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NEW QUESTION: 1
CORRECT TEXT
Problem Scenario 71 :
Write down a Spark script using Python,
In which it read a file "Content.txt" (On hdfs) with following content.
After that split each row as (key, value), where key is first word in line and entire line as value.
Filter out the empty lines.
And save this key value in "problem86" as Sequence file(On hdfs)
Part 2 : Save as sequence file , where key as null and entire line as value. Read back the stored sequence files.
Content.txt
Hello this is ABCTECH.com
This is XYZTECH.com
Apache Spark Training
This is Spark Learning Session
Spark is faster than MapReduce
Answer:
Explanation:
See the explanation for Step by Step Solution and configuration.
Explanation:
Solution :
Step 1 :
# Import SparkContext and SparkConf
from pyspark import SparkContext, SparkConf
Step 2:
#load data from hdfs
contentRDD = sc.textFile(MContent.txt")
Step 3:
#filter out non-empty lines
nonemptyjines = contentRDD.filter(lambda x: len(x) > 0)
Step 4:
#Split line based on space (Remember : It is mandatory to convert is in tuple} words = nonempty_lines.map(lambda x: tuple(x.split('', 1))) words.saveAsSequenceFile("problem86")
Step 5: Check contents in directory problem86 hdfs dfs -cat problem86/part*
Step 6 : Create key, value pair (where key is null)
nonempty_lines.map(lambda line: (None, Mne}).saveAsSequenceFile("problem86_1")
Step 7 : Reading back the sequence file data using spark. seqRDD =
sc.sequenceFile("problem86_1")
Step 8 : Print the content to validate the same.
for line in seqRDD.collect():
print(line)
NEW QUESTION: 2
データベースアクセスの負荷を軽減するのに役立つ、一般的なデータベースクエリ結果の保存に最適なサービスはどれですか？
A. AmazonEC2インスタンスストア
B. Amazon ElastiCache
C. Amazon Machine Learning
D. Amazon SQS
Answer: B
Explanation:
Explanation
Amazon ElastiCache for Redis is a great choice for implementing a highly available, distributed, and secure in-memory cache to decrease access latency, increase throughput, and ease the load off your relational or NoSQL databases and applications. ElastiCache can serve frequently requested items at sub-millisecond response times, and enables you to easily scale for higher loads without growing the costlier backend databases. Database query results caching, persistent session caching, and full-page caching are all popular examples of caching with ElastiCache for Redis.
NEW QUESTION: 3
Which two statements indicate that the customer needs an infrastructure that can efficiently accommodate organizational changes? (Choose two.)
A. Collaboration applications must be flexible to quickly adapt to changes in user demand.
B. The lifetime of any technology in our company is approximately two to three years
C. Future success of our company depends on operational agility.
D. We need technology to dictate and lead business processes.
E. Collaboration equipment must be deployed at several locations and data centers.
Answer: A,C
NEW QUESTION: 4
展示を参照してください。
表示されているBashスクリプトのアクションは何ですか？
A. スクリプトは、入力が入力されるまで待機します。ディレクトリが存在する場合、スクリプトは同じ名前のディレクトリがなくなるまでそこに移動し、新しいディレクトリを作成します。
B. 現在のフォルダー内のすべてのディレクトリ。スクリプトはディレクトリに移動し、新しいディレクトリを作成します。
C. ユニット入力が入力されるのを待つスクリプトは、入力されたディレクトリに移動し、同じ名前で新しいディレクトリを作成します。
D. スクリプトは「$ ndir」というディレクトリに移動し、「$ ndir」という新しいディレクトリを作成します
Answer: A
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