CCA-500 Free Practice Test

Your cluster is running MapReduce version 2 (MRv2) on YARN. Your ResourceManager is configured to use the FairScheduler. Now you want to configure your scheduler such that a new user on the cluster can submit jobs into their own queue application submission. Which configuration should you set?

1. A. You can specify new queue name when user submits a job and new queue can be created dynamically if the property yarn.scheduler.fair.allow-undecleared-pools = true
2. B. Yarn.scheduler.fair.user.fair-as-default-queue = false and yarn.scheduler.fair.allow- undecleared-pools = true
3. C. You can specify new queue name when user submits a job and new queue can be created dynamically if yarn .schedule.fair.user-as-default-queue = false
4. D. You can specify new queue name per application in allocations.xml file and have new jobs automatically assigned to the application queue

Correct Answer: A

Which YARN daemon or service negotiations map and reduce Containers from the Scheduler, tracking their status and monitoring progress?

1. A. NodeManager
2. B. ApplicationMaster
3. C. ApplicationManager
4. D. ResourceManager

Correct Answer: B
Reference:http://www.devx.com/opensource/intro-to-apache-mapreduce-2-yarn.html(See resource manager)

You have a cluster running with a FIFO scheduler enabled. You submit a large job A to the cluster, which you expect to run for one hour. Then, you submit job B to the cluster, which you expect to run a couple of minutes only.
You submit both jobs with the same priority.
Which two best describes how FIFO Scheduler arbitrates the cluster resources for job and its tasks?(Choose two)

1. A. Because there is a more than a single job on the cluster, the FIFO Scheduler will enforce a limit on the percentage of resources allocated to a particular job at any given time
2. B. Tasks are scheduled on the order of their job submission
3. C. The order of execution of job may vary
4. D. Given job A and submitted in that order, all tasks from job A are guaranteed to finish before all tasks from job B
5. E. The FIFO Scheduler will give, on average, and equal share of the cluster resources over the job lifecycle
6. F. The FIFO Scheduler will pass an exception back to the client when Job B is submitted, since all slots on the cluster are use

Correct Answer: AD

Which is the default scheduler in YARN?

1. A. YARN doesn’t configure a default scheduler, you must first assign an appropriate scheduler class in yarn-site.xml
2. B. Capacity Scheduler
3. C. Fair Scheduler
4. D. FIFO Scheduler

Correct Answer: B
Reference:http://hadoop.apache.org/docs/r2.4.1/hadoop-yarn/hadoop-yarn-site/CapacityScheduler.html

Each node in your Hadoop cluster, running YARN, has 64GB memory and 24 cores. Your yarn.site.xml has the following configuration:

yarn.nodemanager.resource.memory-mb
32768


yarn.nodemanager.resource.cpu-vcores
12

You want YARN to launch no more than 16 containers per node. What should you do?

1. A. Modify yarn-site.xml with the following property:<name>yarn.scheduler.minimum-allocation-mb</name><value>2048</value>
2. B. Modify yarn-sites.xml with the following property:yarn.scheduler.minimum-allocation-mb4096
3. C. Modify yarn-site.xml with the following property:yarn.nodemanager.resource.cpu-vccores
4. D. No action is needed: YARN’s dynamic resource allocation automatically optimizes the node memory and cores

Correct Answer: A