2 Servers with 2 primary shards... optimization questions

Elastic Stack Elasticsearch
1

With this set up:

Server1 Server2

Primary Shard 1 Primary Shard 2
Replica Shard 1 Replica Shard 2

  1. If primary shard 1 failed, would replica shard 1 take over and become
    primary shard 1?
  2. Is reading performance optimized from 2 primary shards on 2 separate
    severs?
  3. With documentation stating "we would end up with two nodes having one
    shard each, and one node doing double the work with two
    shards."...specifically the "one node doing double the work with two
    shards"....do they mean 1 server having a primary shard and a replica
    shard?

Also,

Server1 Server2

Primary Shard 1 Primary Shard 2
Replica Shard 2 Replica Shard 1

  1. is this set up possible and would it be beneficial? If so, would I have
    to manually assign the shards or is this how ES does it default wise with 2
    servers and 2 shards?
  2. with this set up...if it is even possible...is there a read performance
    from having Primary Shard 1 on server 1 and having Replica Shard 1 on
    server 2?

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2

Your second example is what elasticsearch will do by default. It will never
allocate a primary and replica for the same shard on the same node. In that
example if one of the nodes were to go down both primaries would move to
the remaining node and the replicas would be unallocated and the cluster
will have yellow status.

Kimbro

On Thu, Jan 22, 2015 at 9:30 AM, Darin Hensley darin.hensley@gmail.com
wrote:

With this set up:

Server1 Server2

Primary Shard 1 Primary Shard 2
Replica Shard 1 Replica Shard 2

  1. If primary shard 1 failed, would replica shard 1 take over and become
    primary shard 1?
  2. Is reading performance optimized from 2 primary shards on 2 separate
    severs?
  3. With documentation stating "we would end up with two nodes having one
    shard each, and one node doing double the work with two
    shards."...specifically the "one node doing double the work with two
    shards"....do they mean 1 server having a primary shard and a replica
    shard?

Also,

Server1 Server2

Primary Shard 1 Primary Shard 2
Replica Shard 2 Replica Shard 1

  1. is this set up possible and would it be beneficial? If so, would I have
    to manually assign the shards or is this how ES does it default wise with 2
    servers and 2 shards?
  2. with this set up...if it is even possible...is there a read performance
    from having Primary Shard 1 on server 1 and having Replica Shard 1 on
    server 2?

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