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NEW QUESTION 34
Which of the following code blocks returns a DataFrame with an added column to DataFrame transactionsDf that shows the unix epoch timestamps in column transactionDate as strings in the format month/day/year in column transactionDateFormatted?
Excerpt of DataFrame transactionsDf:
Answer: A
Explanation:
Explanation
transactionsDf.withColumn("transactionDateFormatted", from_unixtime("transactionDate", format="MM/dd/yyyy")) Correct. This code block adds a new column with the name transactionDateFormatted to DataFrame transactionsDf, using Spark's from_unixtime method to transform values in column transactionDate into strings, following the format requested in the question.
transactionsDf.withColumn("transactionDateFormatted", from_unixtime("transactionDate", format="dd/MM/yyyy")) No. Although almost correct, this uses the wrong format for the timestamp to date conversion: day/month/year instead of month/day/year.
transactionsDf.withColumnRenamed("transactionDate", "transactionDateFormatted", from_unixtime("transactionDateFormatted", format="MM/dd/yyyy")) Incorrect. This answer uses wrong syntax. The command DataFrame.withColumnRenamed() is for renaming an existing column only has two string parameters, specifying the old and the new name of the column.
transactionsDf.apply(from_unixtime(format="MM/dd/yyyy")).asColumn("transactionDateFormatted") Wrong. Although this answer looks very tempting, it is actually incorrect Spark syntax. In Spark, there is no method DataFrame.apply(). Spark has an apply() method that can be used on grouped data - but this is irrelevant for this question, since we do not deal with grouped data here.
transactionsDf.withColumn("transactionDateFormatted", from_unixtime("transactionDate")) No. Although this is valid Spark syntax, the strings in column transactionDateFormatted would look like this:
2020-04-26 15:35:32, the default format specified in Spark for from_unixtime and not what is asked for in the question.
More info: pyspark.sql.functions.from_unixtime - PySpark 3.1.1 documentation and pyspark.sql.DataFrame.withColumnRenamed - PySpark 3.1.1 documentation Static notebook | Dynamic notebook: See test 1
NEW QUESTION 35
Which of the following statements about lazy evaluation is incorrect?
Answer: A
Explanation:
Explanation
Execution is triggered by transformations.
Correct. Execution is triggered by actions only, not by transformations.
Lineages allow Spark to coalesce transformations into stages.
Incorrect. In Spark, lineage means a recording of transformations. This lineage enables lazy evaluation in Spark.
Predicate pushdown is a feature resulting from lazy evaluation.
Wrong. Predicate pushdown means that, for example, Spark will execute filters as early in the process as possible so that it deals with the least possible amount of data in subsequent transformations, resulting in a performance improvements.
Accumulators do not change the lazy evaluation model of Spark.
Incorrect. In Spark, accumulators are only updated when the query that refers to the is actually executed. In other words, they are not updated if the query is not (yet) executed due to lazy evaluation.
Spark will fail a job only during execution, but not during definition.
Wrong. During definition, due to lazy evaluation, the job is not executed and thus certain errors, for example reading from a non-existing file, cannot be caught. To be caught, the job needs to be executed, for example through an action.
NEW QUESTION 36
Which of the following describes how Spark achieves fault tolerance?
Answer: D
Explanation:
Explanation
Due to the mutability of DataFrames after transformations, Spark reproduces them using observed lineage in case of worker node failure.
Wrong - Between transformations, DataFrames are immutable. Given that Spark also records the lineage, Spark can reproduce any DataFrame in case of failure. These two aspects are the key to understanding fault tolerance in Spark.
Spark builds a fault-tolerant layer on top of the legacy RDD data system, which by itself is not fault tolerant.
Wrong. RDD stands for Resilient Distributed Dataset and it is at the core of Spark and not a "legacy system".
It is fault-tolerant by design.
Spark helps fast recovery of data in case of a worker fault by providing the MEMORY_AND_DISK storage level option.
This is not true. For supporting recovery in case of worker failures, Spark provides "_2", "_3", and so on, storage level options, for example MEMORY_AND_DISK_2. These storage levels are specifically designed to keep duplicates of the data on multiple nodes. This saves time in case of a worker fault, since a copy of the data can be used immediately, vs. having to recompute it first.
Spark is only fault-tolerant if this feature is specifically enabled via the spark.fault_recovery.enabled property.
No, Spark is fault-tolerant by design.
NEW QUESTION 37
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