Daniel Cranford created CASSANDRA-17786:
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Summary: Seed docs are out of date
Key: CASSANDRA-17786
URL: https://issues.apache.org/jira/browse/CASSANDRA-17786
Project: Cassandra
Issue Type: Bug
Reporter: Daniel Cranford
The
[FAQ|https://cassandra.apache.org/doc/latest/cassandra/faq/index.html#are-seeds-SPOF]
states
{quote}
The ring can operate or boot without a seed
{quote}
This has not been true since Cassandra 3.6 when CASSANDRA-10134 required nodes
to complete a "shadow" gossip round or specify the undocumented
```cassandra.allow_unsafe_join``` property. AFAICT this "shadow" round is not
documented anywhere outside the code implementing it.
CASSANDRA-13851 improved things by allowing other nodes that are not themselves
booting to release a node from the shadow round and successfully boot. However,
this still means a node that is booting must contact a seed or a peer that is
not itself booting in order to start, making seed more crucial to booting than
the docs imply.
In particular, a full cluster bounce is not supported when there are no
reachable seeds since the non-seed peers required to release a node from the
shadow round will themselves be trapped in the shadow round.
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