Chapter 4. Stopping and Starting Data Grid Services

Gracefully shut down Data Grid clusters to avoid data loss.

Cache configuration

Both Cache service and Data Grid service store permanent cache definitions in persistent volumes so they are still available after cluster restarts.

Data

Data Grid service nodes can write all cache entries to persistent storage during cluster shutdown if you add cache stores.

Important

You should configure the storage size for Data Grid service nodes to ensure that the persistent volume can hold all your data.

If the available container storage is less than the amount of memory available to Data Grid service nodes, Data Grid writes an exception to logs and data loss occurs during shutdown.

4.1. Gracefully Shutting Down Data Grid Clusters

  • Set the value of replicas to 0 and apply the changes. 
spec:
  replicas: 0

4.2. Restarting Data Grid Clusters

  • Set the value of spec.replicas to the same number of nodes that were in the cluster before you shut it down.

For example, you shut down a cluster of 6 nodes. When you restart the cluster, you must set: 

spec:
  replicas: 6

This allows Data Grid to restore the distribution of data across the cluster. When all nodes in the cluster are running, you can then add or remove nodes.