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NEW QUESTION: 1
HDInsightクラスターでSparkジョブとして実行されるデータ処理ソリューションを設計しています。このソリューションは、小売業者のオンライン注文に関するほぼリアルタイムの情報を提供するために使用されます。
ソリューションには、概要情報を表示する企業イントラネット上のページを含める必要があります。
概要情報ページは、次の要件を満たしている必要があります。
*これまでの売上の概要を、製品カテゴリ、価格帯、レビュー範囲別にグループ化して表示します。
*総売上、1日前の売上、1年前の売上などの売上概要情報を表示します。
*新しい注文の情報をできるだけ早く反映します。
ソリューションの設計を推奨する必要があります。
何を勧めますか？回答するには、回答領域で適切な構成を選択します。
Answer:
Explanation:
Explanation:
Box 1: DataFrame
DataFrames
Best choice in most situations.
Provides query optimization through Catalyst.
Whole-stage code generation.
Direct memory access.
Low garbage collection (GC) overhead.
Not as developer-friendly as DataSets, as there are no compile-time checks or domain object programming.
Box 2: parquet
The best format for performance is parquet with snappy compression, which is the default in Spark 2.x. Parquet stores data in columnar format, and is highly optimized in Spark.
Incorrect Answers:
DataSets
Good in complex ETL pipelines where the performance impact is acceptable.
Not good in aggregations where the performance impact can be considerable.
RDDs
You do not need to use RDDs, unless you need to build a new custom RDD.
No query optimization through Catalyst.
No whole-stage code generation.
High GC overhead.
References:
https://docs.microsoft.com/en-us/azure/hdinsight/spark/apache-spark-perf
NEW QUESTION: 2
If an antenna has a dBd of 8.6, what is the dBi value?
A. 6.2
B. 10.74
C. 6.46
D. 12.88
E. 8.6
Answer: B
Explanation:
Antenna performance
Antenna performance is measured in
dBi (the antennas gain/loss over a theoretical isotropic antenna)
dBd (the antennas gain/loss over a dipole antenna)
dBi = dBd + 2.15 dBd = dBi - 2.15
NEW QUESTION: 3
Which option lists the number of segments that are supported by VxLAN as standardized in RFC7348 and the number of bytes of overhead that are added to the original frame?
A. 16 million; 50
B. 1 million; 48
C. 16 million; 48
D. 1 million; 50
Answer: A
Explanation:
Reference: https://tools.ietf.org/html/rfc7348
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