Call Us Now!
+91 9884412301 | +91 9600112302
info@credosystemz.com
Credo SystemzCredo Systemz
  • Courses
    • TRENDING TECHNOLOGIES TRAINING
    • RPA TRAINING
    • CLOUD COMPUTING TRAINING
    • BIG DATA TRAINING
    • WEB DEVELOPMENT TRAINING
    • MOBILE APPLICATION TRAINING
    • SOFTWARE TESTING TRAINING
    • MICROSOFT TECHNOLOGIES TRAINING
    • JAVA TRAINING
    • PROJECT MANAGEMENT TRAINING
    • DATA WAREHOUSING TRAINING
    • ORACLE TRAINING
    • DATABASE DEVELOPER TRAINING
    • OTHER TRAININGS
    • TRENDING TECHNOLOGIES
      Python Training Data Science Training Angular Training React JS Training ORACLE PRIMAVERA TRAINING Machine Learning Training Hadoop Training Amazon Web Services Training DevOps Training Azure Training PySpark Training MEAN Stack Training
    • RPA TRAINING
      Blue Prism Training UiPath Training Automation Anywhere
    • CLOUD COMPUTING
      Amazon Web Services Training AWS with Devops Training Azure Training AZ 104 Azure Administrator AZ 204 Azure Developer AZ 300 Azure Architect AZ 303 Azure Architect AZ 400 Azure Devops Google Cloud Platform Salesforce Training OpenNebula Training OpenStack Training OpenSpan Training
    • BIG DATA TRAINING
      Hadoop Training Big Data Analytics Training Spark Training
    • WEB DEVELOPMENT
      Angular Training Node JS Training React JS Training React Native Training Ionic Framework Training MEAN Stack Training PHP Training JavaScript Training CoffeeScript Training Less JS Training Graphics Design Training HTML Training CSS Training
    • MOBILE APPLICATION
      Android Training iOS Training iOS Swift Training Kotlin Training Flutter Dart Training
    • SOFTWARE TESTING
      Manual Testing Training UFT / QTP Training Selenium Training API Testing Training Selenium with Python Training Perfecto Mobile Testing Training ETL Testing Training JMeter Training LoadRunner Training Performance Engineering Big Data Testing Training Protractor Testing Training
    • MICROSOFT TECHNOLOGIES
      Dot Net Training MVC Framework ASP.NET MVC with Angular SharePoint Training Advanced Excel Training Excel Macro Training Azure Training Azure Infrastructure Solutions AZ 300 Azure Architect
    • JAVA TRAINING
      Core Java Training Java 8 Training Java J2EE Training Advanced Java Training Hibernate Training Spring Training Struts Training
    • PROJECT MANAGEMENT
      Oracle Primavera Training Primavera P6 Online Training Microsoft Project Training PMP Training ITIL Training Prince2 Training Scrum Master Training Business Analytics Training
    • DATA WAREHOUSING
      Tableau Training Power BI Training Qlikview Training Qlik Sense Training Informatica Training Microstrategy Training Teradata Training Cognos Training SAS Training
    • ORACLE TRAINING
      Oracle PL/SQL Training Oracle DBA Training Oracle Apps Technical Training Oracle Apps SCM Training Oracle Apps HRMS Training Oracle Apps Finance Training Oracle RAC Training PeopleSoft HCM Training PeopleSoft Finance Training
    • DATABASE DEVELOPER
      MongoDB Training Apache Cassandra Training Sybase Training Informix Training Performance Tuning Training
    • OTHER TRAININGS
      Ethical Hacking Training C C++ Training Unix Shell Scripting Training Tensorflow Training Data Modeling Training Workday Training PEGA Training Digital Marketing Training CCNA Training Arduino Training Elm Training Go Programming Training Rust Programming Training CYBER SECURITY TRAINING BIZTALK SERVER TRAINING Spoken English Course
  • Fresher Courses
    • ANGULAR TRAINING
    • REACT TRAINING
    • PYTHON TRAINING
    • JAVA TRAINING
    • SELENIUM TRAINING
  • Placements
    • Career Guidance
      • Interview Questions
      • Resume Building
      • Job Opportunities
    • OVERALL PLACEMENTS
  • About Us
    • Online Training
    • Corporate Training
    • Events
    • Reviews
      • Video Reviews
    • Become an instructor
  • Training
    • Trending Technologies Training
    • RPA TRAINING in Chennai
    • Cloud Computing Training
    • Big Data Hadoop Training in Chennai
    • Web Development Training
    • Mobile Application Training
    • Software Testing Training
    • Microsoft Technologies Training
    • Java Training
    • Project Management Training
    • Data Warehousing Training
    • Oracle Training
    • Database Developer Training
    • Other Training
  • Blogs
    • GENERAL
      • TOP SKILL TO GET A JOB IN MNC
      • INTERVIEW TIPS FOR FRESHERS AND EXPERIENCE
      • TOP TRENDING TECHNOLOGIES
    • DATA SCIENCE
      • MACHINE LEARNING VS DATA SCIENCE
      • DATA SCIENCE INTERVIEW QUESTION AND ANSWER
    • PYTHON
      • WHY LEARN PYTHON
      • JAVA VS PYTHON
      • WHAT IS PYTHON
    • PRIMAVERA
      • LIFECYCLE OF PRIMAVERA
      • EPPM VS PPM
      • PROJECT MANAGEMENT STEPS
    • PMP
      • PMP CERTIFICATION
    • AWS
      • TOP 5 AWS SERVICES
      • AWS VS OPENSTACK
      • AMAZON VS AZURE VS GOOGLE CLOUD
      • WHY DEVELOPERS SHOULD LEARN AWS
    • ANGULAR
      • ANGULAR INTERVIEW QUESTIONS
      • ANGULAR VS REACT VS VUE
    • REACT
      • TOP REASON TO LEARN REACT
    • BLUE PRISM
      • BLUE PRISM VS UI PATH
      • WHAT IS RPA
    • UI PATH
      • RPA CERTIFICATION
    • CLOUD COMPUTING
      • BEST CLOUD COMPUTING SERVICES
    • DEVOPS
      • DEVOPS OVERVIEW
    • NODE JS
      • NODE JS CERTIFICATION
    • HADOOP
      • HADOOP CERTIFICATION
    • AZURE
      • AZURE CERTIFICATION
    • SOFTWARE TESTING
      • HOW TO BECOME A SOFTWARE TESTER
      • MOVE FROM MANUAL TO AUTOMATION TESTING
      • HOW MUCH IS JAVA REQUIRED FOR SELENIUM TESTING
  • Contact Us
  • Courses
    • TRENDING TECHNOLOGIES TRAINING
    • RPA TRAINING
    • CLOUD COMPUTING TRAINING
    • BIG DATA TRAINING
    • WEB DEVELOPMENT TRAINING
    • MOBILE APPLICATION TRAINING
    • SOFTWARE TESTING TRAINING
    • MICROSOFT TECHNOLOGIES TRAINING
    • JAVA TRAINING
    • PROJECT MANAGEMENT TRAINING
    • DATA WAREHOUSING TRAINING
    • ORACLE TRAINING
    • DATABASE DEVELOPER TRAINING
    • OTHER TRAININGS
    • TRENDING TECHNOLOGIES
      Python Training Data Science Training Angular Training React JS Training ORACLE PRIMAVERA TRAINING Machine Learning Training Hadoop Training Amazon Web Services Training DevOps Training Azure Training PySpark Training MEAN Stack Training
    • RPA TRAINING
      Blue Prism Training UiPath Training Automation Anywhere
    • CLOUD COMPUTING
      Amazon Web Services Training AWS with Devops Training Azure Training AZ 104 Azure Administrator AZ 204 Azure Developer AZ 300 Azure Architect AZ 303 Azure Architect AZ 400 Azure Devops Google Cloud Platform Salesforce Training OpenNebula Training OpenStack Training OpenSpan Training
    • BIG DATA TRAINING
      Hadoop Training Big Data Analytics Training Spark Training
    • WEB DEVELOPMENT
      Angular Training Node JS Training React JS Training React Native Training Ionic Framework Training MEAN Stack Training PHP Training JavaScript Training CoffeeScript Training Less JS Training Graphics Design Training HTML Training CSS Training
    • MOBILE APPLICATION
      Android Training iOS Training iOS Swift Training Kotlin Training Flutter Dart Training
    • SOFTWARE TESTING
      Manual Testing Training UFT / QTP Training Selenium Training API Testing Training Selenium with Python Training Perfecto Mobile Testing Training ETL Testing Training JMeter Training LoadRunner Training Performance Engineering Big Data Testing Training Protractor Testing Training
    • MICROSOFT TECHNOLOGIES
      Dot Net Training MVC Framework ASP.NET MVC with Angular SharePoint Training Advanced Excel Training Excel Macro Training Azure Training Azure Infrastructure Solutions AZ 300 Azure Architect
    • JAVA TRAINING
      Core Java Training Java 8 Training Java J2EE Training Advanced Java Training Hibernate Training Spring Training Struts Training
    • PROJECT MANAGEMENT
      Oracle Primavera Training Primavera P6 Online Training Microsoft Project Training PMP Training ITIL Training Prince2 Training Scrum Master Training Business Analytics Training
    • DATA WAREHOUSING
      Tableau Training Power BI Training Qlikview Training Qlik Sense Training Informatica Training Microstrategy Training Teradata Training Cognos Training SAS Training
    • ORACLE TRAINING
      Oracle PL/SQL Training Oracle DBA Training Oracle Apps Technical Training Oracle Apps SCM Training Oracle Apps HRMS Training Oracle Apps Finance Training Oracle RAC Training PeopleSoft HCM Training PeopleSoft Finance Training
    • DATABASE DEVELOPER
      MongoDB Training Apache Cassandra Training Sybase Training Informix Training Performance Tuning Training
    • OTHER TRAININGS
      Ethical Hacking Training C C++ Training Unix Shell Scripting Training Tensorflow Training Data Modeling Training Workday Training PEGA Training Digital Marketing Training CCNA Training Arduino Training Elm Training Go Programming Training Rust Programming Training CYBER SECURITY TRAINING BIZTALK SERVER TRAINING Spoken English Course
  • Fresher Courses
    • ANGULAR TRAINING
    • REACT TRAINING
    • PYTHON TRAINING
    • JAVA TRAINING
    • SELENIUM TRAINING
  • Placements
    • Career Guidance
      • Interview Questions
      • Resume Building
      • Job Opportunities
    • OVERALL PLACEMENTS
  • About Us
    • Online Training
    • Corporate Training
    • Events
    • Reviews
      • Video Reviews
    • Become an instructor
  • Training
    • Trending Technologies Training
    • RPA TRAINING in Chennai
    • Cloud Computing Training
    • Big Data Hadoop Training in Chennai
    • Web Development Training
    • Mobile Application Training
    • Software Testing Training
    • Microsoft Technologies Training
    • Java Training
    • Project Management Training
    • Data Warehousing Training
    • Oracle Training
    • Database Developer Training
    • Other Training
  • Blogs
    • GENERAL
      • TOP SKILL TO GET A JOB IN MNC
      • INTERVIEW TIPS FOR FRESHERS AND EXPERIENCE
      • TOP TRENDING TECHNOLOGIES
    • DATA SCIENCE
      • MACHINE LEARNING VS DATA SCIENCE
      • DATA SCIENCE INTERVIEW QUESTION AND ANSWER
    • PYTHON
      • WHY LEARN PYTHON
      • JAVA VS PYTHON
      • WHAT IS PYTHON
    • PRIMAVERA
      • LIFECYCLE OF PRIMAVERA
      • EPPM VS PPM
      • PROJECT MANAGEMENT STEPS
    • PMP
      • PMP CERTIFICATION
    • AWS
      • TOP 5 AWS SERVICES
      • AWS VS OPENSTACK
      • AMAZON VS AZURE VS GOOGLE CLOUD
      • WHY DEVELOPERS SHOULD LEARN AWS
    • ANGULAR
      • ANGULAR INTERVIEW QUESTIONS
      • ANGULAR VS REACT VS VUE
    • REACT
      • TOP REASON TO LEARN REACT
    • BLUE PRISM
      • BLUE PRISM VS UI PATH
      • WHAT IS RPA
    • UI PATH
      • RPA CERTIFICATION
    • CLOUD COMPUTING
      • BEST CLOUD COMPUTING SERVICES
    • DEVOPS
      • DEVOPS OVERVIEW
    • NODE JS
      • NODE JS CERTIFICATION
    • HADOOP
      • HADOOP CERTIFICATION
    • AZURE
      • AZURE CERTIFICATION
    • SOFTWARE TESTING
      • HOW TO BECOME A SOFTWARE TESTER
      • MOVE FROM MANUAL TO AUTOMATION TESTING
      • HOW MUCH IS JAVA REQUIRED FOR SELENIUM TESTING
  • Contact Us

PayPal Hadoop Interview Questions

  • Home
  • PayPal Hadoop Interview Questions

Paypal – Hadoop Interview Questions

Here is the list of Hadoop Interview Questions which are recently asked in Paypal company. These questions are included for both Freshers and Experienced professionals.


1. Configure slots in Hadoop 2.0 and Hadoop 1.0.

  • Each Map Reduce Jobs are split into task and Task tracker runs each task on a fixed number of map and reduce slots inside a data node based on a static configuration.
  • In Hadoop 1.0 we need to specify in mapred-site.xml the following parameter to Configure the number of map slots and reduce slots.
  • Hadoop 2 now supports Automatic Failover of the YARN ResourceManager. Because of many such enterprise ready features, Hadoop is making news and the positive predictions.

2. In case of high availability, if the connectivity between Standby and Active NameNode is lost. How will this impact the Hadoop cluster?

Active Name Node and standby Name Node is not directly connected. They are connected through a medium, journal. Read and write operation is through journal only. If the network is down then only connectivity between the NameNode and Standby Name Node will be lost. There is no impact on hadoop cluster till then your Name Node is Up and running.

3. What is the minimum number of ZooKeeper services required in Hadoop 2.0 and Hadoop 1.0?

Group of ZooKeeper servers. The minimum number of the nodes that is required to form an ensemble is 3.

4. If the hardware quality of few machines in a Hadoop Cluster is very low. How will it affect the performance of the job and the overall performance of the cluster?

Installing Hadoop cluster in production is just half the battle won. It is extremely important for a Hadoop admin to tune the Hadoop cluster setup to gain maximum performance. During the Hadoop installation, the cluster is configured with default configuration settings which are on par with the minimal hardware configuration. It is the extremely important for Hadoop admins to be familiar with various hardware specifications like – the number of disks mounted on datanodes, RAM capacity, the number of virtual and physical cores, the number of CPU cores, NIC Cards, etc.

5. How does a NameNode confirm that a particular node is dead?

Receipt of a Heartbeat implies that the DataNode is functioning properly. A Blockreport contains a list of all blocks on a DataNode. When NameNode notices that it has not recieved a hearbeat message from a data node after a certain amount of time, the data node is marked as dead.

6. Explain the difference between blacklist node and dead node.

When the JobTracker submits jobs to the TaskTracker and the tasks on that the node have failed too many times, the JobTracker will blacklisted a TaskTracker.Dead Node , which are not in the cluster or configure but not showing into the cluster.

7. How can you increase the NameNode heap memory?

  • Blocksize=128 MB, Replication=1.
  • Cluster capacity in MB: 200 * 24,000,000 MB = 4,800,000,000 MB (4800 TB).
  • Disk space needed per block: 128 MB per block * 1 = 128 MB storage per block.
  • Cluster capacity in blocks: 4,800,000,000 MB / 128 MB = 36,000,000 blocks.
Free PDF : Get our updated Hadoop Course Content pdf

8. Configure capacity scheduler in Hadoop.

  • Purpose.
  • Features.
  • Configuration. Setting up ResourceManager to use CapacityScheduler. Setting up queues.
  • Changing Queue Configuration. Changing queue configuration via file. Deleting queue via file.
  • Updating a Container .
  • Activities. Scheduler Activities.

9. After restarting the cluster, if the MapReduce jobs that were working earlier are failing now, what could have gone wrong while restarting?

The cluster could be in a safe mode after the restart of a namenode. The administrator needs to wait for the namenode to exit the safe mode before restarting the jobs again.

10. Explain the steps to add and remove a DataNode from the Hadoop cluster.

  • Decommission the DataNode role. When asked to select the role instance to decommission, select the DataNode role instance.
  • Stop the DataNode role.
  • Verify the integrity of the HDFS service.
  • After all errors are resolved, perform the following steps.

11. In a large busy Hadoop cluster-how can you identify a long running job?

  • Login to Ambari.
  • Click on YARN
  • Click on Quick Links.
  • Click on resource Manager UI.
  • By default you will see a list of all submitted jobs.
  • Click on "Jobs -> Running" from left hand side menu.
  • Then click on sort by StartTime.

12. When NameNode is down, what does the JobTracker do?

Client submits job to the Namenode. Namenode looks for the data requested by the client and gives the block information. JobTracker is responsible for the job to be completed and the allocation of resources to the job.

13. When configuring Hadoop manually, which property file should be modified to configure slots?

There could be a separate configuration file for configuring the properties of these and job ACLs are checked for authorizing view and the modification of jobs.

14. How will you add a new user to the cluster?

To create the HDFS home directory[ie. /user/] on edge node. You can still run jobs with the new user on cluster, even if you havent created his home directory in the linux.

15. What is the advantage of speculative execution? Under what situations, Speculative Execution might not be beneficial?

The main work of the speculative execution is to reduce the job execution time; however, the clustering efficiency is affected due to duplicate tasks. Since in speculative execution redundant tasks are being executed, thus this can be reduce overall throughput.

Get Answer for all the above questions and place in your dream company

Wants to Become an Expert
in Hadoop?

Know More

TOP MNC's HADOOP INTERVIEW QUESTIONS & ANSWERS

Here we listed all Hadoop Interview Questions and Answers which are asked in Top MNCs. Periodically we update this page with recently asked Questions, please do visit our page often and be updated in Hadoop .

Accenture
Cognizant
Adobe
Wipro
Standard Chartered
Barclays
Amazon
IBM
Cloudera
Infosys
Paypal
Capgemini
Robert Bosch
MindTree
Tech Mahindra
FIS

other top mnc Hadoop Interview Q&A

  • Accenture
  • Amazon
  • Capgemini
  • Cognizant
  • IBM
  • Robert Bosch
  • Adobe
  • Wipro
  • Cloudera
  • MindTree
  • Wipro
  • Infosys
  • Tech Mahindra
  • Standard  Chartered
  • Paypal
  • FIS
  •  
  • Barclays
  •  

INDIA LOCATIONS

New #30,Old #16A,
Rajalakshmi Nagar, Velachery,
Chennai - 600 042.
Mobile: +91 9884412301

Plot No.8, Vinayaga Avenue,
Rajiv Gandhi Salai, Okkiampettai(OMR),
Chennai – 600 097.
Mobile: +91 9600112302

Refund/Cancellation Policy

INTERNATIONAL LOCATIONS

USA
Houchin Drive, Franklin, TN -37064
Tennessee
Email: info@credosystemz.com
Web: www.credosystemz.com
Chat With Us

UAE
Sima Electronic Building,
LLH Opposite,
Electra Street – Abu Dhabi
Email: info@credosystemz.com
Web: www.credosystemz.com
Chat With Us

TRENDING COURSES

  • Python Training in Chennai
  • Data Science Training in Chennai
  • AWS Training in Chennai
  • Big Data Hadoop Training in Chennai
  • Machine Learning Training in Chennai
  • Selenium Training in Chennai
  • Angular Training in Chennai
  • Oracle Primavera P6 Online Training
  • Mean Stack Training in Chennai
  • DevOps Training in Chennai
  • Microsoft Azure Training in Chennai
  • GCP Training in Chennai

Copyright 2022 CREDO SYSTEMZ | All Rights Reserved.