Francisco Guerrero created CASSSIDECAR-174:
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Summary: Mechanism to have a reduced number of Sidecar instances
run operations
Key: CASSSIDECAR-174
URL: https://issues.apache.org/jira/browse/CASSSIDECAR-174
Project: Sidecar for Apache Cassandra
Issue Type: Improvement
Reporter: Francisco Guerrero
Assignee: Francisco Guerrero
This is a proposal to introduce a mechanism to have a reduced number of Sidecar
instances run operations across the cluster. Ideally we would want a unique
Sidecar instance perform a subset of operations in the cluster. However, the
operations might be triggered by more than one Sidecar instance so they can be
assumed to be safe to be performed by one or more leaders.
Currently Sidecar has existing use cases where we want a single Sidecar
instance to perform, for example schema initialization. There are upcoming use
cases in Sidecar that might be able to take advantage of this feature.
h3. Goals
- Have the ability to choose a reduced number of instances that can perform
operations where we would want only a minimal number of instances perform the
operations
- Easily write new tasks or define schemas that are going to be executed by
the reduced number of Sidecar instances
- Have some loose guarantees on always having at least one leader
h3. Non-Goals
- Have a unique global leader
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