CommandNotExpectedException, expected: Connected, acutal: SubscriptionDropped

[ghostbuster91]

Hi,

I am trying to migrate from evenstore 5 to 20, unfortunately code which used to work previously doesn't work any longer.

Logs:

receiver_1_f96977cd33ab | [INFO] [08/12/2020 08:40:24.871] [default-akka.actor.default-dispatcher-7] [akka://default/user/$a/cluster] Discovering cluster: attempt 1/10 successful: best candidate is MemberInfo(8c59e3f2-27ad-4e25-a3b5-c9b3bedbf1da,2020-08-12T08:40:24.082817200Z,Leader,true,/172.42.238.4:1112,/172.42.238.4:1113,/172.42.238.4:0,/172.42.238.4:0,/172.42.238.4:2112,/172.42.238.4:2112,1802,1908,1908,0,0,d8ed3958-271c-495c-bdd8-5d36b26d26cd,0)
receiver_1_f96977cd33ab | [INFO] [08/12/2020 08:40:24.884] [default-akka.actor.default-dispatcher-4] [akka://default/user/$a] Connected to /172.42.238.4:1113
receiver_1_f96977cd33ab | [ERROR] [08/12/2020 08:40:25.007] [default-akka.actor.default-dispatcher-23] [akka://default/user/$b] eventstore.core.CommandNotExpectedException: Expected: Connected, actual: eventstore.core.SubscriptionDropped$NotFound$

My setup:
evenstoreJVM client 7.2.0
evenstore custom version build from master from commit: 88363a1a00e022f87133e7da9c07a81c80453022 which is basically 20.6.0 with some fixes around cluster security

version: '3.4'

services:
  eventstore.db:
    image: eventstore-master
    environment:
      - EVENTSTORE_CLUSTER_SIZE=3
      - EVENTSTORE_HTTP_PORT=2112
      - EVENTSTORE_INT_IP=172.42.238.3
      - EVENTSTORE_EXT_IP=172.42.238.3
      - EVENTSTORE_INSECURE=true
      - EVENTSTORE_ENABLE_EXTERNAL_TCP=true
      - EVENTSTORE_GOSSIP_SEED=172.42.238.4:2112,172.42.238.5:2112
      - EVENTSTORE_DISCOVER_VIA_DNS=false
    ports:
      - "1112:1112"
      - "1113:1113"
      - "2112:2112"
      - "2113:2113"
      - "30777"
    networks:
      app_net:
        aliases:
          - eventstore.local
        ipv4_address: 172.42.238.3

  eventstore.db2:
    image: eventstore-master
    environment:
      - EVENTSTORE_CLUSTER_SIZE=3
      - EVENTSTORE_HTTP_PORT=2112
      - EVENTSTORE_INT_IP=172.42.238.4
      - EVENTSTORE_EXT_IP=172.42.238.4
      - EVENTSTORE_INSECURE=true
      - EVENTSTORE_ENABLE_EXTERNAL_TCP=true
      - EVENTSTORE_GOSSIP_SEED=172.42.238.3:2112,172.42.238.5:2112
      - EVENTSTORE_DISCOVER_VIA_DNS=false
    expose:
      - "1112"
      - "1113"
      - "2112"
      - "2113"
      - "30777"
    networks:
      app_net:
        aliases:
          - eventstore.local
        ipv4_address: 172.42.238.4

  eventstore.db3:
    image: eventstore-master
    environment:
      - EVENTSTORE_CLUSTER_SIZE=3
      - EVENTSTORE_HTTP_PORT=2112
      - EVENTSTORE_INT_IP=172.42.238.5
      - EVENTSTORE_EXT_IP=172.42.238.5
      - EVENTSTORE_INSECURE=true
      - EVENTSTORE_ENABLE_EXTERNAL_TCP=true
      - EVENTSTORE_GOSSIP_SEED=172.42.238.3:2112,172.42.238.4:2112
      - EVENTSTORE_DISCOVER_VIA_DNS=false
    expose:
      - "1112"
      - "1113"
      - "2112"
      - "2113"
      - "30777"
    networks:
      app_net:
        aliases:
          - eventstore.local
        ipv4_address: 172.42.238.5
  sender:
    image: softwaremill/mq-sender
    networks:
      app_net:
        ipv4_address: 172.42.238.10

[ahjohannessen]

As far as I can tell, nothing has changed in the jvm client with respect to PersistentSubscriptionOperation or SubscriptionOperation - Tests for es20.6.x pass on CI, so that is a bit odd.

[adamw]

Turns out the error is misleading, on the server the logs say that:

Nov 25 11:19:23 ip-172-22-1-39 bash[8313]: System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values. (Parameter 'ReadBatchSize may not be greater than or equal to BufferSize')

So this is a client configuration issue. The message might probably be better, though :)