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https://issues.apache.org/jira/browse/CASSANDRA-16856?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Semb Wever updated CASSANDRA-16856:
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Fix Version/s: (was: 3.11.x)
> Prevent broken concurrent schema pulls
> --------------------------------------
>
> Key: CASSANDRA-16856
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16856
> Project: Cassandra
> Issue Type: Bug
> Components: Cluster/Gossip
> Reporter: Berenguer Blasi
> Assignee: Berenguer Blasi
> Priority: Normal
> Fix For: 3.11.12, 4.1, 4.0.x
>
>
> There's a race condition around pulling schema changes, that can occur in
> case the schema changes push/propagation mechanism is not immediately
> effective (e.g. because of network delay, or because of the pulling node
> being down, etc.).
> If schema changes happen on node 1, these changes do not reach node 2
> immediately through the SCHEMA.PUSH mechanism, and are first recognized
> during gossiping, the corresponding SCHEMA.PULL request from node 2 can catch
> the node 1 schema in the middle of it being modified by another schema change
> request. This can easily lead to problems (e.g. if a new table is being
> added, and the node 2 request reads the changes that need to be applied to
> system_schema.tables, but not the ones that need to be applied to
> system_schema.columns).
> This PR addresses that by synchronizing the SCHEMA.PULL "RPC call" executed
> in node 1 by a request from node 2 with the method for applying schema
> changes in node 1.
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