Cluster State

  • With ElasticSearch it is easy to create a lot of indices, nodes, and lots and lots of shards

  • Cluster State contains all of the mapping for every index and every field in the cluster

  • Loggly.com shared a story where they have a cluster with 900MB of cluster state

  • Cluster State is stored and replicated between every node in the cluster

  • Since ElasticSearch 2.0, cluster state changes have been sent as differences rather than complete state

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