1. Zookeeper 소개
javawork93@gmail.com
임영기

2. 제공하는 기능
• znode 생성 / 삭제
• 데이터(znode)를 트리 구조로 저장
• 데이터가 변경되면 구독자들에게 통보
• Ephemeral node
• Sequence node

3. API
• zoo_init
• zoo_create
• zoo_delete
• zoo_exist
• zoo_get_children
• zoo_close
• sync / async version

4. Global Configuration

5. Cluster 구성
• 서버가 구동되면서 자신을 등록
• Ephemeral node
• 서버가 죽으면 자동으로 노드가 삭제됨

6. Cluster 구성 #1
Zookeeper
Server
zoo_create( ephemeral | sequence )

7. Cluster 구성 #2
Zookeeper
Server
server0001

8. Cluster 구성 #3
Zookeeper
server
server0001
server
Server
server0002
server0003

9. Cluster 구성 #4
Zookeeper
server
server0001
server
Server
server0002
server0003
zoo_get_children
Client

10. Cluster 구성 #5
Zookeeper
server
server0001
server
server
server0002
server0003
connect Client

11. Cluster 구성 #6
Zookeeper
server
server0001
server
server0003
server0002
server0003
Crash!
!
Client

12. Cluster 구성 #7
Zookeeper
server
server0001
server0002
server0002
Client

13. 분산 Lock #1
Zookeeper
server zoo_create( sequence )
server
Client

14. 분산 Lock #2
Client0001
(working)
Client0002
(wait)
Zookeeper
Client0001
Client0002
Client0003
Client0003
(wait)

15. 분산 Lock #3
Client0001
(working)
Client0002
(waiting)
Zookeeper
Client0001
Client0002
Client0003
Client0003
(waiting)
zoo_delete

16. 분산 Lock #4
Client0002
(waiting)
Zookeeper
Client0002
Client0003
Client0003
(waiting)
Notify

17. 분산 Lock #5
Client0002
(working)
Zookeeper
Client0002
Client0003
Client0003
(wait)

18. Job Distribution #1
Zookeeper
Producer
zoo_create(sequence)

19. Job Distribution #2
Zookeeper
Producer Consumer
Job0001
Consumer
Notify

20. Job Distribution #3
Zookeeper
Producer Consumer
Job0001
Consumer
zoo_delete

21. Job Distribution #4
Zookeeper
Producer ConsumerConsumer
Success
Fail
Job0001

22. Job Distribution #5
Zookeeper
Producer Consumer
Consumer
(working)
Job0001

23. 그 밖에
• Barriers
• Queues
• Two-phased Commit
• Leader Election

24. 단점
• Write가 많은 경우 성능 저하
• znode 용량 제한(1MB)
• C Client driver(Windows)

25. Reference
• http://zookeeper.apache.org/
• http://creatorw.tistory.com/category/분산처
리/주키퍼/
• http://helloworld.naver.com/helloworld/text
yle/294797