Code snippets and notes on running Apache Spark with Kubernetes. Focus on running Spark Core and Spark SQL application with Kubernetes on S3 object storage.
Hive Metastore is required to manage table schema and query data in S3 via Spark SQl.
We use Postgresql for Hive Metastore backend database. Follow this Postgres Operator's instruction to deploy a Postgresql service on Kubernetes.
Deploy a Postgresql with the Postgres Operator.
kubectl create -f reddot-cluster.yaml
This will create a Postgresql service, along with a metastore database, hive user and its secret.
Decode the secret to restrieve hive user's password.
At this point, we should be able to connect to the metastore database.
psql -h <Postgres_pod_IP> -U hive -W metastore
Initialize metastore schema and deploy the Hive Metastore service.
Credits: Some code are based on Joshua Robison's awesome work.