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DCAD test Format | Course Contents | Course Outline | test Syllabus | test Objectives
Exam Details for DCAD Databricks Certified Associate Developer for Apache Spark 3.0:
Number of Questions: The test consists of approximately 60 multiple-choice and multiple-select questions.
Time Limit: The total time allocated for the test is 90 minutes (1 hour and 30 minutes).
Passing Score: To pass the exam, you must achieve a minimum score of 70%.
Exam Format: The test is conducted online and is proctored. You will be required to answer the questions within the allocated time frame.
Course Outline:
1. Spark Basics:
- Understanding Apache Spark architecture and components
- Working with RDDs (Resilient Distributed Datasets)
- Transformations and actions in Spark
2. Spark SQL:
- Working with structured data using Spark SQL
- Writing and executing SQL queries in Spark
- DataFrame operations and optimizations
3. Spark Streaming:
- Real-time data processing with Spark Streaming
- Windowed operations and time-based transformations
- Integration with external systems and sources
4. Spark Machine Learning (MLlib):
- Introduction to machine learning with Spark MLlib
- Feature extraction and transformation in Spark MLlib
- Model training and evaluation using Spark MLlib
5. Spark Graph Processing (GraphX):
- Working with graph data in Spark using GraphX
- Graph processing algorithms and operations
- Analyzing and visualizing graph data in Spark
6. Spark Performance Tuning and Optimization:
- Identifying and resolving performance bottlenecks in Spark applications
- Spark configuration and tuning techniques
- Optimization strategies for Spark data processing
Exam Objectives:
1. Understand the fundamentals of Apache Spark and its components.
2. Perform data processing and transformations using RDDs.
3. Utilize Spark SQL for structured data processing and querying.
4. Implement real-time data processing using Spark Streaming.
5. Apply machine learning techniques with Spark MLlib.
6. Analyze and process graph data using Spark GraphX.
7. Optimize and tune Spark applications for improved performance.
Exam Syllabus:
The test syllabus covers the following topics:
1. Spark Basics
- Apache Spark architecture and components
- RDDs (Resilient Distributed Datasets)
- Transformations and actions in Spark
2. Spark SQL
- Spark SQL and structured data processing
- SQL queries and DataFrame operations
- Spark SQL optimizations
3. Spark Streaming
- Real-time data processing with Spark Streaming
- Windowed operations and time-based transformations
- Integration with external systems
4. Spark Machine Learning (MLlib)
- Introduction to machine learning with Spark MLlib
- Feature extraction and transformation
- Model training and evaluation
5. Spark Graph Processing (GraphX)
- Graph data processing in Spark using GraphX
- Graph algorithms and operations
- Graph analysis and visualization
6. Spark Performance Tuning and Optimization
- Performance bottlenecks and optimization techniques
- Spark configuration and tuning
- Optimization strategies for data processing
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Question: 386
Which of the following code blocks removes all rows in the 6-column DataFrame transactionsDf that have missing
data in at least 3 columns?
A. transactionsDf.dropna("any")
B. transactionsDf.dropna(thresh=4)
C. transactionsDf.drop.na("",2)
D. transactionsDf.dropna(thresh=2)
E. transactionsDf.dropna("",4)
Answer: B
Explanation:
transactionsDf.dropna(thresh=4)
Correct. Note that by only working with the thresh keyword argument, the first how keyword argument is ignored.
Also, figuring out which value to set for thresh can be difficult, especially when
under pressure in the exam. Here, I recommend you use the notes to create a "simulation" of what different values for
thresh would do to a DataFrame. Here is an explanatory image why thresh=4 is
the correct answer to the question:
transactionsDf.dropna(thresh=2)
Almost right. See the comment about thresh for the correct answer above. transactionsDf.dropna("any")
No, this would remove all rows that have at least one missing value.
transactionsDf.drop.na("",2)
No, drop.na is not a proper DataFrame method.
transactionsDf.dropna("",4)
No, this does not work and will throw an error in Spark because Spark cannot understand the first argument.
More info: pyspark.sql.DataFrame.dropna - PySpark 3.1.1 documentation (https://bit.ly/2QZpiCp)
Static notebook | Dynamic notebook: See test 1,
Question: 387
"left_semi"
Answer: C
Explanation:
Correct code block:
transactionsDf.join(broadcast(itemsDf), "transactionId", "left_semi")
This QUESTION NO: is extremely difficult and exceeds the difficulty of questions in the test by far.
A first indication of what is asked from you here is the remark that "the query should be executed in an optimized
way". You also have qualitative information about the size of itemsDf and transactionsDf. Given that itemsDf is "very
small" and that the execution should be optimized, you should consider instructing Spark to perform a broadcast join,
broadcasting the "very small" DataFrame itemsDf to all executors. You can explicitly suggest this to Spark via
wrapping itemsDf into a broadcast() operator. One answer option does not include this operator, so you can disregard
it. Another answer option wraps the broadcast() operator around transactionsDf the bigger of the two DataFrames.
This answer option does not make sense in the optimization context and can likewise be disregarded.
When thinking about the broadcast() operator, you may also remember that it is a method of pyspark.sql.functions. One
answer option, however, resolves to itemsDf.broadcast([]). The DataFrame
class has no broadcast() method, so this answer option can be eliminated as well.
All two remaining answer options resolve to transactionsDf.join([]) in the first 2 gaps, so you will have to figure out
the details of the join now. You can pick between an outer and a left semi join. An outer join would include columns
from both DataFrames, where a left semi join only includes columns from the "left" table, here transactionsDf, just as
asked for by the question. So, the correct answer is the one that uses the left_semi join.
Question: 388
Which of the elements that are labeled with a circle and a number contain an error or are misrepresented?
A. 1, 10
B. 1, 8
C. 10
D. 7, 9, 10
E. 1, 4, 6, 9
Answer: B
Explanation:
1: Correct C This should just read "API" or "DataFrame API". The DataFrame is not part of the SQL API. To make a
DataFrame accessible via SQL, you first need to create a DataFrame view. That view can then be accessed via SQL.
4: Although "K_38_INU" looks odd, it is a completely valid name for a DataFrame column.
6: No, StringType is a correct type.
7: Although a StringType may not be the most efficient way to store a phone number, there is nothing fundamentally
wrong with using this type here.
8: Correct C TreeType is not a type that Spark supports.
9: No, Spark DataFrames support ArrayType variables. In this case, the variable would represent a sequence of
elements with type LongType, which is also a valid type for Spark DataFrames.
10: There is nothing wrong with this row.
More info: Data Types Spark 3.1.1 Documentation (https://bit.ly/3aAPKJT)
Question: 389
Which of the following code blocks stores DataFrame itemsDf in executor memory and, if insufficient memory is
available, serializes it and saves it to disk?
A. itemsDf.persist(StorageLevel.MEMORY_ONLY)
B. itemsDf.cache(StorageLevel.MEMORY_AND_DISK)
C. itemsDf.store()
D. itemsDf.cache()
E. itemsDf.write.option(destination, memory).save()
Answer: D
Explanation:
The key to solving this QUESTION NO: is knowing (or studying in the documentation) that, by default, cache() stores
values to memory and writes any partitions for which there is insufficient memory
to disk. persist() can achieve the exact same behavior, however not with the StorageLevel.MEMORY_ONLY option
listed here. It is also worth noting that cache() does not have any arguments.
If you have troubles finding the storage level information in the documentation, please also see this student Q&A
thread that sheds some light here.
Static notebook | Dynamic notebook: See test 2,
Question: 390
Which of the following code blocks can be used to save DataFrame transactionsDf to memory only, recalculating
partitions that do not fit in memory when they are needed?
A. from pyspark import StorageLevel transactionsDf.cache(StorageLevel.MEMORY_ONLY)
B. transactionsDf.cache()
C. transactionsDf.storage_level(MEMORY_ONLY)
D. transactionsDf.persist()
E. transactionsDf.clear_persist()
F. from pyspark import StorageLevel transactionsDf.persist(StorageLevel.MEMORY_ONLY)
Answer: F
Explanation:
from pyspark import StorageLevel transactionsDf.persist(StorageLevel.MEMORY_ONLY) Correct. Note that the
storage level MEMORY_ONLY means that all partitions that do not fit into memory will be recomputed when they are
needed. transactionsDf.cache()
This is wrong because the default storage level of DataFrame.cache() is
MEMORY_AND_DISK, meaning that partitions that do not fit into memory are stored on disk.
transactionsDf.persist()
This is wrong because the default storage level of DataFrame.persist() is
MEMORY_AND_DISK.
transactionsDf.clear_persist()
Incorrect, since clear_persist() is not a method of DataFrame.
transactionsDf.storage_level(MEMORY_ONLY)
Wrong. storage_level is not a method of DataFrame.
More info: RDD Programming Guide Spark 3.0.0 Documentation, pyspark.sql.DataFrame.persist - PySpark 3.0.0
documentation (https://bit.ly/3sxHLVC , https://bit.ly/3j2N6B9)
Question: 391
"left_semi"
Answer: C
Explanation:
Correct code block:
transactionsDf.join(broadcast(itemsDf), "transactionId", "left_semi")
This QUESTION NO: is extremely difficult and exceeds the difficulty of questions in the test by far.
A first indication of what is asked from you here is the remark that "the query should be executed in an optimized
way". You also have qualitative information about the size of itemsDf and transactionsDf. Given that itemsDf is "very
small" and that the execution should be optimized, you should consider instructing Spark to perform a broadcast join,
broadcasting the "very small" DataFrame itemsDf to all executors. You can explicitly suggest this to Spark via
wrapping itemsDf into a broadcast() operator. One answer option does not include this operator, so you can disregard
it. Another answer option wraps the broadcast() operator around transactionsDf the bigger of the two DataFrames.
This answer option does not make sense in the optimization context and can likewise be disregarded.
When thinking about the broadcast() operator, you may also remember that it is a method of pyspark.sql.functions. One
answer option, however, resolves to itemsDf.broadcast([]). The DataFrame
class has no broadcast() method, so this answer option can be eliminated as well.
All two remaining answer options resolve to transactionsDf.join([]) in the first 2 gaps, so you will have to figure out
the details of the join now. You can pick between an outer and a left semi join. An outer join would include columns
from both DataFrames, where a left semi join only includes columns from the "left" table, here transactionsDf, just as
asked for by the question. So, the correct answer is the one that uses the left_semi join.
Question: 392
Which of the following describes tasks?
A. A task is a command sent from the driver to the executors in response to a transformation.
B. Tasks transform jobs into DAGs.
C. A task is a collection of slots.
D. A task is a collection of rows.
E. Tasks get assigned to the executors by the driver.
Answer: E
Explanation:
Tasks get assigned to the executors by the driver.
Correct! Or, in other words: Executors take the tasks that they were assigned to by the driver, run them over partitions,
and report the their outcomes back to the driver. Tasks transform jobs into DAGs.
No, this statement disrespects the order of elements in the Spark hierarchy. The Spark driver transforms jobs into
DAGs. Each job consists of one or more stages. Each stage contains one or more
tasks.
A task is a collection of rows.
Wrong. A partition is a collection of rows. Tasks have little to do with a collection of rows. If anything, a task
processes a specific partition.
A task is a command sent from the driver to the executors in response to a transformation. Incorrect. The Spark driver
does not send anything to the executors in response to a transformation, since transformations are evaluated lazily. So,
the Spark driver would send tasks to executors
only in response to actions.
A task is a collection of slots.
No. Executors have one or more slots to process tasks and each slot can be assigned a task.
Question: 393
Which of the following code blocks reads in parquet file /FileStore/imports.parquet as a
DataFrame?
A. spark.mode("parquet").read("/FileStore/imports.parquet")
B. spark.read.path("/FileStore/imports.parquet", source="parquet")
C. spark.read().parquet("/FileStore/imports.parquet")
D. spark.read.parquet("/FileStore/imports.parquet")
E. spark.read().format(parquet).open("/FileStore/imports.parquet")
Answer: D
Explanation:
Static notebook | Dynamic notebook: See test 1,
Question: 394
Which of the elements that are labeled with a circle and a number contain an error or are misrepresented?
A. 1, 10
B. 1, 8
C. 10
D. 7, 9, 10
E. 1, 4, 6, 9
Answer: B
Explanation:
1: Correct C This should just read "API" or "DataFrame API". The DataFrame is not part of the SQL API. To make a
DataFrame accessible via SQL, you first need to create a DataFrame view. That view can then be accessed via SQL.
4: Although "K_38_INU" looks odd, it is a completely valid name for a DataFrame column.
6: No, StringType is a correct type.
7: Although a StringType may not be the most efficient way to store a phone number, there is nothing fundamentally
wrong with using this type here.
8: Correct C TreeType is not a type that Spark supports.
9: No, Spark DataFrames support ArrayType variables. In this case, the variable would represent a sequence of
elements with type LongType, which is also a valid type for Spark DataFrames.
10: There is nothing wrong with this row.
More info: Data Types Spark 3.1.1 Documentation (https://bit.ly/3aAPKJT)
Question: 395
"left_semi"
Answer: C
Explanation:
Correct code block:
transactionsDf.join(broadcast(itemsDf), "transactionId", "left_semi")
This QUESTION NO: is extremely difficult and exceeds the difficulty of questions in the test by far.
A first indication of what is asked from you here is the remark that "the query should be executed in an optimized
way". You also have qualitative information about the size of itemsDf and transactionsDf. Given that itemsDf is "very
small" and that the execution should be optimized, you should consider instructing Spark to perform a broadcast join,
broadcasting the "very small" DataFrame itemsDf to all executors. You can explicitly suggest this to Spark via
wrapping itemsDf into a broadcast() operator. One answer option does not include this operator, so you can disregard
it. Another answer option wraps the broadcast() operator around transactionsDf the bigger of the two DataFrames.
This answer option does not make sense in the optimization context and can likewise be disregarded.
When thinking about the broadcast() operator, you may also remember that it is a method of pyspark.sql.functions. One
answer option, however, resolves to itemsDf.broadcast([]). The DataFrame
class has no broadcast() method, so this answer option can be eliminated as well.
All two remaining answer options resolve to transactionsDf.join([]) in the first 2 gaps, so you will have to figure out
the details of the join now. You can pick between an outer and a left semi join. An outer join would include columns
from both DataFrames, where a left semi join only includes columns from the "left" table, here transactionsDf, just as
asked for by the question. So, the correct answer is the one that uses the left_semi join.
Question: 396
Which of the elements that are labeled with a circle and a number contain an error or are misrepresented?
A. 1, 10
B. 1, 8
C. 10
D. 7, 9, 10
E. 1, 4, 6, 9
Answer: B
Explanation:
1: Correct C This should just read "API" or "DataFrame API". The DataFrame is not part of the SQL API. To make a
DataFrame accessible via SQL, you first need to create a DataFrame view. That view can then be accessed via SQL.
4: Although "K_38_INU" looks odd, it is a completely valid name for a DataFrame column.
6: No, StringType is a correct type.
7: Although a StringType may not be the most efficient way to store a phone number, there is nothing fundamentally
wrong with using this type here.
8: Correct C TreeType is not a type that Spark supports.
9: No, Spark DataFrames support ArrayType variables. In this case, the variable would represent a sequence of
elements with type LongType, which is also a valid type for Spark DataFrames.
10: There is nothing wrong with this row.
More info: Data Types Spark 3.1.1 Documentation (https://bit.ly/3aAPKJT)
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DCAD Spark real Questions
DCAD Spark real questions :: Article Creatorecu MDR Challenges Spark Questions
presently, both latest CE-mark instruments and contraptions hoping to be bought in the European Union (european) face fundamental challenges within the conformity evaluation technique for market entry. right through his session, “biggest Challenges faced via scientific equipment manufacturers in the eu,” at the fresh BIOMEDevice Boston, MA, Antal Solyom, director of the clinical gadget Unit at HungeroTrial, specified the leading bottlenecks and challenges going on because the scientific device law (MDR) rollout continues.
The MDR, which was issued in 2017, grew to be completely applicable in may 2021 after a one-yr postponement, overruling the scientific device Directive (MDD). Now, all certificates issued below MDD will expire in 2027-2028 beneath specific conditions, delayed from its fashioned expiration of 2024 due to the overwhelming numbers of purposes in need of re-certification.
The explanation for the prolong, in keeping with Solyom, is that 23,700 certificates beneath MDD will expire in 2024 and people re-certification situations are being break up between 38 notified their bodies under the eu. most effective 2,950 certificates have been issued beneath MDR through March 2023. seeing that the roll out of MDR, he noted that the commonplace workload of a notified body has accelerated by way of forty three% for a certification, and the regular processing time is eighteen months. moreover, 85% of the technical documentation submitted to notified their bodies within the MDR software is submitted incomplete, meaning that it's rejected, causing additional delays.
“Notified their bodies are overloaded — most of them do not settle for new valued clientele,” Solyom observed, carrying on with that about 16% are not accepting MDR functions for brand new medical devices. “The MDR is new also for the notified bodies, for this reason delays will also be anticipated within the certification method.”
The postponement, despite the fact, is simply for the notified bodies, now not the producers, meaning that corporations should nonetheless adhere to the 2024 time limits.
through the transition to MDR, instruments hoping to keep the mark should have lodged a proper utility to one of the most 38 notified their bodies on the market before may also 2024, have nice management systems in area before may additionally 2024, and have a signed agreement between the brand and notified their bodies before September 2024.
One main change producers have to take care of is that for definite chance classification items, the medical records submitted for certification ought to come from a scientific investigation. notwithstanding the product has been on the market for years, the rules remain the identical. If the present CE-marked product is applying for the same supposed uses under MDR, manufacturers are capable of go the PMCF medical investigation route, which is a whole lot shorter and less expensive. youngsters, if an current machine needs so as to add a brand new meant use, or a newly designed machine is making use of for the CE-mark, it should undertake a full scientific investigation, which is greater costly and takes a whole lot longer to finished.
different changes and challenges manufacturers must be privy to consist of the increased amount of technical documentation needed for the MDR, updates to the clinical evaluation consultation procedure with authorities, a transformation in labeling requirements, the implementation of the unique gadget Identification (UDI) system, in addition to periodic reports that must be provided to the notified their bodies like the clinical contrast file, submit Market scientific follow-up file, and Periodic protection update assist.
in the session, Solyom advised taking urgent motion if a corporation’s CE-marks can be suffering from MDR. He entreated manufacturers to get involved with their notified their bodies and installation a strategy plan — paying eager consideration to due dates, compile as much PMS records as possible from the past, do a spot evaluation to have in mind if a device has enough clinical records to agree to MDR necessities, and fasten with a CRO to help with the medical investigation if crucial.
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