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Scalable
(dkmoon@ifunfactory.com)
2018 iFunFactory Dev Day
Scalability?
Scalability is the capability of a system, network, or process
to handle a growing a...
2018 iFunFactory Dev Day
Scalability?
Scalability is the capability of a system, network, or process
to handle a growing a...
2018 iFunFactory Dev Day
Scalability Question in Gaming
Q) ?
2018 iFunFactory Dev Day
...
2018 iFunFactory Dev Day
Scalability Question in Gaming
Q) ?
Q) ?
2018 iFunFactory Dev Day
Scalability Question in Gaming
Q) ?
Q) ?
A1)
2018 iFunFactory Dev Day
Scalability Question in Gaming
Q) ?
Q) ?
A1)
A2)
2018 iFunFactory Dev Day
Contents.
01
02
03
04 /
05 DB
2018 iFunFactory Dev Day
Offhand Approach
“Scale-up”
SW HW
2018 iFunFactory Dev Day
Scale-up

for High Per-server Capacity
Pros:
(SW)
2018 iFunFactory Dev Day
Scale-up

for High Per-server Capacity
Pros:
(SW)
(via container/VM)
2018 iFunFactory Dev Day
Intel Xeon E5-46XX v4 Family Retail Prices

(Launched in Q2’16)
USD 0
USD 2000
USD 4000
USD 6000
...
2018 iFunFactory Dev Day
Scale-up

for High Per-server Capacity
Cons:
2018 iFunFactory Dev Day
Scale-up

for High Per-server Capacity
Cons:
HW
2018 iFunFactory Dev Day
Scale-up

for High Per-server Capacity
Cons:
HW
2018 iFunFactory Dev Day
Harmonious Approach
“ SW ”
2018 iFunFactory Dev Day
Golden Rule
Minimize Inefficiency
Maximize Concurrency
2018 iFunFactory Dev Day
Inefficiency = Wasting CPU time
2018 iFunFactory Dev Day
Inefficiency = Wasting CPU time
2018 iFunFactory Dev Day
Inefficiency = Wasting CPU time
2018 iFunFactory Dev Day
Inefficiency = Wasting CPU time
) Indexing vs. Looping
Guide #1.
big O
coefficient
Guide #2. Busy...
2018 iFunFactory Dev Day
Code Efficiency vs. Readability
Q) 10%
50% ?
2018 iFunFactory Dev Day
Readability = Reliability
=
=
= @_@/
( , !)
2018 iFunFactory Dev Day
Efficiency vs. Readability
trade-off
➡ efficiency
2018 iFunFactory Dev Day
Concurrency
( ..)
2018 iFunFactory Dev Day
Concurrency Units
Threads (preemptive or cooperative)
Processes (local or remote)
2018 iFunFactory Dev Day
More Units != More Concurrency
By Benjamin D. Esham / Wikimedia Commons, CC BY-SA 3.0

https://co...
2018 iFunFactory Dev Day
Concurrency
( ..)
2018 iFunFactory Dev Day
For Better Concurrency
,
Blocking
2018 iFunFactory Dev Day
For Better Concurrency
Guide #1.
Guide #2.
2018 iFunFactory Dev Day
Concurrency Control
Concurrent
sequential
2018 iFunFactory Dev Day
Concurrency Control
Concurrent
sequential
➡ Shared data
2018 iFunFactory Dev Day
Pessimistic Concurrency Control
2018 iFunFactory Dev Day
Pessimistic Concurrency Control
•
• Shared data
• ) lock

RDBMS xaction
2018 iFunFactory Dev Day
Optimistic Concurrency Control
•
• Shared data ,



Roll-back & retry
2018 iFunFactory Dev Day
Q) ? DBMS ?
Optimistic Concurrency Control
2018 iFunFactory Dev Day
Q) ? DBMS ?
A) ?
Optimistic Concurrency Control
2018 iFunFactory Dev Day
synchronization primitive
primitive
Optimistic CC ( )
2018 iFunFactory Dev Day
Pessimistic CC ( - )
Shared ObjectThread A Thread B
Write Lock
Read
Write
Unlock
Process Locked
2018 iFunFactory Dev Day
Pessimistic CC ( - )
Shared ObjectThread A Thread B
Write Lock
Read
Write
Unlock
Process Locked
R...
2018 iFunFactory Dev Day
Optimistic CC ( - )
Shared ObjectThread A Thread B
Read Lock
Read (Rev=1)
Commit (Rev=1)
Unlock
P...
2018 iFunFactory Dev Day
Optimistic CC ( - )
Shared ObjectThread A Thread B
Read Lock
Read (Rev=1)
Commit (Rev=1)
Unlock
P...
2018 iFunFactory Dev Day
Pessimistic CC ( - )
Shared ObjectThread A Thread B
Write Lock
Read
Write
Unlock
Process Locked
W...
2018 iFunFactory Dev Day
Optimistic CC ( - )
Read Lock
Read (Rev=1)
Commit (Rev=1)
Unlock
Process
Locked
Write Lock
Unlock...
2018 iFunFactory Dev Day
Optimistic CC ( - )
Read Lock
Read (Rev=1)
Commit (Rev=1)
Unlock
Process
Locked
Write Lock
Unlock...
2018 iFunFactory Dev Day
Optimistic CC ( - )
Read Lock
Read (Rev=1)
Commit (Rev=1)
Unlock
Process
Locked
Write Lock
Unlock...
2018 iFunFactory Dev Day
Pessimistic CC vs. Optimistic CC
2018 iFunFactory Dev Day
Pessimistic CC vs. Optimistic CC
Pessimistic Optimistic
Low contention
High contention progress
r...
2018 iFunFactory Dev Day
•High contention
•Low contention
Pessimistic CC vs. Optimistic CC
➡ Pessimistic
➡ Optimistic
2018 iFunFactory Dev Day
Optimistic CC ( )
•
• in-game 

( : )
2018 iFunFactory Dev Day
Optimistic CC ( )
•
• in-game 

( : )
•
2018 iFunFactory Dev Day
Key Questions…
• workload ?
2018 iFunFactory Dev Day
Key Questions…
• workload ?
• ?
2018 iFunFactory Dev Day
Key Questions…
• workload ?
• ?
• ?
2018 iFunFactory Dev Day
Key Questions…
• workload ?
• ?
• ?
• ?
2018 iFunFactory Dev Day
Workload Distribution
Domain-
agnostic
Domain-
specific
2018 iFunFactory Dev Day
Domain-agnostic Distribution
instance
stateless processing unit
) web server scaling 

PUBG
2018 iFunFactory Dev Day
Domain-specific Distribution
in-memory state
) RPG 

,
2018 iFunFactory Dev Day
Workload Distribution
Domain-Agnostic Domain-Specific
state
Scale-out
reconfiguration
State
DB/Ca...
2018 iFunFactory Dev Day
Workload Distribution Guideline
2018 iFunFactory Dev Day
Workload Distribution Guideline
2018 iFunFactory Dev Day
Workload Distribution Guideline
✓ Concurrency 

• Unit: thread → (remote) process
2018 iFunFactory Dev Day
Workload Distribution Guideline
✓ Concurrency 

• Unit: thread → (remote) process
➡ , blocking
2018 iFunFactory Dev Day
Dos & Don’ts
✓
✓ : Lobby vs. Room → specific

Room instances → agnostic
2018 iFunFactory Dev Day
Dos & Don’ts
✓
✓ : Lobby vs. Room → specific

Room instances → agnostic
✓ Stateless stateful
✓ St...
2018 iFunFactory Dev Day
Static Peer Configuration
Pros
•
•
2018 iFunFactory Dev Day
Static Peer Configuration
Cons
• Dev Live
• Live
2018 iFunFactory Dev Day
Dynamic Peer Discovery
• registry 

: Zookeeper, Redis, DB, …
•
• RPC endpoint
• Server tags
2018 iFunFactory Dev Day
Dynamic Peer Discovery
RPC=<IP, port>
TAGS=[“lobby”]
2018 iFunFactory Dev Day
Dynamic Peer Discovery
RPC=<IP, port>
TAGS=[“lobby”]
RPC=<IP, port>
TAGS=[“game”, “chobo"]
2018 iFunFactory Dev Day
Dynamic Peer Discovery
RPC=<IP, port>
TAGS=[“lobby”]
RPC=<IP, port>
TAGS=[“game”, “chobo"]
2018 iFunFactory Dev Day
Dynamic Peer Discovery
RPC=<IP, port>
TAGS=[“lobby”]
RPC=<IP, port>
TAGS=[“game”, “chobo"]
2018 iFunFactory Dev Day
Pitfall: DB as Sync Point
DB
•
• atomicity
2018 iFunFactory Dev Day
Pitfall: DB as Sync Point
...
DB ( )
2018 iFunFactory Dev Day
Pitfall: DB as Sync Point
2018 iFunFactory Dev Day
Pitfall: DB as Sync Point
Solution #1. DB Cache
Solution #2.
2018 iFunFactory Dev Day
Optimistic CC ( )
• RPC
• PCC
•OCC
2018 iFunFactory Dev Day
RECAP
✓ 2
• Minimize Inefficiency
• Maximize Concurrency
2018 iFunFactory Dev Day
RECAP
✓ 2
• Minimize Inefficiency
• Maximize Concurrency
✓ , Concurrency
2018 iFunFactory Dev Day
RECAP
✓ 2
• Minimize Inefficiency
• Maximize Concurrency
✓ , Concurrency
✓ Concurrency 2
•
•
Q&A
2018 iFunFactory Dev Day
2018 iFunFactory Dev Day
Thank You!
660, 1 B 606
+82-70-4923-6566 www.ifunfactory.cominfo@ifu...
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[아이펀팩토리] 2018 데브데이 서버위더스 _03 Scalable 한 게임 서버 만들기

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2018 아이펀팩토리 데브데이 서버위더스
(iFunFactory DevDay Server,Withus)

제목 : Scalable 한 게임 서버 만들기
발표자 : 문대경 CEO
일정 : 2018년 03월 28일
개요 : 게임 서버의 고확장성을 확보하기 위한 기법들을 설명하고, 각 기법들의 서버 장애에 대한 대응 전략을 공개합니다.

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*아이펀팩토리 홈페이지 : https://ifunfactory.com/
*아이펀팩토리 기술 블로그 : https://blog.ifunfactory.com/

Veröffentlicht in: Technologie
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       Antworten 
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  • accessibility Books Library allowing access to top content, including thousands of title from favorite author, plus the ability to read or download a huge selection of books for your pc or smartphone within minutes.........ACCESS WEBSITE Over for All Ebooks ..... (Unlimited) ......................................................................................................................... Download FULL PDF EBOOK here { http://bit.ly/2m6jJ5M } .........................................................................................................................
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[아이펀팩토리] 2018 데브데이 서버위더스 _03 Scalable 한 게임 서버 만들기

  1. 1. Scalable (dkmoon@ifunfactory.com)
  2. 2. 2018 iFunFactory Dev Day Scalability? Scalability is the capability of a system, network, or process to handle a growing amount of work, or its potential to be enlarged to accommodate that growth. - Wikipedia
  3. 3. 2018 iFunFactory Dev Day Scalability? Scalability is the capability of a system, network, or process to handle a growing amount of work, or its potential to be enlarged to accommodate that growth. - Wikipedia Scalability is the capability of a system, network, or process to handle a growing amount of work, or its potential to be enlarged to accommodate that growth. Scalability , , ,
  4. 4. 2018 iFunFactory Dev Day Scalability Question in Gaming Q) ?
  5. 5. 2018 iFunFactory Dev Day ...
  6. 6. 2018 iFunFactory Dev Day Scalability Question in Gaming Q) ? Q) ?
  7. 7. 2018 iFunFactory Dev Day Scalability Question in Gaming Q) ? Q) ? A1)
  8. 8. 2018 iFunFactory Dev Day Scalability Question in Gaming Q) ? Q) ? A1) A2)
  9. 9. 2018 iFunFactory Dev Day Contents. 01 02 03 04 / 05 DB
  10. 10. 2018 iFunFactory Dev Day Offhand Approach “Scale-up” SW HW
  11. 11. 2018 iFunFactory Dev Day Scale-up
 for High Per-server Capacity Pros: (SW)
  12. 12. 2018 iFunFactory Dev Day Scale-up
 for High Per-server Capacity Pros: (SW) (via container/VM)
  13. 13. 2018 iFunFactory Dev Day Intel Xeon E5-46XX v4 Family Retail Prices
 (Launched in Q2’16) USD 0 USD 2000 USD 4000 USD 6000 USD 8000 E5-4610 v4 E5-4620 v4 E5-4627 v4 E5-4640 v4 E5-4650 v4 E5-4660 v4 E5-4667 v4 E5-4669 v4
  14. 14. 2018 iFunFactory Dev Day Scale-up
 for High Per-server Capacity Cons:
  15. 15. 2018 iFunFactory Dev Day Scale-up
 for High Per-server Capacity Cons: HW
  16. 16. 2018 iFunFactory Dev Day Scale-up
 for High Per-server Capacity Cons: HW
  17. 17. 2018 iFunFactory Dev Day Harmonious Approach “ SW ”
  18. 18. 2018 iFunFactory Dev Day Golden Rule Minimize Inefficiency Maximize Concurrency
  19. 19. 2018 iFunFactory Dev Day Inefficiency = Wasting CPU time
  20. 20. 2018 iFunFactory Dev Day Inefficiency = Wasting CPU time
  21. 21. 2018 iFunFactory Dev Day Inefficiency = Wasting CPU time
  22. 22. 2018 iFunFactory Dev Day Inefficiency = Wasting CPU time ) Indexing vs. Looping Guide #1. big O coefficient Guide #2. Busy-Waiting Asynchronous ( )
  23. 23. 2018 iFunFactory Dev Day Code Efficiency vs. Readability Q) 10% 50% ?
  24. 24. 2018 iFunFactory Dev Day Readability = Reliability = = = @_@/ ( , !)
  25. 25. 2018 iFunFactory Dev Day Efficiency vs. Readability trade-off ➡ efficiency
  26. 26. 2018 iFunFactory Dev Day Concurrency ( ..)
  27. 27. 2018 iFunFactory Dev Day Concurrency Units Threads (preemptive or cooperative) Processes (local or remote)
  28. 28. 2018 iFunFactory Dev Day More Units != More Concurrency By Benjamin D. Esham / Wikimedia Commons, CC BY-SA 3.0
 https://commons.wikimedia.org/w/index.php?curid=56559
  29. 29. 2018 iFunFactory Dev Day Concurrency ( ..)
  30. 30. 2018 iFunFactory Dev Day For Better Concurrency , Blocking
  31. 31. 2018 iFunFactory Dev Day For Better Concurrency Guide #1. Guide #2.
  32. 32. 2018 iFunFactory Dev Day Concurrency Control Concurrent sequential
  33. 33. 2018 iFunFactory Dev Day Concurrency Control Concurrent sequential ➡ Shared data
  34. 34. 2018 iFunFactory Dev Day Pessimistic Concurrency Control
  35. 35. 2018 iFunFactory Dev Day Pessimistic Concurrency Control • • Shared data • ) lock
 RDBMS xaction
  36. 36. 2018 iFunFactory Dev Day Optimistic Concurrency Control • • Shared data ,
 
 Roll-back & retry
  37. 37. 2018 iFunFactory Dev Day Q) ? DBMS ? Optimistic Concurrency Control
  38. 38. 2018 iFunFactory Dev Day Q) ? DBMS ? A) ? Optimistic Concurrency Control
  39. 39. 2018 iFunFactory Dev Day synchronization primitive primitive Optimistic CC ( )
  40. 40. 2018 iFunFactory Dev Day Pessimistic CC ( - ) Shared ObjectThread A Thread B Write Lock Read Write Unlock Process Locked
  41. 41. 2018 iFunFactory Dev Day Pessimistic CC ( - ) Shared ObjectThread A Thread B Write Lock Read Write Unlock Process Locked Read Lock Req Read Lock Return blocked
  42. 42. 2018 iFunFactory Dev Day Optimistic CC ( - ) Shared ObjectThread A Thread B Read Lock Read (Rev=1) Commit (Rev=1) Unlock Process Locked Write Lock Unlock Locked
  43. 43. 2018 iFunFactory Dev Day Optimistic CC ( - ) Shared ObjectThread A Thread B Read Lock Read (Rev=1) Commit (Rev=1) Unlock Process Locked Write Lock Unlock Read Lock Read (Rev=1) Unlock
  44. 44. 2018 iFunFactory Dev Day Pessimistic CC ( - ) Shared ObjectThread A Thread B Write Lock Read Write Unlock Process Locked Write Lock Req Write Lock Return blocked
  45. 45. 2018 iFunFactory Dev Day Optimistic CC ( - ) Read Lock Read (Rev=1) Commit (Rev=1) Unlock Process Locked Write Lock Unlock Read Lock Read (Rev=1) Unlock
  46. 46. 2018 iFunFactory Dev Day Optimistic CC ( - ) Read Lock Read (Rev=1) Commit (Rev=1) Unlock Process Locked Write Lock Unlock Read Lock Read (Rev=1) Unlock Write Lock Commit (Rev=1, REJECT) Locked Process
  47. 47. 2018 iFunFactory Dev Day Optimistic CC ( - ) Read Lock Read (Rev=1) Commit (Rev=1) Unlock Process Locked Write Lock Unlock Read Lock Read (Rev=1) Unlock Write Lock Commit (Rev=1, REJECT) Locked Read (Rev=2) Unlock Roll back & Retry Process Process
  48. 48. 2018 iFunFactory Dev Day Pessimistic CC vs. Optimistic CC
  49. 49. 2018 iFunFactory Dev Day Pessimistic CC vs. Optimistic CC Pessimistic Optimistic Low contention High contention progress rollback&retry (progress )
  50. 50. 2018 iFunFactory Dev Day •High contention •Low contention Pessimistic CC vs. Optimistic CC ➡ Pessimistic ➡ Optimistic
  51. 51. 2018 iFunFactory Dev Day Optimistic CC ( ) • • in-game 
 ( : )
  52. 52. 2018 iFunFactory Dev Day Optimistic CC ( ) • • in-game 
 ( : ) •
  53. 53. 2018 iFunFactory Dev Day Key Questions… • workload ?
  54. 54. 2018 iFunFactory Dev Day Key Questions… • workload ? • ?
  55. 55. 2018 iFunFactory Dev Day Key Questions… • workload ? • ? • ?
  56. 56. 2018 iFunFactory Dev Day Key Questions… • workload ? • ? • ? • ?
  57. 57. 2018 iFunFactory Dev Day Workload Distribution Domain- agnostic Domain- specific
  58. 58. 2018 iFunFactory Dev Day Domain-agnostic Distribution instance stateless processing unit ) web server scaling 
 PUBG
  59. 59. 2018 iFunFactory Dev Day Domain-specific Distribution in-memory state ) RPG 
 ,
  60. 60. 2018 iFunFactory Dev Day Workload Distribution Domain-Agnostic Domain-Specific state Scale-out reconfiguration State DB/Cache (centralized) RPC (distributed) in-memory master-slave replication
  61. 61. 2018 iFunFactory Dev Day Workload Distribution Guideline
  62. 62. 2018 iFunFactory Dev Day Workload Distribution Guideline
  63. 63. 2018 iFunFactory Dev Day Workload Distribution Guideline ✓ Concurrency 
 • Unit: thread → (remote) process
  64. 64. 2018 iFunFactory Dev Day Workload Distribution Guideline ✓ Concurrency 
 • Unit: thread → (remote) process ➡ , blocking
  65. 65. 2018 iFunFactory Dev Day Dos & Don’ts ✓ ✓ : Lobby vs. Room → specific
 Room instances → agnostic
  66. 66. 2018 iFunFactory Dev Day Dos & Don’ts ✓ ✓ : Lobby vs. Room → specific
 Room instances → agnostic ✓ Stateless stateful ✓ Stateful stateless ✓ : RPG workhorse
  67. 67. 2018 iFunFactory Dev Day Static Peer Configuration Pros • •
  68. 68. 2018 iFunFactory Dev Day Static Peer Configuration Cons • Dev Live • Live
  69. 69. 2018 iFunFactory Dev Day Dynamic Peer Discovery • registry 
 : Zookeeper, Redis, DB, … • • RPC endpoint • Server tags
  70. 70. 2018 iFunFactory Dev Day Dynamic Peer Discovery RPC=<IP, port> TAGS=[“lobby”]
  71. 71. 2018 iFunFactory Dev Day Dynamic Peer Discovery RPC=<IP, port> TAGS=[“lobby”] RPC=<IP, port> TAGS=[“game”, “chobo"]
  72. 72. 2018 iFunFactory Dev Day Dynamic Peer Discovery RPC=<IP, port> TAGS=[“lobby”] RPC=<IP, port> TAGS=[“game”, “chobo"]
  73. 73. 2018 iFunFactory Dev Day Dynamic Peer Discovery RPC=<IP, port> TAGS=[“lobby”] RPC=<IP, port> TAGS=[“game”, “chobo"]
  74. 74. 2018 iFunFactory Dev Day Pitfall: DB as Sync Point DB • • atomicity
  75. 75. 2018 iFunFactory Dev Day Pitfall: DB as Sync Point ... DB ( )
  76. 76. 2018 iFunFactory Dev Day Pitfall: DB as Sync Point
  77. 77. 2018 iFunFactory Dev Day Pitfall: DB as Sync Point Solution #1. DB Cache Solution #2.
  78. 78. 2018 iFunFactory Dev Day Optimistic CC ( ) • RPC • PCC •OCC
  79. 79. 2018 iFunFactory Dev Day RECAP ✓ 2 • Minimize Inefficiency • Maximize Concurrency
  80. 80. 2018 iFunFactory Dev Day RECAP ✓ 2 • Minimize Inefficiency • Maximize Concurrency ✓ , Concurrency
  81. 81. 2018 iFunFactory Dev Day RECAP ✓ 2 • Minimize Inefficiency • Maximize Concurrency ✓ , Concurrency ✓ Concurrency 2 • •
  82. 82. Q&A 2018 iFunFactory Dev Day 2018 iFunFactory Dev Day Thank You! 660, 1 B 606 +82-70-4923-6566 www.ifunfactory.cominfo@ifunfactory.com

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