Grokking the System Design Interview, Volume II
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Single Master and Large Chunk Size

This lesson looks at two of GFS's central design choices: a single master, and a large chunk size.

Single master

A single master, the one server that coordinates the cluster and holds its metadata, simplifies GFS a great deal. It also gives that master global knowledge. That knowledge is enough to make good decisions about chunk placement, chunks being the fixed-size pieces a file is split into, and about replication.

Global knowledge has a cost. Every read and every write could end up waiting on that one server. GFS avoids this by keeping the master out of the data path

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G

Gary

· 4 years ago

The diagram seems to have an unfortunate misspelling in the text at the bottom:

"Data transfer happens directly between client and chinkservers"

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