ผ ํ•œ๋‹ค.
๏ต์„œ๋ฒ„๊ฐ€ ๋ณต๊ตฌ๋˜๋Š” ๊ฑด ์•„๋‹˜
๏ตํ•ด๋‹น ์žฅ๋น„์˜ ์žฅ์• ๋กœ ์ธํ•ด ๋‹ค๋ฅธ ์ชฝ์ด ์˜ํ–ฅ ๋ฐ›์ง€ ์•Š์•„์•ผ ํ•จ
Scale Up
VS
Scale Out
Scale Up
์ดˆ๋‹น 1000 TPS
์ดˆ๋‹น 3000 TPS
3๋ฐฐ ์ฒ˜๋ฆฌ ๊ฐ€๋Šฅํ•œ ์„œ๋ฒ„๋ฅผ ํˆฌ์ž…
Scale Out
์ดˆ๋‹น 1000 TPS
์ดˆ๋‹น 2000 TPS
์ดˆ๋‹น 3000 TPS
SPOF
Single Point Of Failure
์—ฌ๊ธฐ์— ์žฅ์• ๊ฐ€ ๋‚˜๋ฉด
์„œ๋น„์Šค ์ „์ฒด๋ฅผ ๋งˆ๋น„์‹œํ‚ค๋Š”
๋ณ‘๋ชฉ์ง€์ 
SPOF
API Server
DB Server
ํ•œ๋Œ€์˜ ๋ฌผ๋ฆฌ ์„œ๋ฒ„
SPOF
API Server
DB Server
ํ•œ๋Œ€์˜ ๋ฌผ๋ฆฌ ์„œ๋ฒ„
SPOF
API Server DB ServerClientClientClient
SPOF
API Server DB ServerClientClientClient
SPOF
API Server DB ServerClientClientClient
SPOF
ClientClientClient
API
Server
API
Server
DB
SPOF
ClientClientClient
API
Server
Master
DB
Slave
DB
Replication
SPOF
ClientClientClient
API
Server
API
Server
API
Server
Master
DB
Slave
DB
Replication
Name Service - DNS
ClientClientClient
API
Server
API
Server
API
Server
Master
DB
Slave
DB
DNS Query Result
Domain IP
www.naver.com 125.209.222.142
202.179.177.21
www.google.com 203.233.96.58
203.233.96.57
203.233.96.56
Name Service - LB
ClientClientClient
API
Server
API
Server
API
Server
L
B
Master
DB
Slave
DB
์–ด๋””๋ฅผ ํ™•์žฅํ•ด์•ผ ํ• ๊นŒ?
API ์„œ๋ฒ„?
DB ์„œ๋ฒ„?
API ์„œ๋ฒ„
๏ต API ์„œ๋ฒ„์—๋งŒ ๋ถ€ํ•˜๊ฐ€ ๋ชฐ๋ฆฌ๋Š” ์ž‘์—…์€ ์–ด๋–ค ๊ฒƒ์ด ์žˆ์„๊นŒ?
๏ตํŒŒ์ผ IO๊ฐ€ ๋งŽ์€, ์ •์  ํŒŒ์ผ ์„œ๋น™
๏ต์›น ์Šคํฌ๋ž˜ํ•‘๊ณผ ๊ฐ™์€ ๋””๋น„ ์ž‘์—… ์ž์ฒด๋ณด๋‹ค๋Š” ๋‹ค๋ฅธ ์ž‘์—…์ด ๋งŽ์€ ๋…€์„๋“ค
๏ต๋…๋ฆฝ์ ์ธ ์ž‘์—…์ด ๊ฐ€๋Šฅํ•œ๋ฐ, CPU๋‚˜ ๋‹ค๋ฅธ ์ž‘์—…์ด ๋งŽ์ด ํ•„์š”ํ•œ
๏ตLOL, ๋ฐฐ๊ทธ๊ฐ™์€ MO ๊ฒŒ์ž„์„œ๋ฒ„
๏ต์ด๋ฏธ์ง€์˜ ์˜์ƒ ์ธ์‹์ด๋‚˜ ์ „์ฒ˜๋ฆฌ ์ด๋Ÿฐ๊ฒƒ๋„โ€ฆ
DB ์„œ๋ฒ„
๏ต ์นดํ†ก๋ฐฉ์˜ ๋Œ€ํ™”๋Š”?
๏ต ํŽ˜์ด์Šค๋ถ์˜ ๊ธ€, ๋Œ“๊ธ€, ์นœ๊ตฌ ๊ด€๊ณ„?
๏ต ์œ ํˆฌ๋ธŒ ๋“ฑ์— ์˜ฌ๋ผ๊ฐ€๋Š” ๋น„๋””์˜ค๋‚˜ ๋Œ“๊ธ€๋“ฑ
๏ต ์ƒ๊ฐ๋ณด๋‹ค ์šฐ๋ฆฌ๊ฐ€ ์•„๋Š” ๋Œ€๋ถ€๋ถ„์ด ์—ฌ๊ธฐ์— ๋ถ€ํ•˜๋ฅผ ์คŒ.
Stateless
State
State
Client API #1
User #1
API #2
User #2
User #3
User #4
State
Client API #1
User #1
API #2
User #2
User #3
User #4
1. 5๋ฒˆ ์œ ์ € ์ถ”๊ฐ€๋˜๋ฉด ์–ด๋””๋กœ ๊ฐ€์•ผํ• ๊นŒ?
State
Client API #1
User #1
API #2
User #2
User #3
User #4
1. ์žฅ์• ๊ฐ€ ๋‚ฌ์„ ๋•Œ User #3, #4์˜ ๋ฐ์ดํ„ฐ๋Š”
์–ด๋””๋กœ?
Stateless
Client API Storage
API
API
API ์„œ๋ฒ„๋Š” ๋น„์ฆˆ๋‹ˆ์Šค ๋กœ์ง๋งŒ ๊ฐ€์ง
์กฐ์‚ผ๋ชจ์‚ฌ?
Client API
StorageAPI
API
ํฌ๊ณ  ์•ˆ์ •์ ์ธ ๋””๋น„๊ฐ€ ํ•„์š”ํ•˜๊ฒŒ ๋จ.
Stateless ํ•œ ์„œ๋ฒ„์˜ ๊ฒฝ์šฐ
๏ต ์žฅ์ 
๏ต์ถ”๊ฐ€/์‚ญ์ œ๊ฐ€ ๊ฐ„๋‹จํ•จ.
๏ต์‚ฌ์šฉํ•˜๋Š” ์ชฝ์—์„œ ์ฃผ์†Œ๋งŒ ์ถ”๊ฐ€ํ•˜๊ฑฐ๋‚˜ ์ œ๊ฑฐํ•˜๋Š” ๊ฑธ๋กœ ๊ฐ€๋Šฅ
๏ตOr ๋กœ๋“œ๋ฐธ๋Ÿฐ์„œ์— ์ถ”๊ฐ€ํ•˜๊ฑฐ๋‚˜ ์ œ๊ฑฐ ํ•˜๊ธฐ๋งŒ ํ•˜๋ฉด OK
๏ต ๋‹จ์ 
๏ต๊ฒฐ๊ตญ ๋ฐ์ดํ„ฐ์˜ ์ €์žฅ์ด ํ•„์š”ํ•˜๋ฏ€๋กœ, ๋’ค์— ์ฑ…์ž„์„ ๋–  ๋„˜๊ธฐ๋Š” ๊ตฌ์กฐ์ž„.
๏ต๊ฐœ๋ณ„ ์„ฑ๋Šฅ์€ Stateful ํ•œ ๊ฒฝ์šฐ๋ณด๋‹ค ๋–จ์–ด์งˆ ์ˆ˜ ์žˆ์Œ
๊ทธ๋Ÿฐ๋ฐ ์™œ Stateless ์ธ๊ฐ€?
๏ต Stateless ํ•œ ์„œ๋ฒ„์— ์‹ ๊ฒฝ์„ ์“ฐ์ง€๋ง๊ณ 
๏ต ์ค‘์š”ํ•œ DB(Storage) ์ชฝ์— ์ง‘์ค‘์„ ํ•˜๋Š”๊ฒŒ ๋” ์ข‹๋‹ค๋ผ๋Š” ํŒ๋‹จ.
๏ต ๋‘ ๋งˆ๋ฆฌ ํ† ๋ผ๋ฅผ ๋‹ค ์ซ“์ง€ ๋ง๊ณ , ํ•œ ๋†ˆ๋งŒ ํŒฌ๋‹ค.
Shard Nothing
API ์„œ๋ฒ„๋Š” Stateless
๊ทธ๋Ÿผ DB๋Š”!!!
์ผ๋ฐ˜์ ์ธ DB ์„œ๋ฒ„์˜ ๋ถ€ํ•˜
200 writes/s
800 reads/s
Read > Write
์ฝ๊ธฐ ๋ถ„๋ฐฐ - Query Off
WEB/AS
Master
Slave
ONLY WRITE
Slave Slave
Only READ
REPLICATION
์ฝ๊ธฐ ๋ถ„๋ฐฐ - Query Off
200
writes/s
800
reads/s
200
writes/s
400
reads/s
200
writes/s
400
reads/s
Read/1 Server Read/2 Server
Slave ์žฅ๋น„๋ฅผ ์ถ”๊ฐ€ํ•˜๋ฉด
๊ณ„์† ์„ฑ๋Šฅ์ด ์ฆ๊ฐ€ํ• ๊นŒ?
์ฝ๊ธฐ ๋ถ„์‚ฐ์˜ ํ•œ๊ณ„
700
writes/s
50
reads/s
700
writes/s
50
reads/s
700
writes/s
50
reads/s
700
writes/s
50
reads/s
700
writes/s
50
reads/s
Write Heavy Situation
Database
Partitioning
Vertical Partitioning
Horizontal Partitioning
Sharding
Horizontal Partitioning
ํŠน์ • Key ๋ฅผ ์–ด๋””์—
์ €์žฅํ•  ๊ฒƒ์ธ๊ฐ€?
ํŠน์ • Key ๋ฅผ ์ €์žฅํ•˜๋Š” ๋ฐฉ๋ฒ•
ํŠน์ • Key ๋ฅผ ์ฐพ๋Š” ๋ฐฉ๋ฒ•
์งˆ๋ฌธ: ์–ด๋–ป๊ฒŒ ๋ฐ์ดํ„ฐ๋ฅผ ๋‚˜๋ˆ ์•ผ ํ• ๊นŒ?
๏ต ๊ฐ€์ • #1
๏ตํ•˜๋‚˜์˜ ์„œ๋ฒ„์—๋Š” ์ตœ๋Œ€ 5๊ฐœ์˜ ๋ฐ์ดํ„ฐ๋งŒ ์ €์žฅ
๏ต1, 2, 3, 4, 5, 6 ์˜ ๋ฐ์ดํ„ฐ๊ฐ€ ์žˆ์„๋•Œ, ์–ด๋–ป๊ฒŒ ๋ฐ์ดํ„ฐ๋ฅผ ๋‚˜๋ˆ ์•ผ
๋ฐ์ดํ„ฐ๋ฅผ ์ž˜ ์ €์žฅํ–ˆ๋‹ค๊ณ  ํ•  ์ˆ˜ ์žˆ์„๊นŒ?
์งˆ๋ฌธ: ์–ด๋–ป๊ฒŒ ๋ฐ์ดํ„ฐ๋ฅผ ๋‚˜๋ˆ ์•ผ ํ• ๊นŒ?
๏ต ๊ฐ€์ • #2
๏ต7,8 ์˜ ๋ฐ์ดํ„ฐ๊ฐ€ ๋” ๋“ค์–ด์™”์„๋•Œ๋Š”?
Range
๏ตํŠน์ • ๋ฒ”์œ„๋Œ€์—ญ์œผ๋กœ ๋‚˜๋ˆ„๊ธฐ
Server #1 Server #2 Server #3
User #1 ~ 100 User #101 ~ 200 User #201 ~ 300
Modular
๏ต์„œ๋ฒ„ ๋Œ€์ˆ˜๋กœ ๋‚˜๋ˆ„๊ธฐ
Server #1 Server #2
0 % 2 = 0 1 % 2 = 1
2 % 2 = 0 3 % 2 = 1
4 % 2 = 0 5 % 2 = 1
Modular
๏ตModular์˜ ๋‹จ์  ํ•œ๋Œ€๊ฐ€ ์ถ”๊ฐ€๋˜๋ฉด?
๏ต๋ฐ์ดํ„ฐ์˜ ์ด๋™์ด ์‹ฌํ•ด์ง„๋‹ค.
Server #1 Server #2
0 % 3 = 0 1 % 3 = 1
Server #3
2 % 3 = 2
3 % 3 = 0 4 % 3 = 1 5 % 3 = 2
6 % 3 = 0 7 % 3 = 1 8 % 3 = 2
Modular
๏ต๋‘๋ฐฐ๋กœ ๋Š˜๋ฆฌ๊ธฐ
๏ต1์—์„œ๋Š” 3์œผ๋กœ ์ ˆ๋ฐ˜์ด, 2์—์„œ๋Š” 4๋กœ ์ ˆ๋ฐ˜์ด ์ด๋™
Server #1 Server #2
0 % 4 = 0 1 % 4 = 1
Server #3 Server #4
2 % 4 = 2 3 % 4 = 3
4 % 4 = 0 5 % 4 = 1 6 % 4 = 2 7 % 4 = 3
8 % 4 = 0 9 % 4 = 1 10 % 4 = 2 1 % 4 = 3
Indexed
๏ตํŠน์ • ๋ฐ์ดํ„ฐ์˜ ์œ„์น˜๋ฅผ ๊ฐ€๋ฆฌํ‚ค๋Š” ์„œ๋ฒ„๊ฐ€ ์กด์žฌ
Server #1 Server #2 Server #3
User #1
Index
User #1 -> 3
User #100 -> 1
User #102 -> 1
User #100
User #102
Complexed
Master
Index
User RANGE #1 -> 1
Slave Slave
Master
Slave Slave
Master
Slave Slave
ONLY WRITE
ONLY READ
User RANGE #10 -> 1
User RANGE #20 -> 3
Consistent Hashing
A
Add A,B,C Server
A
B
Add A,B,C Server
A
B
C
Add A,B,C Server
A
B
C
1
Add Item 1
A
B
C
1
2
Add Item 2
A
B
C
1
2
3
4
5
Add Item 3,4,5
A
B
C
2
3
4
5
Fail!! B Server
A
B
C
1
2
3
4
5
Add Item 1 Again -> Allocated C
Server
A
B
C
1
2
3
4
5
1
Recover B Server -> Add Item 1
C๊ฐ€ ์ฃฝ์œผ๋ฉด A ๋ถ€ํ•˜๊ฐ€ ๋„ˆ๋ฌด
์ปค์ง€์ง€ ์•Š์„๊นŒ์š”?
A
B
C
1
2
3
4
5
1
์˜ˆ์ƒ๋„
๊ทธ๋Ÿฌ๋‚˜ ์‹ค์ œ๋กœ๋Š”?
A
B
C
Real Implementation
A+1
A+2
A+3
B+1
B+2
C+1
C+2
A+
4
C+3
B+3
Consistent Hashing ์˜ ๊ตฌํ˜„ #1
Hash(key) value
Hash(server_1) 100
Hash(server_2) 200
Hash(server_3) 300
๋™์ผํ•œ Hash ํ•จ์ˆ˜๋ฅผ ์‚ฌ์šฉํ•œ๋‹ค๋ฉด, ๊ฐ™์€ KEY์— ๋Œ€ํ•ด์„œ Value๊ฐ€ ๋ฐ”๋€Œ๋Š” ๊ฒฝ์šฐ๊ฐ€ ์žˆ์„๊นŒ?
Consistent Hashing ์˜ ๊ตฌํ˜„ #2
Hash(key) value Server
Hash(Key_1) 50 Server_1
Hash(server_1) 100
Hash(Key_2) 150 Server_2
Hash(server_2) 200
Hash(Key_3) 230 Server_3
Hash(Key_4) 270 Server_3
Hash(server_3) 300
Hash(Key_5) 350 Server_1
ํ•ด์‰ฌ ๊ฐ’์ด ์ž๊ธฐ๋ณด๋‹ค ํฐ๊ฑฐ๋‚˜ ๊ฐ™์€ ์„œ๋ฒ„๋“ค ์ค‘์—์„œ ๊ฐ€์žฅ ๊ฐ€๊นŒ์šด ์„œ๋ฒ„๋กœ KEY๊ฐ€ ํ• ๋‹น๋จ
๋ฉ”์ผ์„œ๋น„์Šค๋ฅผ ํ•œ ๋ฒˆ ์„ค๊ณ„ํ•ด๋ด…์‹œ๋‹ค.
๏ต ์‚ฌ์šฉ์ž๊ฐ€ ๊ฐ€์ž…ํ•˜๋Š” ๊ฒฝ์šฐ
๏ต ์‚ฌ์šฉ์ž๊ฐ€ ๋ฉ”์ผ์„ ์ˆ˜์‹ ํ•˜๋Š” ๊ฒฝ์šฐ
๏ต ์‚ฌ์šฉ์ž๊ฐ€ ๋ฉ”์ผ ๋ฆฌ์ŠคํŠธ๋ฅผ ๋ณด๋Š” ๊ฒฝ์šฐ
๏ต ์‚ฌ์šฉ์ž๊ฐ€ ๋ฉ”์ผ์˜ ์ƒ์„ธ ๋‚ด์šฉ์„ ๋ณด๋Š” ๊ฒฝ์šฐ
์ „์ฒด ๊ฐ€์ •
๏ต ์‚ฌ์šฉ์ž์˜ ๋ฉ”์ผ ์ •๋ณด๋Š” ๋‹ค์Œ๊ณผ ๊ฐ™์ด ๊ฐ๊ฐ ๋ถ„๋ฆฌ๋˜์–ด ์žˆ๋‹ค.
๏ต์‚ฌ์šฉ์ž์˜ ๋ฉ”์ผ ์ˆ˜์‹  ๋ฆฌ์ŠคํŠธ
๏ต๊ฐ ๋ฉ”์ผ์˜ ์‹ค์ œ ํŒŒ์ผ ๋‚ด์šฉ
๏ต ํ•œ ๊ณ„์ •์˜ ๋ฉ”์ผ ๋ชฉ๋ก ์ •๋ณด๋Š” ๋ชจ๋‘ ๊ฐ™์€ DB ์•ˆ์— ์กด์žฌํ•œ๋‹ค.
๏ต์ฆ‰ ํ•œ ๊ณ„์ •์˜ ์ •๋ณด๋Š” ๋ถ„์‚ฐ๋˜์ง€ ์•Š๋Š”๋‹ค.
๏ต EML์„ ์ €์žฅํ•˜๋Š” ๋ถ€๋ถ„์€ AWS S3 ๊ฐ™์€ ์„œ๋น„์Šค๋ฅผ ์ด์šฉํ•œ๋‹ค๊ณ  ๊ฐ€์ •ํ•ฉ๋‹ˆ๋‹ค.
๏ต์—ฌ๊ธฐ์„œ ์„ค๊ณ„๋‚˜ ๊ตฌ์กฐ๋ฅผ ํ˜„์žฌ๋Š” ๋‹ค๋ฃจ์ง€ ์•Š์Šต๋‹ˆ๋‹ค.
์‚ฌ์šฉ์ž๊ฐ€ ๊ฐ€์ž…ํ•˜๋Š” ๊ฒฝ์šฐ #1
๏ต ์–ด๋–ค ๋ฐฉ์‹์„ ๊ณ ๋ คํ•  ๊ฒƒ์ธ๊ฐ€?
๏ตRange
๏ตModular
๏ตIndexed
์‚ฌ์šฉ์ž๊ฐ€ ๊ฐ€์ž…ํ•˜๋Š” ๊ฒฝ์šฐ #2
๏ต ํ•œ๊ตญ์˜ ์‚ฌ์šฉ์ž๋Š” ๋งŽ์•„๋„ 5์ฒœ๋งŒ๋ช…, ๊ณ„์ •์„ 3~4๊ฐœ์”ฉ ๋งŒ๋“ ๋‹ค๊ณ  ํ•˜๋”๋ผ๋„
๏ต 2์–ต๊ฐœ ์ •๋„
๏ต ๋ฉ”๋ชจ๋ฆฌ๊ฐ€ ์ถฉ๋ถ„ํ•œ DBํ•œ๋Œ€๋กœ ์ถฉ๋ถ„ํžˆ ์ปค๋ฒ„๊ฐ€ ๋˜๋Š” ์ˆ˜์ค€
๏ต ๊ณ„์‚ฐ ๋ฐฉ๋ฒ•
๏ต์ด๋ฉ”์ผ ์ฃผ์†Œ : 256 bytes ๊ทธ ์™ธ ์ถ”๊ฐ€ ์ •๋ณด๋กœ 1๊ฐœ๋‹น 1024 bytes ๋ผ๊ณ  ๊ฐ€์ •
๏ต1024 * 2์–ต = 190๊ธฐ๊ฐ€ ์ •๋„๋ฉด ๋ชจ๋‘ ๋ฉ”๋ชจ๋ฆฌ์— ์ €์žฅ๋จ.(๋””์Šคํฌ์— ๊ฐˆ ์ผ๋„ ์—†์Œ.)
๏ต8:2 ๋ฒ•์น™์— ์˜ํ•ด์„œ 20% ์ •๋„๊ฐ€ ๋นˆ๋ฒˆํ•˜๊ฒŒ ์•ก์„ธ์Šค ๋œ๋‹ค๊ณ  ํ•˜๋ฉด 190 * 0.2 = 38G
๏ต64G ์ •๋„ ๋ฉ”๋ชจ๋ฆฌ ๋จธ์‹ ์ด๋ฉด aws m4.4xlarge ์ •๋„ ์‹œ๊ฐ„๋‹น $1, ํ•œ๋‹ฌ์— $720 ์ •๋„ ๋“ฌ.
๏ต์žฅ์•  ๋Œ€๋น„ํ•˜๋ฉด 720 * 2 = $1440 ์ •๋„๋กœ ๊ตฌ์„ฑ ๊ฐ€๋Šฅ(Index ์„œ๋ฒ„๋งŒ)
๏ต์‹ค์ œ๋กœ 1k ๋„ ์•ˆ๋  ๊ฐ€๋Šฅ์„ฑ์ด ํฌ๋ฏ€๋กœ ๋” ์ž‘๊ฒŒ๋„ ๊ตฌ์„ฑ์ด ๊ฐ€๋Šฅํ•จ.
์‚ฌ์šฉ์ž๊ฐ€ ๊ฐ€์ž…ํ•˜๋Š” ๊ฒฝ์šฐ #3
๏ต ์‚ฌ์šฉ์ž์˜ ๋ฉ”์ผ์„œ๋น„์Šค์— ๊ฐ€์ž…ํ•  ๋•Œ, ์‚ฌ์šฉ์ž์˜ ๋ฉ”์ผ ๋ฆฌ์ŠคํŠธ๋ฅผ ์ €์žฅ
ํ•  ์„œ๋ฒ„๋Š” ํ˜„์žฌ ์„œ๋น„์Šค ์ค‘์ธ ์„œ๋ฒ„๋“ค ์ค‘์—์„œ ๊ฐ€์žฅ ์‚ฌ์šฉ๋Ÿ‰์ด ์ ์€ ์„œ
๋ฒ„๋กœ ์„ ํƒ
๏ต์‚ฌ์šฉ๋Ÿ‰์ด ์ ์€ ์„œ๋ฒ„
๏ต๋””์Šคํฌ ์‚ฌ์šฉ๋Ÿ‰, CPU ์‚ฌ์šฉ๋Ÿ‰์ด ์ ์€ ์„œ๋ฒ„
๏ต๊ฐ€์žฅ ํ• ๋‹น๋œ ์‚ฌ์šฉ์ž๊ฐ€ ์ ์€ ์„œ๋ฒ„) ์„œ๋ฒ„ ํ‰๊ท  ์‚ฌ์šฉ๋Ÿ‰(100์ด ํ•œ๊ณ„๋ผ๊ณ  ๊ฐ€์ •)
A 100
B 90
C 70
D 20
์‚ฌ์šฉ์ž๊ฐ€ ๊ฐ€์ž…ํ•˜๋Š” ๊ฒฝ์šฐ #4
๏ต User Table Schema
์ปฌ๋Ÿผ๋ช… ์ถ”์ƒํƒ€์ž… ๋น„๊ณ 
user_id Long(64bit) ์œ ๋‹ˆํฌ ๊ณ ์œ  ์•„์ด๋””(๊ฐ DB๋ณ„)
email String ์ด๋ฉ”์ผ ์ฃผ์†Œ
shard Long ์ž์‹ ์˜ ๋ฉ”์ผ ๋ฆฌ์ŠคํŠธ๋ฅผ ์ €์žฅํ•œ ์„œ๋ฒ„ ๋ฒˆํ˜ธ
type int ํ™œ์„ฑํ™” ์œ ์ €์ธ์ง€, ์•„๋‹ˆ๋ฉด ๋‹ค๋ฅธ ํŠน์ง•์ •๋ณด
created_at timestamp ๊ณ„์ • ์ƒ์„ฑ์‹œ๊ฐ„
last_login_time timestamp ์ตœ์ข…์ ์œผ๋กœ ๋กœ๊ทธ์ธํ•œ ์‹œ๊ฐ„
์‚ฌ์šฉ์ž๊ฐ€ ๋ฉ”์ผ์„ ์ˆ˜์‹ ํ•˜๋Š” ๊ฒฝ์šฐ #1
๏ต ๊ฐ€์ •
๏ต์ˆ˜์‹ ๋ฐ›๋Š” ๋ฉ”์ผ ๋„๋ฉ”์ธ์€ ํ•˜๋‚˜๋กœ ๊ฐ€์ •ํ•œ๋‹ค.(์‚ฌ์‹ค ์—ฌ๋Ÿฌ ๊ฐœ๋ผ๋„ ์ƒ๊ด€์€ ์—†๋‹ค.)
๏ต๋ฉ”์ผ ๋‚ด์šฉ(EML)์€ DB๊ฐ€ ์•„๋‹Œ ๋‹ค๋ฅธ ๊ณณ์— ์ €์žฅ๋œ๋‹ค.
๏ตAWS์˜ S3 ๊ฐ™์€ ๊ฒƒ์„ ์ƒ๊ฐํ•˜์ž.
๏ต๋ฉ”์ผ์„ ๊ฐ€์ ธ๊ฐ€๋Š” ๋ฐฉ๋ฒ•์€, ์ผ๋‹จ ์ˆ˜์‹  ๋ฐ›์€ ์‹œ๊ฐ„ ์ˆœ์œผ๋กœ๋งŒ ๋œ๋‹ค๊ณ  ๊ฐ€์ •ํ•œ๋‹ค.
๏ต์†ก์‹ ์ž ์ˆœ, ๋ฉ”์ผ ์ œ๋ชฉ ์ˆœ, ์ด๋Ÿฐ ๊ฑด ๊ณ ๋ คํ•˜์ง€ ์•Š๋Š”๋‹ค.
์‚ฌ์šฉ์ž๊ฐ€ ๋ฉ”์ผ์„ ์ˆ˜์‹ ํ•˜๋Š” ๊ฒฝ์šฐ #2
๏ต Mails Table Schema
์ปฌ๋Ÿผ๋ช… ์ถ”์ƒํƒ€์ž… ๋น„๊ณ 
mail_id Long(64bit) ์œ ๋‹ˆํฌ ๊ณ ์œ  ์•„์ด๋””(๊ฐ DB๋ณ„)
receiver String or Long ์ˆ˜์‹ ์ž
sender String or Long ์†ก์‹ ์ž
subject String ๋ฉ”์ผ ์ œ๋ชฉ
received_at timestamp ์ˆ˜์‹  ์‹œ๊ฐ„
eml_id String or Long ๋ฉ”์ผ ๋ณธ๋ฌธ ์ €์žฅ id(or url)
is_read boolean ์ฝ์—ˆ๋Š”์ง€ ์—ฌ๋ถ€
contents String ๋ณด์—ฌ์ค„ ๋‚ด์šฉ์˜ ์ผ๋ถ€?(์ค‘์š”ํ•˜์ง€ ์•Š์Œ)
์‚ฌ์šฉ์ž๊ฐ€ ๋ฉ”์ผ์„ ์ˆ˜์‹ ํ•˜๋Š” ๊ฒฝ์šฐ #3
์†ก์‹ ์ž
๋ฉ”์ผ ์„œ๋ฒ„
์ˆ˜์‹ ์ž
๋ฉ”์ผ ์„œ๋ฒ„
๋ฉ”์ผ ์ „์†ก
๋ฉ”์ผ ์ˆ˜์‹ 
User
Service
์ •์ƒ ์œ ์ € ํ™•์ธ
๋ฉ”์ผ ํŒŒ์‹ฑ
๋ฉ”์ผ ๋ฉ”ํƒ€ ์ •๋ณด ์ €์žฅ
DB #1 DB #2 DB #3
Eml
Storage
Eml
Storage
Eml
Storage
eml
Storage
๋ฉ”์ผ ๋ณธ๋ฌธ ์ •๋ณด ์ €์žฅ
์ดํ•ด๋ฅผ ๋•๊ธฐ ์œ„ํ•œ ์•„์ฃผ ์ถ”์ƒ์ ์ธ ๊ตฌ์กฐ์ž…๋‹ˆ๋‹ค.
์‚ฌ์šฉ์ž๊ฐ€ ๋ฉ”์ผ์„ ์ˆ˜์‹ ํ•˜๋Š” ๊ฒฝ์šฐ #4
๏ต EML ์ €์žฅ์„ ์œ„ํ•œ ์„œ๋น„์Šค๊ฐ€ ์ถ”๊ฐ€๋กœ ํ•„์š”.
๏ต AWS S3 ๊ฐ™์€ ๊ฒƒ์„ ์ด์šฉํ•œ๋‹ค๊ณ  ํ•˜๋”๋ผ๋„
๏ต ๊ฒฐ๊ตญ ํ•ด๋‹น EML ํŒŒ์ผ์— ๋Œ€ํ•œ key๋ฅผ ๋ฌด์—‡์„ ํ•  ๊ฒƒ์ธ์ง€๊ฐ€ ์ค‘์š”ํ•จ.
๏ต EX)
๏ต Unique ํ•œ ๊ฐ’์„ ๋งŒ๋“ค์–ด๋‚ผ ์ˆ˜ ์žˆ์–ด์•ผ ํ•œ๋‹ค.
๏ต{receiver_id}_{mail_id}
๏ตMail_id ์ž์ฒด๋กœ๋Š” ๋‚˜๋ˆ ์ง„ shard ๋งˆ๋‹ค ์ค‘๋ณต์ด ์กด์žฌ ๊ฐ€๋Šฅํ•จ.
๏ต{receiver_id}_{mail_id}๋Š” Unique
์‚ฌ์šฉ์ž๊ฐ€ ๋ฉ”์ผ ๋ฆฌ์ŠคํŠธ๋ฅผ ๋ณด๋Š” ๊ฒฝ์šฐ
์‚ฌ์šฉ์ž
Mail
Service
๋ชฉ๋ก ์š”์ฒญ
๋ชฉ๋ก ์ „์†ก
User
Service
์ •์ƒ ์œ ์ € ํ™•์ธ
๋ฉ”์ผ ๋ฆฌ์ŠคํŠธ ์š”์ฒญ
select * from mails where receiver=charsyam order by created_at
desc
DB #1 DB #2 DB #3
์ดํ•ด๋ฅผ ๋•๊ธฐ ์œ„ํ•œ ์•„์ฃผ ์ถ”์ƒ์ ์ธ ๊ตฌ์กฐ์ž…๋‹ˆ๋‹ค.
charsyam: 3
charsyam
๋ฉ”์ผ ๋ฆฌ์ŠคํŠธ ์ „๋‹ฌ
์‚ฌ์šฉ์ž๊ฐ€ ๋ฉ”์ผ์˜ ์ƒ์„ธ ๋‚ด์šฉ์„ ๋ณด๋Š” ๊ฒฝ์šฐ
์‚ฌ์šฉ์ž
Mail
Service
์ดํ•ด๋ฅผ ๋•๊ธฐ ์œ„ํ•œ ์•„์ฃผ ์ถ”์ƒ์ ์ธ ๊ตฌ์กฐ์ž…๋‹ˆ๋‹ค.
charsyam_1
๋ฉ”์ผ ์š”์ฒญ
eml_id ์ „๋‹ฌ
๋ฉ”์ผ ์ƒ์„ธ
์ „๋‹ฌ
Eml
Storage
Eml
Storage
Eml
Storage
eml
Storage
๋ฉ”์ผ EML์„ ์ €์žฅํ•˜๋Š” KEY
๏ต EML ID๋ฅผ ์™œ {receiver}_{mail_id} ๋กœ ํ–ˆ์„๊นŒ?
๏ตKEY๋ฅผ ๋งŒ๋“œ๋Š” ๋ฐฉ๋ฒ•์€ ๊ต‰์žฅํžˆ ๋‹ค์–‘ํ•  ์ˆ˜ ์žˆ์Œ.
๏ต ์ข€ ๋” ์ข‹์€ KEY๋ฅผ ๋งŒ๋“ค ์ˆ˜ ์žˆ์„๊นŒ?
์งˆ๋ฌธ
๏ต EML ID ํ•„๋“œ๊ฐ€ ํ•„์š”ํ• ๊นŒ์š”?
๏ต์ด๋ฏธ receiver ์™€ mail_id๊ฐ€ ์žˆ์œผ๋ฏ€๋กœ ๊ทธ๋ƒฅ ์กฐํ•ฉํ•˜๋ฉด ๋˜์ง€ ์•Š์„๊นŒ?
๏ต ๋ฐ์ดํ„ฐ๋ฅผ ๋‹ค๋ฅธ ์„œ๋ฒ„๋กœ ์ด์ „ํ•ด์•ผ ํ•˜๋Š” ๊ฒฝ์šฐ?
๋‹ค์‹œ ๋Œ์•„์™€์„œ!!!
KEY ์„ค๊ณ„๋ฅผ
์–ด๋–ป๊ฒŒ ํ•  ๊ฒƒ์ธ๊ฐ€?
ํ‚ค๋งŒ ๋ณด๊ณ  ์–ด๋–ค ์„œ๋ฒ„์—์„œ
์ฐพ์•„์•ผ ํ• ์ง€
์•Œ ์ˆ˜ ์žˆ์ง€ ์•Š์„๊นŒ?
Unique ํ•ด์•ผํ•จ
Key๋งŒ ๋ณด๊ณ 
์‹œ๊ฐ„ ์ˆœ์„ ์•Œ ์ˆ˜ ์žˆ์„๊นŒ?
UUID
๏ต Universally Unique Identifier
๏ต 128 bit
๏ต 36 characters
๏ต 123e4567-e89b-12d3-a456-426655440000
UUID์˜ ๋‹จ์ 
๏ต 128 bit๋Š” ๋„ˆ๋ฌด ์šฉ๋Ÿ‰์ด ํฌ๋‹ค.
๋ณดํ†ต Shard ID ๊ฐ€ ๋“ค์–ด๊ฐ
Shard ID์™€
์‹ค์ œ ์„œ๋ฒ„์˜ ๋งคํ•‘
์‹œ๊ฐ„ ์ •๋ณด๊ฐ€ ๋“ค์–ด๊ฐ€๋ฉด ID
๋งŒ์œผ๋กœ ์‹œ๊ฐ„ ์ •๋ ฌ์ด ๊ฐ€๋Šฅ
๋ญ”๊ฐ€ ๋ณ€ํ™”ํ•˜์ง€ ์•Š์„ ํŠน๋ณ„
ํ•œ ์ •๋ณด๊ฐ€ ์žˆ๋‹ค๋ฉด ID์—
๋“ค์–ด๊ฐ€ ์žˆ์œผ๋ฉด ์ข‹์Œ.
์˜คํ”ˆ ์ฑ„ํŒ…
๋‹จํ†ก๋ฐฉ
๊ทธ๋ฃน์ฑ„ํŒ…๋ฐฉ
๋น„๋ฐ€์ฑ„ํŒ…๋ฐฉ
ํ•„์š” ์ •๋ณด๋“ค
๏ต ์‹œ๊ฐ„์ •๋ณด(Timestamp)
๏ตTimestamp ๋Š” 1970๋…„ 1/1์ผ ๊ธฐ์ค€, ์šฐ๋ฆฌ๋Š” 2018๋…„ ๋ถ€ํ„ฐ ์‹œ์ž‘ํ•ด๋„โ€ฆ
๏ต์–ธ์ œ๊นŒ์ง€์˜ ์‹œ๊ฐ„ ์ •๋ณด๊ฐ€ ํ•„์š”ํ• ๊นŒ?
๏ต4byte๋ฅผ ๋‹ค ์“ฐ๋ฉด 2106๋…„ 2/7์ผ 06:28๋ถ„ ๊นŒ์ง€ ์ปค๋ฒ„๋จ(32bit)
๏ต ์ฑ„ํŒ…๋ฐฉ ์ •๋ณด
๏ต Shard ์ •๋ณด
{TIMESTAMP}_{SHARD_ID}_{TYPE}_{SEQUENCE}
KEY์˜ ์„ค๊ณ„ #1
๏ต Simple ๋ฒ„์ „
๏ต64bit = 8 bytes
๏ต๊ธฐ์กด userid ๋ฅผ ์ƒ์„ฑ๋˜๋Š” key ์™€ ๋ถ™์—ฌ์„œ ์‚ฌ์šฉํ•˜๋Š” ๋ฐฉ๋ฒ•
๏ต6209324585984
๏ตTimestamp = 6209324585984 >> 12 =
1515948385
๏ตSequence = 6209324585984 & 0xFFF = 1024
๏ตcharsyam_ 6209324585984
Timestamp sequence
52 bits 12 bits = 4096
KEY์˜ ์„ค๊ณ„ #2
Client Service
KEY ์ „์†ก User
Service
์ •์ƒ ์œ ์ € ํ™•์ธ
KEY ํŒŒ์‹ฑ
DB #1 DB #2 DB #3
์ดํ•ด๋ฅผ ๋•๊ธฐ ์œ„ํ•œ ์•„์ฃผ ์ถ”์ƒ์ ์ธ ๊ตฌ์กฐ์ž…๋‹ˆ๋‹ค.
charsyam_6209324585984 charsyam
Shard : 3
KEY 6209324585984 ์š”์ฒญ
๊ฐ ์œ ์ €์˜ ๋ฐ์ดํ„ฐ๋Š” ๊ฐ ์œ ์ €๊ฐ€ ์ง€์ •๋œ Shard
์ด์™ธ์—๋Š” ์ €์žฅ๋  ์ˆ˜ ์—†๋‹ค.
๋ฐ์ดํ„ฐ๋Š” ์„œ๋กœ ๋‹ค๋ฅธ ์„œ๋ฒ„
๋กœ ๋‚˜๋ˆ ์งˆ ์ˆ˜ ์žˆ๋‹ค๋ฉด?
KEY์˜ ์„ค๊ณ„ #3
๏ต ์•ฝ๊ฐ„ ๋ณต์žกํ•ด์ง„ ๋ฒ„์ „
๏ต64bit = 8 bytes
๏ต6209324585984
๏ตTimestamp = 6209324585984 >> 20 =
1515948385
๏ตShard Id = (6209324585984 & 0xFFF000) >>
12 = 2048
๏ตSequence = 6209324585984 & 0xFFF = 1024
Timestamp Shard ID sequence
40 bits 12 bits = 4096 12 bits = 4096
KEY์˜ ์„ค๊ณ„ #4
Client Service
KEY ์ „์†ก
KEY ํŒŒ์‹ฑ
DB #1 DB #2 DB #3
์ดํ•ด๋ฅผ ๋•๊ธฐ ์œ„ํ•œ ์•„์ฃผ ์ถ”์ƒ์ ์ธ ๊ตฌ์กฐ์ž…๋‹ˆ๋‹ค.
6209324585984
KEY 6209324585984 ์š”์ฒญ
6209324585984 = Shard ID 2048
Shard Server
โ€ฆโ€ฆ. โ€ฆโ€ฆ
โ€ฆโ€ฆ DB #1
2048 DB #2
โ€ฆโ€ฆ DB #3
โ€ฆโ€ฆ โ€ฆโ€ฆ
Check Shard Map
IDC ๊ฐ€ ๋‹ค๋ฅด๋‹ค๋ฉด?
Twitter์˜ ID
Instagram ์˜ ID
MongoDB ์˜ ID
Service Discovery
Client Side VS Server Side
Client Side
ClientClient์˜ˆ์•ฝ
Server
๊ฒฐ์ œ
Server
๊ฒฐ์ œ
Server
๊ฒฐ์ œ
Server
์˜ˆ์•ฝ ์„œ๋ฒ„๊ฐ€ ๊ฒฐ์ œ ์„œ๋ฒ„๋ฅผ ํ˜ธ์ถœํ•œ๋‹ค๊ณ  ํ•˜๋ฉด?
1
2
3
Server Side
ClientClient์˜ˆ์•ฝ
Server
๊ฒฐ์ œ
Server
๊ฒฐ์ œ
Server
๊ฒฐ์ œ
Server
์˜ˆ์•ฝ ์„œ๋ฒ„๊ฐ€ ๊ฒฐ์ œ ์„œ๋ฒ„๋ฅผ ํ˜ธ์ถœํ•œ๋‹ค๊ณ  ํ•˜๋ฉด?
Proxy
LB
์„œ๋ฒ„๋“ค์˜ ๋ชฉ๋ก์€
์–ด๋””์„œ ๊ฐ€์ ธ์˜ฌ๊นŒ?
์„œ๋ฒ„์˜ ์ถ”๊ฐ€
์„œ๋ฒ„์˜ ์‚ญ์ œ(์žฅ์• )
์งˆ๋ฌธ
๏ต ์–ด๋–ค ์„œ๋น„์Šค๊ฐ€ ์ •์ƒ์ธ์ง€ ์•Œ์•„๋ณด๋Š” HealthChecker๋ฅผ ๋งŒ๋“ ๋‹ค๊ณ 
๊ฐ€์ •ํ•ฉ๋‹ˆ๋‹ค.
๏ต http://api.bob.com/health ๋ฅผ ํ˜ธ์ถœํ•ด์„œ ์ฒดํฌํ•œ๋‹ค๊ณ  ํ•˜๋ฉด,
HealthChecker๊ฐ€ ์ •์ƒ์ด๋ผ๋Š” ๊ฑด ์–ด๋–ป๊ฒŒ ๋ณด์žฅํ•  ์ˆ˜ ์žˆ์„๊นŒ์š”?
๊ฐ„๋‹จํ•œ ๋ฐฉ๋ฒ•?
HealthChecker๋ฅผ ์ฒดํฌํ•˜๋Š” HealthChecker๋ฅผ ๋‘์ž? ์–ธ์ œ๊นŒ์ง€?
API ์„œ๋ฒ„
Health
Checker #1
Health
Checker #2
โ€ฆโ€ฆ
Health
Checker #N
์งˆ๋ฌธ
ClientClient์˜ˆ์•ฝ
Server
๊ฒฐ์ œ
Server
๊ฒฐ์ œ
Server
๊ฒฐ์ œ
Server
๊ฒฐ์ œ ์„œ๋ฒ„๊ฐ€ ์ถ”๊ฐ€/์‚ญ์ œ ๋ ๋•Œ LB๋ฅผ ์“ธ ์ˆ˜ ์—†๋‹ค๋ฉด ์–ด๋–ป๊ฒŒ ํ•ด์•ผ ํ• ๊นŒ?
๊ฒฐ์ œ
Server
Coordinator
๏ตZookeeper
๏ตEtcd
๏ตConsul
๏ตEureka
Zookeeper Data Model
๊ทธ๋ƒฅ
๋””๋ ‰ํ† ๋ฆฌ
Zookeeper ์˜ ํŠน์ง•
๏ต ์ ˆ๋Œ€๋กœ ์ฃฝ์ง€์•Š๋Š”๋‹ค.(๊ฑฐ์ง“๋ง)
๏ต์ž˜ ์•ˆ์ฃฝ๋Š”๋‹ค.(๋ช‡๋Œ€ ์ฃฝ์–ด๋„ ์ƒ๊ด€์€ ์—†๋‹ค.)
๏ต๊ทธ๋Ÿฌ๋‚˜ ๋‹ค ์ฃฝ์„๋•Œ๋„ ์ข…์ข… ์žˆ์Œ.
๏ต ์ž„์‹œ ๋…ธ๋“œ์˜ ๊ฒฝ์šฐ, Health Check๋ฅผ ํ†ตํ•ด์„œ ์ž๋™์ ์œผ๋กœ ์ ‘์†๋œ ๋…ธ
๋“œ๊ฐ€ ์‚ฌ๋ผ์ง€๋ฉด ๋ฐ์ดํ„ฐ๊ฐ€ ์‚ฌ๋ผ์ง„๋‹ค.(30์ดˆ๊ฐ€ ๊ธฐ๋ณธโ€ฆ)
๏ตCluster Membership
๏ต ๋…ธ๋“œ์˜ ์ˆœ์„œ๋ฅผ ๋ณด์žฅํ•ด์ค€๋‹ค.
๏ตLeader Election
Leader Election
Cluster Membership
Zookeeper
Ephemeral Node
์„œ๋ฒ„์™€์˜ ์—ฐ๊ฒฐ์ด ๋Š์–ด์ง€๋ฉด
๋…ธ๋“œ ์ •๋ณด๋„ ์‚ฌ๋ผ์ง
์งˆ๋ฌธ #1์„ ๋‹ค์‹œ ์‚ดํŽด๋ณด์ž : HealthCheck
๊ทธ๋ƒฅ API ์„œ๋ฒ„๋ฅผ ์ฒดํฌํ•˜๋Š” HealthCheck๋ฅผ ์—ฌ๋Ÿฌ ๋Œ€ ๋‘์ž.
API ์„œ๋ฒ„
Health
Checker #1
Health
Checker #2
Health
Checker #3
์งˆ๋ฌธ #1์„ ๋‹ค์‹œ ์‚ดํŽด๋ณด์ž : HealthCheck
์žฅ์• ๊ฐ€ ๋‚˜๋ฉด ์žฅ์•  ์•Œ๋žŒ์ด ๋ช‡ ๊ฐœ๋‚˜ ๊ฐ€๊ฒŒ ๋ ๊นŒ?
API ์„œ๋ฒ„
Health
Checker #1
Health
Checker #2
Health
Checker #3
์—ฌ๋Ÿฌ ๋Œ€ ๊ฐ€ ์žˆ์ง€๋งŒ,
ํ•œ ๋Œ€๋งŒ ๋™์ž‘ํ•˜๋ฉด ์ข‹๊ฒ ์–ดโ€ฆ
์งˆ๋ฌธ #1์„ ๋‹ค์‹œ ์‚ดํŽด๋ณด์ž : HealthCheck
Leader ๋งŒ ๋™์ž‘
API ์„œ๋ฒ„
Health
Checker #1
Health
Checker #2
Health
Checker #3
Leader
Leader Election
์—ฌ๋Ÿฌ ๋Œ€์˜ ์„œ๋ฒ„ ์ค‘์—์„œ
ํ•œ๋Œ€๋งŒ ๊ทธ ์ผ์„
ํ•˜๊ฒŒ ํ•˜๊ณ  ์‹ถ์„ ๋•Œ
(or ๋ถ„์‚ฐ Lock)
Leader Election
ํด๋ผ์ด์–ธํŠธ๋“ค ๊ฐ„์˜ ์•ฝ์†์œผ๋กœ ์ •ํ•ด๋‘ .
์งˆ๋ฌธ #2์„ ๋‹ค์‹œ ์‚ดํŽด๋ณด์ž #1
ClientClient์˜ˆ์•ฝ
Server
๊ฒฐ์ œ
Server
๊ฒฐ์ œ
Server
๊ฒฐ์ œ
Server
์„œ๋ฒ„๋ชฉ๋ก ์ •๋ณด๋ฅผ ๋ฐ”๊ฟ”์„œ ์žฌ๋ฐฐํฌ ํ•˜๋Š” ๋ฐฉ๋ฒ•
๊ฒฐ์ œ
Server
๊ทธ๋Ÿฌ๋ฉด ์‚ฌ๋žŒ ์†์ด ๋“ค์–ด๊ฐ‘๋‹ˆ๋‹ค.
Cluster Membership
๏ต Cases
๏ตAPI Server ๊ฐ€ ์ถ”๊ฐ€/๋ณ€๊ฒฝ ๋˜์—ˆ๋‹ค.
๏ตDatabase Master ์žฅ๋น„๊ฐ€ ์ถ”๊ฐ€/๋ณ€๊ฒฝ๋˜์—ˆ๋‹ค.
๏ตCache ์žฅ๋น„๊ฐ€ ์ถ”๊ฐ€/๋ณ€๊ฒฝ ๋˜์—ˆ๋‹ค.
๏ต ์šฐ๋ฆฌ์˜ ๋Œ€์‘์€?
๏ต๋ชฉ๋ก์„ ์ถ”๊ฐ€ํ•˜๊ณ , ๋ฐฐํฌํ•ด์•ผ ํ•ฉ๋‹ˆ๋‹ค.
๏ต๋ชฉ๋ก๋งŒ ์ถ”๊ฐ€ํ•˜๋ฉด ์•Œ์•„์„œ ๋™์ž‘ํ•ฉ๋‹ˆ๋‹ค.
๏ต์žฅ๋น„๋งŒ ์ถ”๊ฐ€ํ•˜๋ฉด ์•Œ์•„์„œ ๋™์ž‘ํ•ฉ๋‹ˆ๋‹ค.
ํ•ด๋‹น ๋…ธ๋“œ์˜ Child ์ •๋ณด๋งŒ
์ฝ์–ด์™€์„œ ์ ‘์†ํ•˜๋ฉด
๋ชฉ๋ก ๊ด€๋ฆฌ ๊ฐ€๋Šฅ
Zookeeper Event Notification #1
zookeeper
์˜ˆ์•ฝ ์„œ๋ฒ„
์˜ˆ์•ฝ ์„œ๋ฒ„
์˜ˆ์•ฝ ์„œ๋ฒ„๊ฒฐ์ œ ์„œ๋ฒ„
๊ฒฐ์ œ ์„œ๋ฒ„
/znode/payment/
znode_0000001
znode_0000002
์„œ๋ฒ„ ์‹œ์ž‘์‹œ
/znode/payment/
์— ์ž„์‹œ ๋…ธ๋“œ ๋“ฑ๋ก
Zookeeper Event Notification #1
zookeeper
ํŠน์ • znode ๋ณ€๊ฒฝ
์„œ๋ฒ„ ์ถ”๊ฐ€/์‚ญ์ œ/๋ณ€๊ฒฝ
์˜ˆ์•ฝ ์„œ๋ฒ„
์˜ˆ์•ฝ ์„œ๋ฒ„
์˜ˆ์•ฝ ์„œ๋ฒ„๊ฒฐ์ œ ์„œ๋ฒ„ #1
๊ฒฐ์ œ ์„œ๋ฒ„ #2
/znode/payment/
znode_0000001
znode_0000002
๊ฒฐ์ œ ์„œ๋ฒ„ #2
znode_0000003
ํŠน์ • node ๋ณ€๊ฒฝ ์ด๋ฒคํŠธ
/znode/payment/
๋ฅผ ๋‹ค์‹œ ์ฝ์–ด์„œ ์„œ๋ฒ„๋กœ
์ ‘์†
์šฉ์–ด
๏ต Release/Deploy/Delivery
๏ต์ƒˆ๋กœ์šด ๊ธฐ๋Šฅ์„ ์ถœ์‹œ/๋ฐฐํฌ ํ•˜๋Š” ๊ฒƒ์„ ์˜๋ฏธ
๏ต Rollback
๏ต์ƒˆ๋กœ์šด ๊ธฐ๋Šฅ ๋ฐฐํฌ์— ๋ฌธ์ œ๊ฐ€ ์žˆ์„ ๋•Œ, ์ด์ „ ๋ฒ„์ „์œผ๋กœ ๋˜๋Œ๋ฆฌ๋Š” ๊ฒƒ์„ ์˜๋ฏธ
์งˆ๋ฌธ
๏ต ์ƒˆ๋กœ์šด ๊ธฐ๋Šฅ์„ ๋ฐฐํฌํ–ˆ๋Š”๋ฐ, ๋ฌธ์ œ๊ฐ€ ๋ฐœ์ƒํ–ˆ์Šต๋‹ˆ๋‹ค.
๏ตํ•ด๋‹น ์ฆ์ƒ์„ ์ œ๊ฑฐํ•  ์ˆ˜ ์žˆ๋Š” ๋ฐฉ๋ฒ•์—๋Š” ์–ด๋–ค ๊ฒƒ๋“ค์ด ์žˆ์„๊นŒ์š”?
๏ตEx) ๋ฒ„๊ทธ ์ˆ˜์ • ํ›„ ์žฌ ๋ฐฐํฌ, ๋กค๋ฐฑ
์งˆ๋ฌธ
๏ต ๋งŒ์•ฝ์— ํ•œ๋ฒˆ ๋ฐฐํฌํ•  ๋•Œ ๋งˆ๋‹ค ๋ช‡ ์‹œ๊ฐ„์”ฉ ๊ฑธ๋ฆฐ๋‹ค๋ฉด?
Feature Flag(Feature Toggle)
๏ต๊ธฐ๋Šฅ Feature๋ฅผ ๋™์ ์œผ๋กœ ๋„๊ณ  ์ผค ์ˆ˜ ์žˆ๋Š” ๋ฐฉ์‹
๏ตEx)
๏ต์นด์นด์˜คํ†ก ๋Œ€ํ™”๋ฐฉ์˜ ๋ˆˆ์€ ์–ด๋–ค ์กฐ๊ฑด์œผ๋กœ ๋‚ด๋ฆฌ๊ธฐ ์‹œ์ž‘ํ• ๊นŒ?
๏ต์ด๋Ÿฐ ๊ธฐ๋Šฅ์„ ์ œ๊ณตํ•˜๊ธฐ ์œ„ํ•ด์„œ ์ค€๋น„ํ•ด์•ผ ํ•˜๋Š” ๊ฒƒ์€?
๊ทธ๋Ÿฌ๋‚˜
ํ›จ์”ฌ ์ค‘์š”ํ•œ ๊ฒƒ๋“ค
์ข‹์€ ์—”์ง€๋‹ˆ์–ด๊ฐ€ ๋˜๊ธฐ ์œ„ํ•ด์„œ
๋™๋ฃŒ๋“ค์—๊ฒŒ ์˜ฌ๋ฐ”๋ฅธ ์งˆ๋ฌธํ•˜๊ธฐ
๏ต ์งˆ๋ฌธ์„ ํ•˜๊ธฐ ์œ„ํ•ด์„œโ€ฆ
๏ต ๋ฌธ์ œ์˜ ์ฆ์ƒ์„ ์ •๋ฆฌ
๏ต ์–ด๋–ค ์˜ค๋ฅ˜๊ฐ€ ๋‚˜์˜ค๋Š”์ง€
๏ต ์ž์‹ ์ด ์ •๋ง ์•Œ๊ณ ์ž ํ•˜๋Š” ๊ฒƒโ€ฆ
๏ต ์ž์‹ ์ด ์‹œ๋„ํ•œ ๋ฐฉ๋ฒ•โ€ฆ
์˜ฌ๋ฐ”๋ฅธ ๋‹ต๋ณ€ ์ ์šฉํ•˜๊ธฐ
๏ต ์•Œ๋ ค์ค€ ๋ฐฉ๋ฒ•์œผ๋กœ ๋ฌธ์ œ๊ฐ€ ํ•ด๊ฒฐ๋œ๋‹ค๋ฉด
๏ต ๋ฌธ์ œ์˜ ๊ทผ๋ณธ์ ์ธ ์›์ธ์€ ๋ฌด์—‡์ธ๊ฐ€?
๏ต ์•Œ๋ ค์ค€ ํ•ด๊ฒฐ์ฑ…์€ ์–ด๋””์— ์ ์šฉ๋˜๋Š”๊ฐ€?
๏ต ์˜ต์…˜์„ ์ถ”๊ฐ€ํ•˜์„ธ์š”.
๏ต ๊ทธ ์˜ต์…˜์„ ์•Œ๊ณ ๋งŒ ๋๋‚  ๊ฒƒ์ธ๊ฐ€?
๏ต ๊ทธ ์˜ต์…˜์ด ์–ด๋–ป๊ฒŒ ๋™์ž‘ํ•˜๋Š”์ง€๋ฅผ ์™„์ „ํžˆ ์ดํ•ดํ•˜๊ณ  ์œ ์‚ฌํ•œ ๋ฌธ์ œ๋ฅผ ํ•ด
๊ฒฐ ํ•  ์ˆ˜ ์žˆ์„๊ฒƒ์ธ๊ฐ€?
์ž๋™ํ™”(Automation)
๏ต ์‚ฌ๋žŒ์˜ ์†์œผ๋กœ ๋ฐ˜๋ณตํ•ด์•ผ ํ•˜๋Š” ๋ถ€๋ถ„๋“คโ€ฆ
๏ต ๋กœ๊ทธ์—์„œ ํŠน์ • ํ‚ค์›Œ๋“œ ๊ฒ€์ƒ‰
๏ต ํŠน์ • ํ‚ค์›Œ๋“œ ๋ณ€ํ™˜๋“ฑ
๏ต ์„ธ๋ฒˆ ์ด์ƒ ํ•˜๊ฒŒ ๋˜๋ฉด, ์ž๋™ํ™”
๋ฌธ์„œํ™”์™€ ๊ณต์œ 
๏ต ๋‚ด๊ฐ€ ๋ฌธ์ œ๋ฅผ ํ•ด๊ฒฐํ•œ ๊ฒƒ๋งŒ์œผ๋กœ๋Š” ๋ชจ๋“  ๊ฒƒ์ด ํ•ด๊ฒฐ๋ ๊นŒ?
๏ต ๋‚ด๊ฐ€ ํ•ด๊ฒฐํ•œ ๋ฐฉ๋ฒ•์œผ๋กœ ํŒ€์˜ ๋ˆ„๊ตฌ๋‚˜ ํ•ด๊ฒฐํ•  ์ˆ˜ ์žˆ๋‹ค๋ฉด?
๏ต๋‚˜๋Š” ์ด์ œ ์ด ๋ฌธ์ œ๋ฅผ ๋˜์ง€๊ณ  ์ƒˆ๋กœ์šด ์žฌ๋ฏธ๋‚œ ๋ฌธ์ œ๋กœโ€ฆ
๏ต ๋ฌธ์„œํ™”
๏ต์›์ธ/์ฆ์ƒ/ํ•ด๊ฒฐ์ฑ…(Opertaion)
๏ต ๊ทธ๋ฆฌ๊ณ  ๊ณต์œ 
๏ต๋ฐœํ‘œ ๋ฐ ๋ฌธ์„œ ์œ„์น˜ ๊ณต์œ 
ํ•ญ์ƒ ํ˜ธ๊ธฐ์‹ฌ์„ ๊ฐ€์ง€์„ธ์š”.
Thank you.

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์„œ๋ฒ„ํ•™๊ฐœ๋ก (๋ฐฑ์—”๋“œ ์„œ๋ฒ„ ๊ฐœ๋ฐœ์ž๋ฅผ ์œ„ํ•œ)
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๋น ๋ฅด๊ณ  ์•ˆ์ „ํ•˜๊ฒŒ ๊ฐ„ํŽธํ•œ AWS๋กœ ๋ฐ์ดํ„ฐ ๋งˆ์ด๊ทธ๋ ˆ์ด์…˜ ํ•˜๊ธฐ::์ตœ์œ ์ • (AWS ์†”๋ฃจ์…˜์ฆˆ์•„ํ‚คํ…ํŠธ)
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