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Systems (Sync (Drop box (Notes (Pull is bad (Notification server), Split…
Systems
Sync
Drop box
Challenges
Read Write 1:1
ACID
Notes
Pull is bad
Notification server
Split metadata and real data
Incremental changes
Google Doc
Ways
Locking
MemCache
Redis
Memcached
Recommendation
Amazon
Netflix
Sharing
Picture Sharing
Instagram
Users + pictures
Video
YouTube
Chat
news feed
Timeline
Graph Search
CDN
Twitter