Isaac Reath created CASSANDRA-21024:
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Summary: Add configuration to disk usage guardrails to stop writes
across all replicas of a keyspace when any node replicating that keyspace
exceeds the disk usage failure threshold.
Key: CASSANDRA-21024
URL: https://issues.apache.org/jira/browse/CASSANDRA-21024
Project: Apache Cassandra
Issue Type: Improvement
Components: Feature/Guardrails
Reporter: Isaac Reath
Assignee: Isaac Reath
[CASSANDRA-17150|https://issues.apache.org/jira/browse/CASSANDRA-17150]
introduced disk usage guardrails that stop writes for specific tokens when any
replica responsible for those tokens exceeds the configured failure threshold.
This mechanism protects individual nodes from running out of disk space but can
result in inconsistent write availability when only a subset of replicas or
token ranges are affected. This in turn pushes the responsibility onto the
application owner to decide how to handle the partial write unavailability.
We propose adding a new configuration option,
data_disk_usage_stop_writes_for_keyspace_on_fail, that extends this behavior to
the keyspace level. When enabled, if any node that participates in replication
for a keyspace exceeds the disk usage failure threshold, writes to that
keyspace will be stopped across all nodes who replicate that keyspace.
This change provides operators with finer control over guardrail enforcement,
allowing them to choose between the current per-token behavior or a stricter,
keyspace-wide policy that prioritizes simplicity and operational predictability
over partial write availability.
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