Grokking the System Design Interview, Volume II
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Metadata

The last two lessons looked at chunks, ChunkServers, and the master that coordinates them. This lesson looks at exactly what metadata the master keeps, and how it manages it.

The master, the single server that coordinates a GFS cluster, stores three types of metadata:

  1. The file and chunk namespaces, the directory hierarchy.
  2. The mapping from files to chunks.
  3. The locations of each chunk's replicas, the copies of that chunk kept on other ChunkServers.

The master keeps all three kinds of metadata in memory

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G

Gary

· 4 years ago

" The new checkpoint includes all mutations before the switch."

Shouldn't that be after the switch?

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