Marcel Reutegger created OAK-7316:
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Summary: Greedy ClusterNodeInfo
Key: OAK-7316
URL: https://issues.apache.org/jira/browse/OAK-7316
Project: Jackrabbit Oak
Issue Type: Improvement
Components: documentmk
Reporter: Marcel Reutegger
Assignee: Marcel Reutegger
Fix For: 1.10
The {{ClusterNodeInfo}} is responsible for assigning a {{clusterId}} to a
DocumentNodeStore on startup. The current implementation uses the lowest MAC
address available on the system and the working directory as information to
reuse a previously assigned {{clusterId}}. This ensures a DocumentNodeStore
gets the same {{clusterId}} after a restart.
For static deployments this works fine, but become a problem when deployments
are more dynamic. Consider a cluster deployed on container infrastructure.
Scaling the application may mean cluster nodes are added or removed over time
and deployed on various types of machines depending on current load and
required resources. Over time more and more unused {{clusterIds}} would exist
and and bloat underlying documents in the DocumentStore.
This issue proposes a more greedy algorithm when a {{clusterId}} is assigned to
a DocumentNodeStore.
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