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How are you storing user to connection object?
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2
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25
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July 27, 2022
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Sharding on UserId? How does the other user get their messages?
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6
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151
|
July 10, 2022
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Database design of Facebook Messenger
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15
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6865
|
March 26, 2022
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Data Sharding with Many-To-Many relationship
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1
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113
|
March 7, 2022
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How do we assume a modern web server can handle 50k concurrent connections?
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9
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2118
|
February 17, 2022
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Sequence number will determine the exact ordering of messages for each user
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2
|
167
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February 4, 2022
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How does the messenger maintain the sequencing of the messages?
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32
|
7781
|
February 4, 2022
|
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Missing Database Design!
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3
|
95
|
January 11, 2022
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Use in-memory db to forward messages?
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1
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70
|
November 26, 2021
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If we store different messages of a user on separate database shards, fetching a range of messages of a chat would be very slow
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3
|
116
|
November 4, 2021
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Cannot use NoSQL like MongoDB because we cannot afford to read/write a row from the database every time a user receives/sends a message
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1
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110
|
October 25, 2021
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Server does not need to keep track of the pending messages
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1
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94
|
October 22, 2021
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Whenever a user comes online, the server can always broadcast that status
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0
|
75
|
October 20, 2021
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Receiving a message for a user who has gone offline
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0
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68
|
October 18, 2021
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Bandwidth Estimation
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0
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74
|
October 18, 2021
|
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Timestamp vs. sequence number
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1
|
182
|
October 13, 2021
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Which server does the load balancer route the sender to
|
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1
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80
|
October 12, 2021
|
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Long polling, why not send to user B chat server directly?
|
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10
|
543
|
October 11, 2021
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Benefit of hbase over mongo
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1
|
104
|
October 8, 2021
|
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The hash table for {userID, ConnectionObj}
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2
|
117
|
October 1, 2021
|
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Transient Message Store is missing in the detailed design
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0
|
163
|
April 10, 2021
|
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Why use Hbase when we need consistency?
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0
|
178
|
February 20, 2021
|
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Not clear how client will know updates of status of friends?
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0
|
155
|
December 26, 2020
|
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The Data Partitioning scheme is making way too many shards
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|
0
|
174
|
December 23, 2020
|
|
Facebook messenger asked at interview
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|
12
|
7409
|
December 22, 2020
|
|
How server handle messages from different users chatting with same user?
|
|
2
|
347
|
September 21, 2020
|
|
How the DB schema will look like for storing messages for each users?
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|
0
|
213
|
September 20, 2020
|
|
Message handling question
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|
1
|
412
|
September 11, 2020
|
|
Why cannot server-sent-events be used in place of Long Polling or WebSockets?
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|
1
|
607
|
September 11, 2020
|
|
Basic DB design
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0
|
197
|
September 1, 2020
|