Mapr (HP) Hadoop Developer Certification Questions and Answers (Dumps and Practice Questions)

Question : Put statements in correct order

A. Applications Manager talks directly to the Node Managers on those nodes to launch the containers for tasks.
B. Applications Manager, on boot-up, registers with ResourceManager
C. Resource Manager allocates a container for Applications Manager on a node. Tells Node Manager in charge of that node to launch the Applications Manager container
D. Resource Manager allocates the containers on different nodes in the cluster.
E. A client program submits the application

1. A,B,C,D,E
2. E,C,B,D,A
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4. A,E,B,D,C
5. D,A,B,E,C

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Explanation: Job Execution sequence in YARN
Execution Sequence:
1. A client program submits the application
2. Resource Manager allocates a container for Applications Manager on a node. Tells Node Manager in charge of that node to launch the Applications Manager container
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4. Resource Manager allocates the containers on different nodes in the cluster.
5. Applications Manager talks directly to the Node Managers on those nodes to launch the containers for tasks.
6. Applications Manager monitors the progress of the tasks.
7. When all the application's tasks are done, Applica3ons Manager unregisters itself from Resource Manager.
8. Resource Manager claims back the previously allocated containers for the application.

Question : Select the correct steps in which Non-MapReduce jobs are submitted on YARN cluster
A. The Resource Manager starts the Application Master to allocate a container to the job.
B. User submits an app request by passing configuration to the Application Master and to the Resource Manager.
C. When the Application Master is done, it then unregisters from the Resource Manager.
D. Then the Application Master launches the container and monitors it.

1. D,B,A,C
2. D,A,B,C
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4. C,D,A,B
5. D,C,B,A

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Explanation: Client submits an application to the YARN Resource Manager, including the information required for the Container Launch Context.
Next the Applications Manager, which is in the Resource Manager, negotiates a container and bootstraps the Application Master instance for the application.
Then the Application Master registers with the Resource Manager and requests containers. After that the Application Master communicates with Node Managers
to launch the containers it has been granted. The Application Master manages application execution. During execution, the application provides progress
and status information to the Application Master. The client can monitor the application s status by querying the Resource Manager or by communicating
directly
with the Application Master. The Application Master reports completion of the application to the Resource Manager.

1. A client program submits the application
2. ResourceManager allocates a specified container to start the ApplicationMaster
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4. ApplicationMaster negotiates with ResourceManager for appropriate resource containers
5. On successful container allocations, ApplicationMaster contacts NodeManager to launch the container
6. Application code is executed within the container, and then ApplicationMaster is responded with the execution status
7. During execution, the client communicates directly with ApplicationMaster or ResourceManager to get status, progress updates etc.
8. Once the application is complete, ApplicationMaster unregisters with ResourceManager and shuts down, allowing its own container process

Question : Which of the following component is part of resource manager

1. Application Master

2. Application Manager'

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4. Container

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Explanation: The terms Application Master and Application Manager are often used interchangeably. In reality Application Master is the main
container requesting,
launching and monitoring application specific resources, whereas Application Manager is a component inside ResourceManager. More details about Application
Manager is given below.

The ApplicationsManager is responsible for maintaining a collection of submitted applications. After application submission, it first validates the
application s specifications and rejects any application that requests unsatisfiable resources for its ApplicationMaster (i.e., there is no node in the
cluster
that has enough resources to run the ApplicationMaster itself). It then ensures that no other application was already submitted with the same application ID "a
scenario that can be caused by an erroneous or a malicious client. Finally, it forwards the admitted application to the scheduler. This component is also
responsible for recording and managing finished applications for a while before they are completely evacuated from the ResourceManager s memory. When an
application finishes, it places an ApplicationSummary in the daemon s log file. Finally, the ApplicationsManager keeps a cache of completed applications long
after applications finish to support users requests for application data (via web UI or command line). The configuration property
yarn.resourcemanager.max-completed-applications controls the maximum number of such finished applications that the ResourceManager remembers at any point of
time. The cache is a first-in, first-out list, with the oldest applications being moved out to accommodate freshly finished applications.

Mapr (HP) Hadoop Developer Certification Questions and Answers (Dumps and Practice Questions)

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