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Chapter 3. Creating Data Grid Services

Data Grid services are stateful applications that provide flexible and robust in-memory data storage.

3.1. Cache Service
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Cache service provides a volatile, low-latency data store that dramatically increases application response rates.

Cache service nodes:

  • Synchronously distribute data across the cluster to ensure consistency.
  • Maintain single copies of cache entries to reduce size.
  • Store cache entries off-heap and use eviction for JVM efficiency.
  • Ensure data consistency with a default partition handling configuration.
Important

You can create multiple cache definitions with Cache service but only as copies of the default configuration.

If you update Cache service nodes with the Infinispan CR or update the version, you lose all data in the cache.

3.1.1. Cache Configuration
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Cache service nodes use the following cache configuration: 

<distributed-cache name="default"
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                   mode="SYNC"
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                   owners="1">
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   <memory>
    <off-heap eviction="MEMORY"
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              strategy="REMOVE"/>
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   </memory>
   <partition-handling when-split="ALLOW_READ_WRITES"
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                       merge-policy="REMOVE_ALL"/>
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</distributed-cache>
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1
Names the cache instance as "default".
2
Uses synchronous distribution for storing data across the cluster.
3
Configures one replica for each cache entry across the cluster.
4
Stores cache entries as bytes in native memory (off-heap).
5
Removes old entries to make space when adding new entries.
6
Specifies a conflict resolution strategy that allows read and write operations for cache entries even if segment owners are in different partitions.
7
Specifies a merge policy that removes entries from the cache when Data Grid detects conflicts.

3.2. Data Grid Service
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Data Grid service provides a configurable Data Grid server distribution for OpenShift.

  • Use with advanced capabilities like cross-site replication as well as indexing and querying.

  • Remotely access Data Grid service clusters from Hot Rod or REST clients and dynamically create caches using any Data Grid cache mode and configuration.

    Note

    Data Grid does not provide default caches for Data Grid service nodes. However, you can use cache configuration templates to get started.

3.3. Creating Data Grid Services
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Define the .spec.service.type resource to create Cache service and Data Grid service nodes with Data Grid Operator.

By default, Data Grid Operator creates Data Grid clusters configured as a Cache service.

Procedure

  • Specify the service type for Data Grid clusters with spec.service.type in your Infinispan CR and then apply the changes.

For example, create Data Grid service clusters as follows: 

spec:
  ...
  service:
    type: DataGrid
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Important

You cannot change .spec.service.type after you create Data Grid clusters.

For example, if you create a cluster of Cache service nodes, you cannot change the service type to Data Grid service. In this case you must create a new cluster with Data Grid service nodes in a different OpenShift namespace.

Reference

3.3.1. Cache Service Resources
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apiVersion: infinispan.org/v1
kind: Infinispan
metadata:
  name: example-rhdatagrid
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spec:
  replicas: 4
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  service:
    type: Cache
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  security:
    endpointSecretName: endpoint-identities
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    endpointEncryption:
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        type: secret
        certSecretName: tls-secret
  container:
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    extraJvmOpts: "-XX:NativeMemoryTracking=summary"
    cpu: "2000m"
    memory: 1Gi
  logging:
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    categories:
      org.infinispan: trace
      org.jgroups: trace
  expose:
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    type: LoadBalancer
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1
Names the Data Grid cluster.
2
Specifies the number of nodes in the cluster.
3
Creates Cache service clusters.
4
Adds an authentication secret with user credentials.
5
Adds a custom encryption secret for secure connections.
6
Allocates resources to nodes.
7
Configures logging.
8
Configures services for external traffic.

3.3.2. Data Grid Service Resources
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apiVersion: infinispan.org/v1
kind: Infinispan
metadata:
  name: example-rhdatagrid
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spec:
  replicas: 6
2 

  service:
    type: DataGrid
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    container:
      storage: 2Gi
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    sites:
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      local:
        expose:
          type: LoadBalancer
      locations:
      - name: azure
        url: openshift://api.azure.host:6443
        secretName: azure-identities
      - name: aws
        url: openshift://api.aws.host:6443
        secretName: aws-identities
  security:
    endpointSecretName: endpoint-identities
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    endpointEncryption:
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        type: secret
        certSecretName: tls-secret
  container:
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    extraJvmOpts: "-XX:NativeMemoryTracking=summary"
    cpu: "1000m"
    memory: 1Gi
  logging:
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    categories:
      org.infinispan: debug
      org.jgroups: debug
  expose:
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    type: LoadBalancer
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1
Names the Data Grid cluster.
2
Specifies the number of nodes in the cluster.
3
Creates Data Grid service clusters.
4
Configures size of the persistent volume.
5
Provides connection information for backup locations.
6
Adds an authentication secret with user credentials.
7
Adds a custom encryption secret for secure connections.
8
Allocates resources to nodes.
9
Configures logging.
10
Configures services for external traffic.
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