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NEW QUESTION: 1
Given the interface:
Public interface Idgenerator {
int getNextId();
}
Which class implements IdGenerator in a thread-safe manner, so that no threads can get a duplicate id value current access?
A. Public class generator Implements IdGenerator {
Private AtomicInteger id = new AtomicInteger (0);
return id.incrementAndget();
}
}
B. Public class Generator Implements idGenerator {
private int id = 0;
return ++id;
}
}
C. Public class Generator Implements IdGenerator {
private int id = 0;
public int getnextId() {
synchronized (id) {
return + + id;
}
}
}
D. Public class Generator Implements IdGenerator {
private volatile int Id = 0;
return + + Id;
}
E. Public class Generator Implements IdGenerator {
private int id = 0;
public int getNextId() {
synchronized (new Generator()) {
return + + id;
}
}
}
Answer: E
Explanation:
Code that is safe to call by multiple threads simultanously is called thread safe. If a piece of code is thread safe, then it contains no race conditions. Race condition only occur when multiple threads update shared resources. Therefore it is important to know what resources Java threads share when executing.
In Java you can mark a method or a block of code as synchronized. Synchronized blocks can be used to avoid race conditions.

NEW QUESTION: 2
Table metadata in Hive is:
A. Stored as metadata on the NameNode.
B. Stored along with the data in HDFS.
C. Stored in ZooKeeper.
D. Stored in the Metastore.
Answer: D
Explanation:
Explanation/Reference:
By default, hive use an embedded Derby database to store metadata information. The metastore is the
"glue" between Hive and HDFS. It tells Hive where your data files live in HDFS, what type of data they contain, what tables they belong to, etc.
The Metastore is an application that runs on an RDBMS and uses an open source ORM layer called DataNucleus, to convert object representations into a relational schema and vice versa. They chose this approach as opposed to storing this information in hdfs as they need the Metastore to be very low latency.
The DataNucleus layer allows them to plugin many different RDBMS technologies.
Note:
* By default, Hive stores metadata in an embedded Apache Derby database, and other client/server databases like MySQL can optionally be used.
* features of Hive include:
Metadata storage in an RDBMS, significantly reducing the time to perform semantic checks during query execution.
Reference: Store Hive Metadata into RDBMS

NEW QUESTION: 3
services.yourcompany.comで利用可能なAPIバックエンドを構築しています。 APIはAPI GatewayとLambdaで実装されています。 curlを使ってAPIのテストに成功しました。会社のWebサイト、www.yourcompany.comのWebページからAPIを呼び出すためのJavaScriptを実装しました。ブラウザでそのページにアクセスすると、次のエラーが発生します。
「同じオリジンポリシーでリモートリソースの読み取りが許可されていません」
あなたの会社のウェブページがAPIを呼び出すことをどのように許可することができますか？
A. JavaScriptフロントエンドでCORSを有効にします
B. API GatewayでCORSを有効にします
C. API GatewayでCORSを無効にします
D. JavaScriptフロントエンドでCORSを無効にする
Answer: B