Clarification on FailoverRoute and gutter setup

[kroemeke]

Hi there,

I'm trying to configure mcrouter in the following way:

Pool of N servers using consistent hashing, but if a shard dies - another shard is used, and if that shard dies - another one is used and so on...

Is it possible to have all requests to go to Pool with ch3 hash, and on shard failure - start using FailoverRoute with another or even the same pool of servers ?

Thanks in advance,
Marek

[kroemeke]

I found a working solution - which is having a FailoverRoute that has 2 children - 1st - HashRoute wrapped pool, followed by a FailoverRoute wrapped pool (same pool in my case). In case it helps anyone :

{
  "pools":
    {
      "primary_ipv4": {
         "hash": "ch3",
         "protocol": "ascii",
         "keep_routing_prefix": true,
         "servers": [
            "10.9.8.11:1234",
            "10.9.8.17:1234",
            "10.9.8.23:1234",
            "10.9.8.29:1234",
            "10.9.8.47:1234",
            "10.9.8.5:1234",
            "10.9.8.53:1234",
            "10.9.8.59:1234",
            "10.9.8.65:1234",
         ],
      },
    },
  "route": {
    "type": "FailoverRoute",
    "children": [
      "HashRoute|Pool|primary_ipv4",
      "FailoverRoute|Pool|primary_ipv4"
    ],
    "failover_errors": ["tko"],
  }
}