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Solr Volume Expansion

This guide will give an overview on how KubeDB Ops-manager operator expand the volume of various component of Solr like:. (Combined and Topology).

Before You Begin

• You should be familiar with the following KubeDB concepts:
  • Solr
  • SolrOpsRequest

How Volume Expansion Process Works

The following diagram shows how KubeDB Ops-manager operator expand the volumes of Solr database components. Open the image in a new tab to see the enlarged version.

  

The Volume Expansion process consists of the following steps:

1. At first, a user creates a Solr Custom Resource (CR).

2. KubeDB Provisioner operator watches the Solr CR.

3. When the operator finds a Solr CR, it creates required number of PetSets and related necessary stuff like secrets, services, etc.

4. Each PetSet creates a Persistent Volume according to the Volume Claim Template provided in the petset configuration. This Persistent Volume will be expanded by the KubeDB Ops-manager operator.

5. Then, in order to expand the volume of the various components (ie. Combined, Broker, Controller) of the Solr, the user creates a SolrOpsRequest CR with desired information.

6. KubeDB Ops-manager operator watches the SolrOpsRequest CR.

7. When it finds a SolrOpsRequest CR, it halts the Solr object which is referred from the SolrOpsRequest. So, the KubeDB Provisioner operator doesn’t perform any operations on the Solr object during the volume expansion process.

8. Then the KubeDB Ops-manager operator will expand the persistent volume to reach the expected size defined in the SolrOpsRequest CR.

9. After the successful Volume Expansion of the related PetSet Pods, the KubeDB Ops-manager operator updates the new volume size in the Solr object to reflect the updated state.

10. After the successful Volume Expansion of the Solr components, the KubeDB Ops-manager operator resumes the Solr object so that the KubeDB Provisioner operator resumes its usual operations.

In the next docs, we are going to show a step-by-step guide on Volume Expansion of various Solr database components using SolrOpsRequest CRD.