Madanswer Technologies Interview Questions Data|Agile|DevOPs|Python - Recent questions and answers in Apache Phoenix

What are guideposts?

Mon, 01 Nov 2021 03:11:44 +0000

What are guideposts?

Answered: Can I map a Phoenix table over an existing HBase table?

Mon, 01 Nov 2021 03:11:30 +0000

Yes, as long as Phoenix data types are used. You have to use asynchronous indexes and manually update them since Phoenix won’t be aware of any updates.

Answered: Can I access a table created by Phoenix using the standard HBase API?

Mon, 01 Nov 2021 03:11:06 +0000

Yes, but is it is not recommended or supported. Data is encoded by Phoenix, so you have to decode the data for reading. Writing to the HBase tables directly would result in corruption in Phoenix.

Answered: Can I do bulk data loads in Phoenix?

Mon, 01 Nov 2021 03:10:43 +0000

Yes, you can do bulk inserts in Phoenix. For more information see https://phoenix.apache.org/bulk_dataload.html.

Answered: What happens to a Phoenix write when a RegionServer fails?

Mon, 01 Nov 2021 03:10:18 +0000

Writes are durable and durability is defined by a WRITE that is committed to disk (in the Write Ahead Log). So in case of a RegionServer failure, the write is recoverable by replaying the WAL. A “complete” write is one that has been flushed from the WAL to an HFile. Any failures will be represented as exceptions.

Answered: How do sequences work in Phoenix?

Mon, 01 Nov 2021 03:09:53 +0000

Sequences are a standard SQL feature that allows for generating monotonically increasing numbers typically used to form an ID.

Answered: What if the Phoenix index is being built asynchronously and data is added to a table during indexing?

Mon, 01 Nov 2021 03:09:26 +0000

Phoenix does local Indexing for deadlock prevention during global index maintenance.: Phoenix also atomically rebuild index partially when index update fails (PHOENIX-1112).

Answered: Can I see the individual cell timestamps in Phoenix tables? Is this something that's commonly used?

Mon, 01 Nov 2021 03:09:02 +0000

You can map HBase’s native row timestamp to a Phoenix column. By doing this, you can take advantage of the various optimizations that HBase provides for time ranges on the store files as well as various query optimization capabilities built within Phoenix.

Answered: Can I govern access to the Phoenix servers?

Mon, 01 Nov 2021 03:08:36 +0000

Yes, you can use Kerberos for authentication. You can configure authorization using HBase authorization.

Answered: Are there sizing guidelines for Phoenix JDBC servers?

Mon, 01 Nov 2021 03:08:12 +0000

For Phoenix applications, you must follow the same sizing guidelines that you follow for HBase. For more information about Phoenix performance tuning, https://phoenix.apache.org/tuning_guide.html.

Answered: What is the typical architecture for a Phoenix deployment?

Mon, 01 Nov 2021 03:07:47 +0000

A typical Phoenix deployment has the following:

Application

Phoenix Client/JDBC driver

HBase client

A Phoenix client/JDBC driver is essentially a Java library that you should include in your Java code. Phoenix uses HBase as storage similar to how HBase uses HDFS as storage. However, the abstraction for Phoenix is not yet complete, for example, for implementing access controls, you need to set ACLs on the underlying HBase tables that contain the Phoenix data.

Answered: Can Phoenix be used for ETL use cases?

Mon, 01 Nov 2021 03:07:04 +0000

Yes. Apache Phoenix is used for OLTP (Online Transactional Processing) use cases and not OLAP (Online Analytical Processing) use cases. Although, you can use Phoenix for real-time data ingest as a primary use case.

Answered: According to analysts, for what can traditional IT systems provide a foundation when they’re integrated with big data technologies like Hadoop?

Sun, 31 Oct 2021 03:18:40 +0000

a) Big data management and data mining. Data warehousing integrated with Hadoop would give a better understanding of data.

Answered: Point out the correct statement.

Sun, 31 Oct 2021 03:17:44 +0000

b) Hadoop 2.0 allows live stream processing of real-time data

Hadoop batch processes data distributed over a number of computers ranging in 100s and 1000s.

Answered: As companies move past the experimental phase with Hadoop, many cite the need for additional capabilities, including _______________

Sun, 31 Oct 2021 03:16:57 +0000

d) Improved security, workload management, and SQL support

Explanation: Adding security to Hadoop is challenging because all the interactions do not follow the classic client-server pattern.

Answered: A data lake stores a vast amount of data (like water in a natural lake).

Sun, 31 Oct 2021 03:14:28 +0000

Correct answer of the above question is : -b) True

To store and analyze the massive amount of data collected daily, big data infrastructures and platforms were created because the volume, velocity and variety of data collected requires fundamentally different infrastructure and fundamentally different platform breaking traditional systems.A data lake stores a vast amount of data (like water in a natural lake).

Answered: ______ allows multiple transactions to run independently of each another.

Sun, 31 Oct 2021 03:13:15 +0000

Correct answer of the above question is : -c) Isolation

Isolation allows multiple transactions to run independently of each another.

Answered: Transaction Managers are also called ___________.

Sun, 31 Oct 2021 03:12:29 +0000

Correct answer of the above question is : -a) Transaction Monitor

Transaction Managers are also called Transaction Monitor

Answered: ____________ assures all operations as a unit of work are performed at once

Sun, 31 Oct 2021 03:11:52 +0000

Correct answer of the above question is : -d) Atomicity

Atomicity assures all operations as a unit of work are performed at once

Answered: Transaction Manager manages and monitors transactions. It is also called Transaction Monitor.

Sun, 31 Oct 2021 03:11:10 +0000

Correct answer of the above question is : -a) True

Transaction Manager manages and monitors transactions. It is also called Transaction Monitor.

Answered: Apache Phoenix is developed by __________________.

Sun, 31 Oct 2021 03:10:31 +0000

Correct answer of the above question is : -c) Salesforce.com

Apache Phoenix is developed by Salesforce.com

Answered: ________ is a transactional engine for shared stores like HBase that enables enables multi versioning and rollback.

Sun, 31 Oct 2021 03:09:47 +0000

Correct answer of the above question is : -d) Apache Tephra

Apache Tephra is a transactional engine for shared stores like HBase that enables enables multi versioning and rollback.

Answered: The Apache Phoenix framework provides both server and client libraries.

Sun, 31 Oct 2021 03:08:36 +0000

Correct answer of the above question is : -b) True

The Apache Phoenix framework provides both server and client libraries.

Answered: Apache Phoenix supports array type only.

Sun, 31 Oct 2021 03:08:01 +0000

Correct answer of the above question is : -b) True

The Apache Phoenix 3.0/4.0 release introduces support for the JDBC ARRAY type. Any primitive type may be used in an ARRAY. Here is an example of declaring an array type when creating a table:

CREATE TABLE regions (
    region_name VARCHAR NOT NULL PRIMARY KEY,
    zips VARCHAR ARRAY[10]);

Answered: A transaction manager is easy and swift, keeps all necessary states in memory, and endures all states to a _________.

Sun, 31 Oct 2021 03:07:04 +0000

Correct answer of the above question is : -c) write-ahead log

A transaction manager is easy and swift, keeps all necessary states in memory, and endures all states to a write-ahead log

Answered: Which of the following is the HBase transaction manager?

Sun, 31 Oct 2021 03:06:24 +0000

Correct answer of the above question is : -b) Apache Tephra

Apache Tephra is the HBase transaction manager.Apache Tephra provides globally consistent transactions on top of distributed data stores such as Apache HBase. While HBase provides strong consistency with row- or region-level ACID operations,

Answered: Which of the following is an open source processing engine built for large scale processing of data?

Sun, 31 Oct 2021 03:04:36 +0000

Correct answer of the above question is : -c) Apache Spark

Apache Spark is an open source processing engine built for large scale processing of data

Answered: HBase enables transaction support by utilizing Apache Tephra as its transaction manager.

Sun, 31 Oct 2021 03:03:52 +0000

Correct answer of the above question is : -b) True

HBase enables transaction support by utilizing Apache Tephra as its transaction manager.Apache Phoenix added support for ACID transactions using Apache Tephra™ (incubating), an open source transaction engine on top of Apache HBase.

Answered: Transactions are an inevitable component of relational databases.

Sun, 31 Oct 2021 03:02:19 +0000

Correct answer of the above question is : -b) True

Transactions are an inevitable component of relational databases.Parallel execution in a database is inevitable. But, Parallel execution is permitted when there is an equivalence relation amongst the simultaneously executing transactions

Answered: PhoenixHiveHandler is used to read data from Phoenix in Hive.

Sun, 31 Oct 2021 03:01:13 +0000

Yes this is correct

PhoenixHiveHandler is used to read data from Phoenix in Hive.

Correct answer of the above question is : -a) True

Answered: Apache Tephra is a transactional engine for shared stores like HBase that gives assistance of multi versioning and rollback.

Sun, 31 Oct 2021 03:00:30 +0000

Correct answer of the above question is : -a) True

Answered: Which of the following statements about Hadoop are false?

Sat, 30 Oct 2021 12:57:38 +0000

All the above statements are true for Hadoop .hence Answer is

Correct answer of the above question is : -d) None of the above options

Answered: Salesforce.com developed Apache Phoenix.

Sat, 30 Oct 2021 12:56:46 +0000

Yes this is True

Correct answer of the above question is : -b) True

Salesforce.com developed Apache Phoenix.

Answered: Which of the following can run on top of Hadoop?

Sat, 30 Oct 2021 12:55:52 +0000

Correct answer of the above question is : -a) All the above options

Hbase, Hive and Phoenix can run on top of Hadoop

Answered: Data lake uses flat architecture to store data.

Sat, 30 Oct 2021 12:54:38 +0000

Correct answer of the above question is : -b) True

Data lake uses flat architecture to store data.A data lake has a flat architecture because the data can be unstructured, semi-structured, or structured, and collected from various sources across the organization, compared to a data warehouse that stores data in files or folders. You can have a data lake on-premises or in the cloud

Answered: What algorithm does MapReduce programming use?

Sat, 30 Oct 2021 12:53:27 +0000

Correct answer of the above question is : -c) All the above options

Reduce and Map algorithm does MapReduce programming use

Answered: Big data sources produce a large volume of data.

Sat, 30 Oct 2021 12:52:39 +0000

Correct answer of the above question is : -b) True

This is True, Big data sources produce a large volume of data.Big Data is a collection of data that is huge in volume, yet growing exponentially with time. It is a data with so large size and complexity that none of traditional data management tools can store it or process it efficiently. Big data is also a data but with huge size.

Answered: For HBase, what type of skin is Apache Phoenix?

Sat, 30 Oct 2021 12:51:27 +0000

Correct answer of the above question is : -c) SQL

For HBase, SQL type of skin is Apache Phoenix

Answered: In which of the following is Spark implemented?

Sat, 30 Oct 2021 12:50:27 +0000

Correct answer of the above question is : -a) Scala

Apache Spark is implemented in Scala

Answered: ___________ ensures that database modifications are not performed as an incomplete state transition in case of a failure.

Sat, 30 Oct 2021 12:48:27 +0000

Correct answer of the above question is : -b) Consistency

Consistency ensures that database modifications are not performed as an incomplete state transition in case of a failure.

Answered: Isolation allows multiple transactions to run independently of each another.

Sat, 30 Oct 2021 12:47:33 +0000

Correct answer of the above question is : -a) True

Transaction should be executed in isolation from other transactions (no Locks). During concurrent transaction execution, intermediate transaction results from simultaneously executed transactions should not be made available to each other.Isolation allows multiple transactions to run independently of each another.

Answered: A transaction primarily refers to modifications performed in a database in a logical line.

Sat, 30 Oct 2021 12:45:55 +0000

Correct answer of the above question is : -a) True

A Database Transaction is a logical unit of processing in a DBMS which entails one or more database access operation. In a nutshell, database transactions represent real-world events of any enterprise.A transaction primarily refers to modifications performed in a database in a logical line.