Grokking the System Design Interview, Volume II
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Master Operations

The last lesson covered the metadata the master keeps. This lesson covers what the master does with it, the operations it performs to keep the cluster running.

The master, the single coordinator of a GFS cluster, runs every namespace operation. It also manages chunk replicas, the copies GFS keeps of every chunk, across the system. Its job includes:

  • Making replica placement decisions
  • Creating new chunks, and their replicas
  • Making sure chunks stay fully replicated, according to the replication factor
  • Balancing load across all the ChunkServers
  • Reclaiming unused storage

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