RDoc-3179 Update the Cluster Configuration #1979
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karmeli87
reviewed
Mar 4, 2025
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| * The primary goal of the `Cluster Observer` is to maintain the [Replication Factor](../../../server/clustering/distribution/distributed-database#replication-factor) of each database in the cluster. |
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The primary goal is to monitor the health of each database and adjust the topology accordingly.
| Let's assume it is distributed to B, C and E (so the database group is [B,C,E]), | ||
| and the cluster decides that node C is responsible for performing the ETL task. | ||
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| * If node C goes offline or is not reachable, the Observer will notice it and relocate the database from node C to another available node. |
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relocate the database
This is last resort and not something we do frequently... since it is a heavy operation. consider a large database with many indexes. to replicate it and to index everything on a new node might take some time and resources.
first we will rotate the topology or move this node to rehab and due to the topology change a different node will be selected to do the task.
if that node is offline for a long period of time we start the relocation (need to check which config define this time)
karmeli87
approved these changes
Mar 5, 2025
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Related issue:
https://issues.hibernatingrhinos.com/issue/RDoc-3179/Update-the-Cluster-Configuration
Updated the configuration article:
Documentation/6.2/Raven.Documentation.Pages/server/configuration/cluster-configuration.markdown
Updated only the values mentioned in:
Documentation/6.2/Raven.Documentation.Pages/server/clustering/distribution/cluster-observer.markdown