Merge #16404: qa: Test ZMQ notification after chain reorg

abdfc5e89b qa: Test ZMQ notification after chain reorg (João Barbosa)
aa2622a726 qa: Refactor ZMQ test (João Barbosa)
6bc1ff915d doc: Add note regarding ZMQ block notification (João Barbosa)

Pull request description:

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Tree-SHA512: b93237adc8c84b3aa72ccc28097090eabcb006cf408083218bebf6fec703bd0de2ded80b6879e77096872e14ba9402a6d3f923b146a54d4c4e41dcb862c3e765
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MarcoFalke
2019-08-26 09:09:30 -04:00
2 changed files with 59 additions and 39 deletions

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@@ -111,7 +111,9 @@ using other means such as firewalling.
Note that when the block chain tip changes, a reorganisation may occur
and just the tip will be notified. It is up to the subscriber to
retrieve the chain from the last known block to the new tip.
retrieve the chain from the last known block to the new tip. Also note
that no notification occurs if the tip was in the active chain - this
is the case after calling invalidateblock RPC.
There are several possibilities that ZMQ notification can get lost
during transmission depending on the communication type you are