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NEW QUESTION: 1
SkillWeave Industries are focused on managing the risk of selling their cars to the region due to economic turmoil, and have now begun using funds from sales in the region to fund supplier purchases from that region to reduce the risk from the volatile currency. However, SkillWeave want to go a step further and make the risk even less sizeable.
Which of the following is a method by which SkillWeave can operate in the market and transfer the risk of exchange rate exposure to another party?
A. Arrange a forward foreign exchange rate contract agreeing to buy a given amount of the foreign currency in 3 months time for a fixed exchange rate based on current rates
B. Put a sale on all vehicles stationed in the region to clear stock quickly
C. Invoice international sales in domestic currency
D. Temporarily stop operating in that target market
Answer: C
NEW QUESTION: 2
To process input key-value pairs, your mapper needs to lead a 512 MB data file in memory. What is the best way to accomplish this?
A. Place the data file in the DistributedCache and read the data into memory in the map method of the mapper.
B. Serialize the data file, insert in it the JobConf object, and read the data into memory in the configure method of the mapper.
C. Place the data file in the DistributedCache and read the data into memory in the configure method of the mapper.
D. Place the data file in the DataCache and read the data into memory in the configure method of the mapper.
Answer: A
Explanation:
Hadoop has a distributed cache mechanism to make available file locally that may be needed by Map/Reduce jobs
Use Case
Lets understand our Use Case a bit more in details so that we can follow-up the code snippets. We have a Key-Value file that we need to use in our Map jobs. For simplicity, lets say we need to replace all keywords that we encounter during parsing, with some other value.
So what we need is
A key-values files (Lets use a Properties files) The Mapper code that uses the code
Write the Mapper code that uses it
view sourceprint?
01.
public class DistributedCacheMapper extends Mapper<LongWritable, Text, Text, Text> {
02.
03.
Properties cache;
04.
05.
@Override
06.
protected void setup(Context context) throws IOException, InterruptedException {
07.
super.setup(context);
08.
Path[] localCacheFiles = DistributedCache.getLocalCacheFiles(context.getConfiguration());
09.
10.
if(localCacheFiles != null) {
11.
// expecting only single file here
12.
for (int i = 0; i < localCacheFiles.length; i++) {
13.
Path localCacheFile = localCacheFiles[i];
14.
cache = new Properties();
15.
cache.load(new FileReader(localCacheFile.toString()));
16.
}
17.
} else {
18.
// do your error handling here
19.
}
20.
21.
}
22.
23.
@Override
24.
public void map(LongWritable key, Text value, Context context) throws IOException,
InterruptedException {
25.
// use the cache here
26.
// if value contains some attribute, cache.get(<value>)
27.
// do some action or replace with something else
28.
}
29.
30.
}
Note:
* Distribute application-specific large, read-only files efficiently.
DistributedCache is a facility provided by the Map-Reduce framework to cache files (text, archives, jars etc.) needed by applications.
Applications specify the files, via urls (hdfs:// or http://) to be cached via the JobConf. The DistributedCache assumes that the files specified via hdfs:// urls are already present on the FileSystem at the path specified by the url.
Reference: Using Hadoop Distributed Cache
NEW QUESTION: 3
VMware Capacity Planner is an example of a(n) __________ discovery tool.
A. passive
B. active
Answer: A
Explanation:
There are two types of discovery methods: active and passive.
Active discovery methods can run processes that are detrimental and can impact a system. They
normallyrequire an agent.
With passive discovery methods, data is obtained in a non-impact, non-intrusive manner, with no
agents.
Obtaining and interpreting/presenting data such as this normally requires more experience.
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