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Google Data Engineer Sample Questions:

1. Suppose you have a table that includes a nested column called "city" inside a column called "person", but when you try to submit the following query in BigQuery, it gives you an error.
SELECT person FROM `project1.example.table1` WHERE city = "London"
How would you correct the error?

A) Add ", UNNEST(person)" before the WHERE clause.
B) Change "person" to "city.person".
C) Add ", UNNEST(city)" before the WHERE clause.
D) Change "person" to "person.city".

2. You want to migrate an on-premises Hadoop system to Cloud Dataproc. Hive is the primary tool in use, and the data format is Optimized Row Columnar (ORC). All ORC files have been successfully copied to a Cloud Storage bucket. You need to replicate some data to the cluster's local Hadoop Distributed File System (HDFS) to maximize performance. What are two ways to start using Hive in Cloud Dataproc? (Choose two.)

A) Load the ORC files into BigQuer
B) Then run the Hadoop utility to copy them do HDF
C) Run the gsutil utility to transfer all ORC files from the Cloud Storage bucket to the master node of the Dataproc cluste
D) Run the gsutil utility to transfer all ORC files from the Cloud Storage bucket to HDF
E) Run the gsutil utility to transfer all ORC files from the Cloud Storage bucket to any node of the Dataproc cluste
F) Replicate external Hive tables to the native ones.
G) Mount the Hive tables from HDFS.
H) Replicate external Hive tables to the native ones.
I) Leverage BigQuery connector for Hadoop to mount the BigQuery tables as external Hive table
J) Mount the Hive tables locally.
K) Leverage Cloud Storage connector for Hadoop to mount the ORC files as external Hive table
L) Mount the Hive tables locally.

3. Which of these rules apply when you add preemptible workers to a Dataproc cluster (select 2 answers)?

A) Preemptible workers cannot store data.
B) If a preemptible worker is reclaimed, then a replacement worker must be added manually.
C) A Dataproc cluster cannot have only preemptible workers.
D) Preemptible workers cannot use persistent disk.

4. You need to deploy additional dependencies to all of a Cloud Dataproc cluster at startup using an existing initialization action. Company security policies require that Cloud Dataproc nodes do not have access to the Internet so public initialization actions cannot fetch resources. What should you do?

A) Copy all dependencies to a Cloud Storage bucket within your VPC security perimeter
B) Deploy the Cloud SQL Proxy on the Cloud Dataproc master
C) Use Resource Manager to add the service account used by the Cloud Dataproc cluster to the Network User role
D) Use an SSH tunnel to give the Cloud Dataproc cluster access to the Internet

5. By default, which of the following windowing behavior does Dataflow apply to unbounded data sets?

A) Single, Global Window
B) Windows at every 100 MB of data
C) Windows at every 10 minutes
D) Windows at every 1 minute

Solutions: