Grokking the Advanced System Design Interview
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Mock Interview: GFS
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Test your knowledge of GFS's architecture by answering these questions.

How does GFS scale?
How does GFS ensure fault-tolerance and reliability of data?
How does GFS manage high availability?
How does GFS perform master failover?
What benefits does GFS get from a single master?
What problems does GFS face by having a single master?
How does GFS ensure file data integrity?
How does GFS decouple control flow from data flow, and what benefits does it provide?
How does lazy space allocation help GFS?
Can GFS handle small files efficiently?
What are reference counts in context of snapshotting?
Let's assume C1 is the primary replica ChunkServer of a chunk, and there is a network partition between the master and C1. When the master notices this, it will designate some other ChunkServer as primary, say C2. Since C1 did not actually fail, are there now two primaries for the same chunk?
How does GFS handle data consistency?
As GFS preferred performance and simplicity over correctness, how did it work for GFS?

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