How does Allocation of shards happens, when a node leaves cluster?

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1

I want to know the exact procedure followed, for the allocation of shards on a node when the node leaves the cluster. Facts I know -
1.) ES waits for sometime before the reassigning the shards.
2.) For primary shards, a valid replica is searched for and then the replica is promoted to primary.

Questions I have
1.) Which allocator specifically handles this scenario?(BalancedShardAllocator/GatewayAllocator or some other?)
2.) What happens to replica shards, are they dropped or allocated to some other node..

Thanks.

2
  1. GatewayAllocator
  2. Assigned replicas are left where they are. Unassigned replicas are assigned normally.
3

Thanks for your kind reply,
Can you provide me with link of some blog or post where I can read in depth about the allocation of shards in depth.

4

I don't think there is a blog post that goes into this level of detail. You'll need to read the source code.

5

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