[jira] [Commented] (OAK-7316) Greedy ClusterNodeInfo

["Marcel Reutegger (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/OAK-7316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16389617#comment-16389617 ] 

Marcel Reutegger commented on OAK-7316:
---------------------------------------

Proposed changes are:

* If there is no existing unused clusterId that matches the current working directory and MAC address, then:
** Use the lowest unused {{clusterId}} and update the {{instance}} (working directory), {{machine}} (MAC address) and {{info}} fields of the corresponding document in the {{clusterNodes}} collection to match the starting DocumentNodeStore
** Create a new {{clusterId}} when all existing ones are currently active

> 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
>            Priority: Major
>             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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