Grokking the Advanced System Design Interview
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Criticism on GFS

Here is the summary of criticism on GFS's architecture.

Problems associated with single master

As GFS has grown in usage, Google has started to see the following problems with the centralized master scheme:

  • Despite the separation of control flow (i.e., metadata operations) and data flow, the master is emerging as a bottleneck in the design. As the number of clients grows, a single master could not serve them because it does not have enough CPU power.




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