Sys Design - Handling Consistency Needs at High Scale

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blindywest

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blindywest
Jun 9, 2021 6 Comments

I'm working through Google Drive/Dropbox systems design and I'm struggling specifically with consistency with the metadata DB once we need to horizontally scale. We need consistency so ACID RDBMS makes sense (and document metadata is highly relational so it also makes sense there as well).

But doesn't the baked in benefit of consistency start to go away when we have to shard an RDBMS for scale/location/speed reasons? Looking for some insight into how this might scale out.

(Also, I realize we could use Cassandra with replication mode favoring consistency, but I'm really trying to get my head around the RDBMS solution to properly defend it) #sysdesign #software #engineering

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