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NEW QUESTION: 1
Answer:
Explanation:
Explanation
After taking a lock you must check once again the _inventory field to be sure that other threads didn't instantiated it in the meantime.
First, you check if the inventory is null, if so, you lock it to avoid other threads to change it.
Second, you check again for the null, as in the tiny millisecond between check for null and locking could another thread get it.
Finally you create the instance and release the lock.
NEW QUESTION: 2
CORRECT TEXT
Problem Scenario 49 : You have been given below code snippet (do a sum of values by key}, with intermediate output.
val keysWithValuesList = Array("foo=A", "foo=A", "foo=A", "foo=A", "foo=B", "bar=C",
"bar=D", "bar=D")
val data = sc.parallelize(keysWithValuesl_ist}
//Create key value pairs
val kv = data.map(_.split("=")).map(v => (v(0), v(l))).cache()
val initialCount = 0;
val countByKey = kv.aggregateByKey(initialCount)(addToCounts, sumPartitionCounts)
Now define two functions (addToCounts, sumPartitionCounts) such, which will produce following results.
Output 1
countByKey.collect
res3: Array[(String, Int)] = Array((foo,5), (bar,3))
import scala.collection._
val initialSet = scala.collection.mutable.HashSet.empty[String]
val uniqueByKey = kv.aggregateByKey(initialSet)(addToSet, mergePartitionSets)
Now define two functions (addToSet, mergePartitionSets) such, which will produce following results.
Output 2:
uniqueByKey.collect
res4: Array[(String, scala.collection.mutable.HashSet[String])] = Array((foo,Set(B, A}},
(bar,Set(C, D}}}
Answer:
Explanation:
See the explanation for Step by Step Solution and configuration.
Explanation:
Solution :
val addToCounts = (n: Int, v: String) => n + 1
val sumPartitionCounts = (p1: Int, p2: Int} => p1 + p2
val addToSet = (s: mutable.HashSet[String], v: String) => s += v
val mergePartitionSets = (p1: mutable.HashSet[String], p2: mutable.HashSet[String]) => p1
+ += p2
NEW QUESTION: 3
You are designing an Azure web application that includes many static content files.
The application is accessed from locations all over the world by using a custom domain name.
You need to recommend an approach for providing access to the static content with the least amount of latency.
Which two actions should you recommend? Each correct answer presents part of the solution.
A. Place the static content in Azure Blob.
B. Configure a custom domain name that is an alias for the Azure Storage domain.
C. Place the static content in Azure Table storage.
D. Configure a CNAME DNS record for the Azure Content Delivery Network (CDN) domain.
Answer: A,D
Explanation:
B: There are two ways to map your custom domain to a CDN endpoint.
1 . Create a CNAME record with your domain registrar and map your custom domain and subdomain to the CDN endpoint
2 . Add an intermediate registration step with Azure cdnverify
C: The Azure Content Delivery Network (CDN) offers developers a global solution for delivering high-bandwidth content by caching blobs and static content of compute instances at physical nodes in the United States, Europe, Asia, Australia and South America.
The benefits of using CDN to cache Azure data include:
/ Better performance and user experience for end users who are far from a content source, and are using applications where many 'internet trips' are required to load content
/ Large distributed scale to better handle instantaneous high load, say, at the start of an event such as a product launch References: https://azure.microsoft.com/en-gb/documentation/articles/cdn-how-to-use/
https://github.com/Azure/azure-content/blob/master/articles/cdn-map-content-to-custom- domain.md
https://github.com/Azure/azure-content/blob/master/articles/cdn-map-content-to-custom- domain.md