Logging

The Spark operator installs a vector agent as a side-car container in every application Pod except the job Pod that runs spark-submit. It also configures the logging framework to output logs in XML format. This is the same format used across all Stackable products and it enables the vector aggregator to collect logs across the entire platform.

It is the user’s responsibility to install and configure the vector aggregator, but the agents can discover the aggregator automatically using a discovery ConfigMap as described in the logging concepts.

Only logs produced by the application’s driver and executors are collected. Logs produced by spark-submit are discarded.

History server

The following snippet shows how to configure log aggregation for the history server:

apiVersion: spark.stackable.tech/v1alpha1
kind: SparkHistoryServer
metadata:
  name: spark-history
spec:
  vectorAggregatorConfigMapName: spark-vector-aggregator-discovery (1)
  nodes:
    roleGroups:
      default:
        config:
          logging:
            enableVectorAgent: true (2)
            containers:
              spark-history: (3)
                console:
                  level: INFO
                file:
                  level: INFO
                loggers:
                  ROOT:
                    level: INFO
...

1	Name of a ConfigMap that referenced the vector aggregator. See example below.
2	Enable the vector agent in the history pod.
3	Configure log levels for file and console outputs.

Example vector aggregator configuration.

---
apiVersion: v1
kind: ConfigMap
metadata:
  name: spark-vector-aggregator-discovery
data:
  ADDRESS: spark-vector-aggregator:6123