Hotfix/ui view

.docs/api/data-service.md

@@ -28,8 +28,23 @@ The Data Service is responsible for inserting AMQP tuples from the Broker Servic
 via [Spring AMQP](https://docs.spring.io/spring-amqp/reference/html/). To increase the number of consumers, scale the
 Data Service up.
 
+## Data Processing
+
+The Data Service uses [Apache Spark](https://spark.apache.org/), a data engine to load data from/into 
+the [Data Database](../data-db) with a wide range of open-source connectors. The default deployment uses a local mode of
+embedded processing directly in the service until there exists 
+a [Bitnami Chart](https://artifacthub.io/packages/helm/bitnami/spark) for Spark 4.
+
+Retrieving data from a subset internally generates a view with the 64-character hash of the query. This view is not
+automatically deleted currently.
+
 ## Limitations
 
+* Views in DBRepo can only have 63-character length (it is assumed only internal views have the maximum length of 64 
+  characters).
+* Local mode of embedded processing of Apache Spark directly in the service using 
+  a [`local[2]`](https://spark.apache.org/docs/latest/#running-the-examples-and-shell) configuration.
+
 !!! question "Do you miss functionality? Do these limitations affect you?"
 
     We strongly encourage you to help us implement it as we are welcoming contributors to open-source software and get