Sam Tunnicliffe created CASSANDRA-21149:
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Summary: Make shadow gossip round parameters configurable for
testing
Key: CASSANDRA-21149
URL: https://issues.apache.org/jira/browse/CASSANDRA-21149
Project: Apache Cassandra
Issue Type: Improvement
Components: Cluster/Gossip, Test/dtest/python
Reporter: Sam Tunnicliffe
Assignee: Sam Tunnicliffe
When upgrading from 5.0 or earlier, nodes must construct an initial
ClusterMetadata as part of the process to elect the CMS. To do this, a cut down
version of the Gossip shadow round is used to discover and collate information
about peers. When the whole cluster is stopped and upgraded at the same time,
these gossip rounds can take longer to complete as the instances come back up.
Rolling upgrades are not affected, but several of the python upgrade tests
perform non-rolling upgrades and we often see these fail in CI as the restarts
take longer than the default CCM timeout. This issue is to make the parameters
of that gossip survey configurable, primarily to speed up those upgrade tests.
If the gossip survey can't be completed, nodes fall back to reconstructing
ClusterMetadata from state saved in system tables, which is always safe as any
inconsistency between peers will be caught during the election, and it's
certainly fine in the affected upgrade tests.
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