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How does Hazelcast autostart work?

I would like to know how Hazelcast Autodiscover works. How do nodes find other nodes in the network? And how do they know when a node is dead?

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There are 3 different types of detection:

  • multicast. Therefore, we scream over the network and try to find other participants.
  • tcp / ip: we need to have some well-known members. If one or more of these known members are online, other members may form a cluster.
  • aws: we just go to aws, read out all instances in a given region, apply some filtering, and what we remain are well-known members. From now on, we rely on tcp / ip based clustering.

So, this is a brief summary of how automatic detection works.

Detection of node failure is performed based on heart rate. Therefore, every x seconds we send a message to all members of the clusters, those that cannot respond are ultimately declared dead.

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