Question about broadcasts

[F21]

I have read #10 and have the following questions:

1. If I use QueueBroadcast() on a memberlist.TransmitLimitedQueue, will it send the messages to every single node on the network? If so, why does serf's implementation rebroadcast the message after calling handleUserEvent(): https://github.com/hashicorp/serf/blob/555e0dcbb180ecbd03431adc28226bb3192558bc/serf/delegate.go#L62 ?

2. Under what circumstances will a message be broadcast? I am trying to broadcast a protobuf message that's 18 bytes, however, a lot of times, the message does not seem to be broadcast after it is queued.

[slackpad]

Hi @F21 for the first question, that queue still relies on gossip to broadcast the message, so a given node won't send it to every node in the cluster - it'll be broadcast via gossip to a few other nodes up to the calculated retransmitLimit (from the originating node). The call in handleUserEvent() helps keep the even propagating via gossip when it is received on another node. If the event is new to a given node, it'll broadcast it in a similar fashion. This keeps it moving through gossip as long as nodes are still hearing about it for the first time. Hope that helps answer the second question as well!