First message sent in a federated server room is not visible to a newly joined user

[Zhani-M]

Description

First message sent in a federated server room is not visible to a newly joined user from another server until a second message is sent.

Steps to reproduce

• Set up two federated servers, Server A and Server B.
• Create two users, User C on Server A and User P on Server B.
• Create a room on Server A.
• Have User C join the room and send a message.
• Have User P join the same room from Server B.
• Observe that User P cannot see the previous message sent by User C.
• Have User C send another message.
• Observe that User P can now see all the previous messages in the room.

Homeserver

Private server

Synapse Version

Synapse/1.105.1

Installation Method

Docker (matrixdotorg/synapse)

Database

Postgress DB - no restores

Workers

Multiple workers

Platform

Kubernetes 1.30

Configuration

No response

Relevant log output

~~~~SERVER C ROOM EVENT LOG~~~~~~
{
  "chunk": [
    {
      "content": {
        "m.federate": true,
        "room_version": "11",
        "type": "m.room"
      },
      "origin_server_ts": 1723552781136,
      "room_id": "[Private]",
      "sender": "[Private]",
      "state_key": "",
      "type": "m.room.create",
      "unsigned": {
        "age": 25890
      },
      "event_id": "$3-x8Hm6whC1iwEatgUW1R1fPfg8I3vD3ueZ828BHvR4",
      "user_id": "[Private]",
      "age": 25890
    },
    {
      "content": {
        "displayname": "admin-service-user",
        "membership": "join"
      },
      "origin_server_ts": 1723552781417,
      "room_id": "[Private]",
      "sender": "[Private]",
      "state_key": "[Private]",
      "type": "m.room.member",
      "unsigned": {
        "age": 25609
      },
      "event_id": "$cWC-nCXhCd9JbN6haIJupt4NXT-5Nd2GBS2YPzBW4SU",
      "user_id": "[Private]",
      "age": 25609
    },
    {
      "content": {
        "ban": 100,
        "events": {
          "m.room.avatar": 100,
          "m.room.invite": 100,
          "m.room.message": 50,
          "m.room.name": 100,
          "m.room.power_levels": 100,
          "m.room.redaction": 100
        },
        "events_default": 50,
        "invite": 100,
        "kick": 100,
        "redact": 100,
        "state_default": 50,
        "users": {
          "[Private]": 75,
          "[Private]": 100,
          "[Private]": 50
        },
        "users_default": 0
      },
      "origin_server_ts": 1723552781650,
      "room_id": "[Private]",
      "sender": "[Private]",
      "state_key": "",
      "type": "m.room.power_levels",
      "unsigned": {
        "age": 25376
      },
      "event_id": "$M2voXDPVYkALt9LtRjD3NQq9Xob5Hgqxmoge9IQUySk",
      "user_id": "[Private]",
      "age": 25376
    },
    {
      "content": {
        "alias": "[Private]"
      },
      "origin_server_ts": 1723552781679,
      "room_id": "[Private]",
      "sender": "[Private]",
      "state_key": "",
      "type": "m.room.canonical_alias",
      "unsigned": {
        "age": 25347
      },
      "event_id": "$j5sVGzISuwJtYqrlOEozT-vtisXgI09WIRneHxIqqfY",
      "user_id": "[Private]",
      "age": 25347
    },
    {
      "content": {
        "guest_access": "can_join"
      },
      "origin_server_ts": 1723552781680,
      "room_id": "!SzZenEWOOJxCvgNvkQ:matrix.api.[Private].com",
      "sender": "@admin-service-user:matrix.api.[Private].com",
      "state_key": "",
      "type": "m.room.guest_access",
      "unsigned": {
        "age": 25346
      },
      "event_id": "$jzftrw1geQbBBCEFakjfF3vCponj4eMNBcwEOMEue74",
      "user_id": "@admin-service-user:matrix.api.[Private].com",
      "age": 25346
    },
    {
      "content": {
        "join_rule": "invite"
      },
      "origin_server_ts": 1723552781680,
      "room_id": "!SzZenEWOOJxCvgNvkQ:matrix.api.[Private].com",
      "sender": "@admin-service-user:matrix.api.[Private].com",
      "state_key": "",
      "type": "m.room.join_rules",
      "unsigned": {
        "age": 25346
      },
      "event_id": "$nFv_Q2g-Sh6W1L7zj7y7oXWGYxEAV0wx9KAzRJlonWs",
      "user_id": "@admin-service-user:matrix.api.[Private].com",
      "age": 25346
    },
    {
      "content": {
        "history_visibility": "shared"
      },
      "origin_server_ts": 1723552781681,
      "room_id": "!SzZenEWOOJxCvgNvkQ:matrix.api.[Private].com",
      "sender": "@admin-service-user:matrix.api.[Private].com",
      "state_key": "",
      "type": "m.room.history_visibility",
      "unsigned": {
        "age": 25345
      },
      "event_id": "$Szdw-DSwuXPhG09tU7XR1uH-VYHipSsMgRfg1h1YsMo",
      "user_id": "@admin-service-user:matrix.api.[Private].com",
      "age": 25345
    },
    {
      "content": {
        "name": "RoomTest13"
      },
      "origin_server_ts": 1723552781682,
      "room_id": "!SzZenEWOOJxCvgNvkQ:matrix.api.remote-development.[private].com",
      "sender": "@admin-service-user:matrix.api.remote-development.[private].com",
      "state_key": "",
      "type": "m.room.name",
      "unsigned": {
        "age": 25344
      },
      "event_id": "$WoYgCxgrpWseqjwJOapp0A-JaknaB5ymFHrlohU4WjQ",
      "user_id": "@admin-service-user:matrix.api.remote-development.[private].com",
      "age": 25344
    },
    {
      "content": {
        "displayname": "Private",
        "membership": "invite"
      },
      "origin_server_ts": 1723552782654,
      "room_id": "!SzZenEWOOJxCvgNvkQ:matrix.api.remote-development.[private].com",
      "sender": "@admin-service-user:matrix.api.remote-development.[private].com",
      "state_key": "@0674ad5a-821f-4f4b-af2d-b61ea0fca8d0:matrix.api.remote-development.[private].com",
      "type": "m.room.member",
      "unsigned": {
        "age": 24372
      },
      "event_id": "$0e6TDZoqlHouteDJCOK27LqUXNnBOjBGJzTZHBovIxk",
      "user_id": "@admin-service-user:matrix.api.remote-development.[private].com",
      "age": 24372
    },
    {
      "content": {
        "displayname": "ee2fa896-1eeb-49ef-839d-236d55458ef1",
        "membership": "invite"
      },
      "origin_server_ts": 1723552783162,
      "room_id": "!SzZenEWOOJxCvgNvkQ:matrix.api.remote-development.[private].com",
      "sender": "@admin-service-user:matrix.api.remote-development.[private].com",
      "state_key": "@ee2fa896-1eeb-49ef-839d-236d55458ef1:matrix.api.remote-development.[private].com",
      "type": "m.room.member",
      "unsigned": {
        "age": 23864
      },
      "event_id": "$9SWbafArb8l3hSg05CUXWbeEFwGonuvSQGrM1t6fsUM",
      "user_id": "@admin-service-user:matrix.api.remote-development.[private].com",
      "age": 23864
    },
    {
      "content": {
        "displayname": "[private]",
        "membership": "join"
      },
      "origin_server_ts": 1723552783850,
      "room_id": "!SzZenEWOOJxCvgNvkQ:matrix.api.remote-development.[private].com",
      "sender": "@0674ad5a-821f-4f4b-af2d-b61ea0fca8d0:matrix.api.remote-development.[private].com",
      "state_key": "@0674ad5a-821f-4f4b-af2d-b61ea0fca8d0:matrix.api.remote-development.[private].com",
      "type": "m.room.member",
      "unsigned": {
        "replaces_state": "$0e6TDZoqlHouteDJCOK27LqUXNnBOjBGJzTZHBovIxk",
        "prev_content": {
          "displayname": "[private]",
          "membership": "invite"
        },
        "prev_sender": "@admin-service-user:matrix.api.remote-development.[private].com",
        "age": 23176
      },
      "event_id": "$lPhhY3ILsMoZGlS0yHN1Sa3od9lwAf4To4GFn7dPYHQ",
      "user_id": "@0674ad5a-821f-4f4b-af2d-b61ea0fca8d0:matrix.api.remote-development.[private].com",
      "age": 23176,
      "replaces_state": "$0e6TDZoqlHouteDJCOK27LqUXNnBOjBGJzTZHBovIxk",
      "prev_content": {
        "displayname": "[private]",
        "membership": "invite"
      }
    },
    {
      "content": {
        "body": "RoomTest13",
        "msgtype": "m.text"
      },
      "origin_server_ts": 1723552784297,
      "room_id": "!SzZenEWOOJxCvgNvkQ:matrix.api.remote-development.[private].com",
      "sender": "@0674ad5a-821f-4f4b-af2d-b61ea0fca8d0:matrix.api.remote-development.[private].com",
      "type": "m.room.message",
      "unsigned": {
        "age": 22729
      },
      "event_id": "$HyHjyNdIfIS53iZ-k3x68vD2EDrQ0oJ9zNLWtnHk_c8",
      "user_id": "@0674ad5a-821f-4f4b-af2d-b61ea0fca8d0:matrix.api.remote-development.[private].com",
      "age": 22729
    },
    {
      "content": {
        "avatar_url": null,
        "displayname": "ee2fa896-1eeb-49ef-839d-236d55458ef1",
        "membership": "join"
      },
      "origin_server_ts": 1723552784706,
      "room_id": "!SzZenEWOOJxCvgNvkQ:matrix.api.remote-development.[private].com",
      "sender": "@ee2fa896-1eeb-49ef-839d-236d55458ef1:matrix.api.remote-development.[private].com",
      "state_key": "@ee2fa896-1eeb-49ef-839d-236d55458ef1:matrix.api.remote-development.[private].com",
      "type": "m.room.member",
      "unsigned": {
        "age": 13,
        "replaces_state": "$9SWbafArb8l3hSg05CUXWbeEFwGonuvSQGrM1t6fsUM",
        "prev_content": {
          "displayname": "ee2fa896-1eeb-49ef-839d-236d55458ef1",
          "membership": "invite"
        },
        "prev_sender": "@admin-service-user:matrix.api.remote-development.[private].com"
      },
      "event_id": "$Z_zDWFIrNHkOsrWYm8zv94aP6XTUrkVQHDIFoyxB6Dk",
      "user_id": "@ee2fa896-1eeb-49ef-839d-236d55458ef1:matrix.api.remote-development.[private].com",
      "age": 13,
      "replaces_state": "$9SWbafArb8l3hSg05CUXWbeEFwGonuvSQGrM1t6fsUM",
      "prev_content": {
        "displayname": "ee2fa896-1eeb-49ef-839d-236d55458ef1",
        "membership": "invite"
      }
    }
  ],
  "start": "s0_0_0_0_0_0_0_0_0_0",
  "end": "t13-3395_0_0_0_0_0_0_0_0_0"
}
~~~~SERVER P ROOM EVENT LOG~~~~~~
{
  "chunk": [
      {
          "content": {
              "avatar_url": null,
              "displayname": "ee2fa896-1eeb-49ef-839d-236d55458ef1",
              "membership": "join"
          },
          "origin_server_ts": 1723552784706,
          "room_id": "!SzZenEWOOJxCvgNvkQ:matrix.api.remote-development.[private].com",
          "sender": "@ee2fa896-1eeb-49ef-839d-236d55458ef1:matrix.api.remote-development.[private].com",
          "state_key": "@ee2fa896-1eeb-49ef-839d-236d55458ef1:matrix.api.remote-development.[private].com",
          "type": "m.room.member",
          "unsigned": {
              "age": 13,
              "replaces_state": "$9SWbafArb8l3hSg05CUXWbeEFwGonuvSQGrM1t6fsUM",
              "prev_content": {
                  "displayname": "ee2fa896-1eeb-49ef-839d-236d55458ef1",
                  "membership": "invite"
              },
              "prev_sender": "@admin-service-user:matrix.api.remote-development.[private].com"
          },
          "event_id": "$Z_zDWFIrNHkOsrWYm8zv94aP6XTUrkVQHDIFoyxB6Dk",
          "user_id": "@ee2fa896-1eeb-49ef-839d-236d55458ef1:matrix.api.remote-development.[private].com",
          "age": 13,
          "replaces_state": "$9SWbafArb8l3hSg05CUXWbeEFwGonuvSQGrM1t6fsUM",
          "prev_content": {
              "displayname": "ee2fa896-1eeb-49ef-839d-236d55458ef1",
              "membership": "invite"
          }
      }
  ],
  "start": "s0_0_0_0_0_0_0_0_0_0",
  "end": "t13-1225_0_0_0_0_0_0_0_0_0"
}

Anything else that would be useful to know?

No response

[maylukas]

We're seeing the same problem with Chat messages not being shown directly after joining the room. It takes sometimes like 30 min for them to be visible in the UI