Example: Zookeeper

• Administration:

  • A cluster name shared by all nodes: user defined in agent configuration.
  • A cluster-unique name for the node: serverId value of the conf command output.
  • Version information: from the output of either envi or srvr command.

• Clustering: zookeeper processes forming an ensable.

• Sharding: (A shard is the entire ensemble)

  • A shard ID: the cluster name.
  • [Optional] An indicator of when the last write operation happened (commit offset):
    • The replication lag unit (i.e, seconds, commits, …): offset/zkid.
    • A commit offset value (as a 64-bits integer): the Zkid value of the srvr command.

• Replication:

  • Which shards are on the node: a single shard named as the cluster.
  • For each shard, what the role on the node is: Mode value of the srvr command output.
  • [Optional] For each non-primary shard, the replication lag: unavailable (need access to primary as well as local node).