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NEW QUESTION 52
Which of the following statements about reducing out-of-memory errors is incorrect?

• A. Reducing partition size can help against out-of-memory errors.
• B. Decreasing the number of cores available to each executor can help against out-of-memory errors.
• C. Concatenating multiple string columns into a single column may guard against out-of-memory errors.
• D. Setting a limit on the maximum size of serialized data returned to the driver may help prevent out-of-memory errors.
• E. Limiting the amount of data being automatically broadcast in joins can help against out-of-memory errors.

Answer: C

Explanation:
Explanation
Concatenating multiple string columns into a single column may guard against out-of-memory errors.
Exactly, this is an incorrect answer! Concatenating any string columns does not reduce the size of the data, it just structures it a different way. This does little to how Spark processes the data and definitely does not reduce out-of-memory errors.
Reducing partition size can help against out-of-memory errors.
No, this is not incorrect. Reducing partition size is a viable way to aid against out-of-memory errors, since executors need to load partitions into memory before processing them. If the executor does not have enough memory available to do that, it will throw an out-of-memory error. Decreasing partition size can therefore be very helpful for preventing that.
Decreasing the number of cores available to each executor can help against out-of-memory errors.
No, this is not incorrect. To process a partition, this partition needs to be loaded into the memory of an executor. If you imagine that every core in every executor processes a partition, potentially in parallel with other executors, you can imagine that memory on the machine hosting the executors fills up quite quickly. So, memory usage of executors is a concern, especially when multiple partitions are processed at the same time. To strike a balance between performance and memory usage, decreasing the number of cores may help against out-of-memory errors.
Setting a limit on the maximum size of serialized data returned to the driver may help prevent out-of-memory errors.
No, this is not incorrect. When using commands like collect() that trigger the transmission of potentially large amounts of data from the cluster to the driver, the driver may experience out-of-memory errors. One strategy to avoid this is to be careful about using commands like collect() that send back large amounts of data to the driver. Another strategy is setting the parameter spark.driver.maxResultSize. If data to be transmitted to the driver exceeds the threshold specified by the parameter, Spark will abort the job and therefore prevent an out-of-memory error.
Limiting the amount of data being automatically broadcast in joins can help against out-of-memory errors.
Wrong, this is not incorrect. As part of Spark's internal optimization, Spark may choose to speed up operations by broadcasting (usually relatively small) tables to executors. This broadcast is happening from the driver, so all the broadcast tables are loaded into the driver first. If these tables are relatively big, or multiple mid-size tables are being broadcast, this may lead to an out-of- memory error. The maximum table size for which Spark will consider broadcasting is set by the spark.sql.autoBroadcastJoinThreshold parameter.
More info: Configuration - Spark 3.1.2 Documentation and Spark OOM Error - Closeup. Does the following look familiar when... | by Amit Singh Rathore | The Startup | Medium

NEW QUESTION 53
The code block displayed below contains an error. The code block should trigger Spark to cache DataFrame transactionsDf in executor memory where available, writing to disk where insufficient executor memory is available, in a fault-tolerant way. Find the error.
Code block:
transactionsDf.persist(StorageLevel.MEMORY_AND_DISK)

• A. The DataFrameWriter needs to be invoked.
• B. The storage level is inappropriate for fault-tolerant storage.
• C. Data caching capabilities can be accessed through the spark object, but not through the DataFrame API.
• D. Caching is not supported in Spark, data are always recomputed.
• E. The code block uses the wrong operator for caching.

Answer: B

Explanation:
Explanation
The storage level is inappropriate for fault-tolerant storage.
Correct. Typically, when thinking about fault tolerance and storage levels, you would want to store redundant copies of the dataset. This can be achieved by using a storage level such as StorageLevel.MEMORY_AND_DISK_2.
The code block uses the wrong command for caching.
Wrong. In this case, DataFrame.persist() needs to be used, since this operator supports passing a storage level.
DataFrame.cache() does not support passing a storage level.
Caching is not supported in Spark, data are always recomputed.
Incorrect. Caching is an important component of Spark, since it can help to accelerate Spark programs to great extent. Caching is often a good idea for datasets that need to be accessed repeatedly.
Data caching capabilities can be accessed through the spark object, but not through the DataFrame API.
No. Caching is either accessed through DataFrame.cache() or DataFrame.persist().
The DataFrameWriter needs to be invoked.
Wrong. The DataFrameWriter can be accessed via DataFrame.write and is used to write data to external data stores, mostly on disk. Here, we find keywords such as "cache" and "executor memory" that point us away from using external data stores. We aim to save data to memory to accelerate the reading process, since reading from disk is comparatively slower. The DataFrameWriter does not write to memory, so we cannot use it here.
More info: Best practices for caching in Spark SQL | by David Vrba | Towards Data Science

NEW QUESTION 54
The code block shown below should show information about the data type that column storeId of DataFrame transactionsDf contains. Choose the answer that correctly fills the blanks in the code block to accomplish this.
Code block:
transactionsDf.__1__(__2__).__3__

• A. 1. select
  2. "storeId"
  3. print_schema()
• B. 1. select
  2. "storeId"
  3. printSchema()
• C. 1. limit
  2. 1
  3. columns
• D. 1. limit
  2. "storeId"
  3. printSchema()
• E. 1. select
  2. storeId
  3. dtypes

Answer: C

Explanation:
Explanation
Correct code block:
transactionsDf.select("storeId").printSchema()
The difficulty of this question is that it is hard to solve with the stepwise first-to-last-gap approach that has worked well for similar questions, since the answer options are so different from one another. Instead, you might want to eliminate answers by looking for patterns of frequently wrong answers.
A first pattern that you may recognize by now is that column names are not expressed in quotes. For this reason, the answer that includes storeId should be eliminated.
By now, you may have understood that the DataFrame.limit() is useful for returning a specified amount of rows. It has nothing to do with specific columns. For this reason, the answer that resolves to limit("storeId") can be eliminated.
Given that we are interested in information about the data type, you should question whether the answer that resolves to limit(1).columns provides you with this information. While DataFrame.columns is a valid call, it will only report back column names, but not column types. So, you can eliminate this option.
The two remaining options either use the printSchema() or print_schema() command. You may remember that DataFrame.printSchema() is the only valid command of the two. The select("storeId") part just returns the storeId column of transactionsDf - this works here, since we are only interested in that column's type anyways.
More info: pyspark.sql.DataFrame.printSchema - PySpark 3.1.2 documentation Static notebook | Dynamic notebook: See test 3

NEW QUESTION 55
The code block displayed below contains an error. The code block should read the csv file located at path data/transactions.csv into DataFrame transactionsDf, using the first row as column header and casting the columns in the most appropriate type. Find the error.
First 3 rows of transactions.csv:
1.transactionId;storeId;productId;name
2.1;23;12;green grass
3.2;35;31;yellow sun
4.3;23;12;green grass
Code block:
transactionsDf = spark.read.load("data/transactions.csv", sep=";", format="csv", header=True)

• A. Spark is unable to understand the file type.
• B. The code block is unable to capture all columns.
• C. The transaction is evaluated lazily, so no file will be read.
• D. The resulting DataFrame will not have the appropriate schema.
• E. The DataFrameReader is not accessed correctly.

Answer: D

Explanation:
Explanation
Correct code block:
transactionsDf = spark.read.load("data/transactions.csv", sep=";", format="csv", header=True, inferSchema=True) By default, Spark does not infer the schema of the CSV (since this usually takes some time). So, you need to add the inferSchema=True option to the code block.
More info: pyspark.sql.DataFrameReader.csv - PySpark 3.1.2 documentation

NEW QUESTION 56
Which of the following code blocks shuffles DataFrame transactionsDf, which has 8 partitions, so that it has
10 partitions?

• A. transactionsDf.repartition(transactionsDf._partitions+2)
• B. transactionsDf.repartition(transactionsDf.rdd.getNumPartitions()+2)
• C. transactionsDf.coalesce(10)
• D. transactionsDf.coalesce(transactionsDf.getNumPartitions()+2)
• E. transactionsDf.repartition(transactionsDf.getNumPartitions()+2)

Answer: B

Explanation:
Explanation
transactionsDf.repartition(transactionsDf.rdd.getNumPartitions()+2)
Correct. The repartition operator is the correct one for increasing the number of partitions. calling getNumPartitions() on DataFrame.rdd returns the current number of partitions.
transactionsDf.coalesce(10)
No, after this command transactionsDf will continue to only have 8 partitions. This is because coalesce() can only decreast the amount of partitions, but not increase it.
transactionsDf.repartition(transactionsDf.getNumPartitions()+2)
Incorrect, there is no getNumPartitions() method for the DataFrame class.
transactionsDf.coalesce(transactionsDf.getNumPartitions()+2)
Wrong, coalesce() can only be used for reducing the number of partitions and there is no getNumPartitions() method for the DataFrame class.
transactionsDf.repartition(transactionsDf._partitions+2)
No, DataFrame has no _partitions attribute. You can find out the current number of partitions of a DataFrame with the DataFrame.rdd.getNumPartitions() method.
More info: pyspark.sql.DataFrame.repartition - PySpark 3.1.2 documentation, pyspark.RDD.getNumPartitions - PySpark 3.1.2 documentation Static notebook | Dynamic notebook: See test 3

NEW QUESTION 57
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