Cloudera Hadoop Administrator Certification Certification Questions and Answer (Dumps and Practice Questions)

Question : Select the correct command/commands which can be used to Dump the container logs

1. yarn logs -applicationId ApplicationId
2. yarn logs -appOwner AppOwner
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4. yarn logs -nodeAddress NodeAddress


1. 1,2,3
2. 2,3,4
3. Access Mostly Uused Products by 50000+ Subscribers
4. 1,2,4
5. All 1,2,3,4

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Logs : Dump the container logs
Usage: yarn logs (options)
COMMAND_OPTIONS Description
-applicationId ApplicationId Specify an application id
-appOwner AppOwner Specify an application owner
-containerId ContainerId Specify a container id
-nodeAddress NodeAddress Specify a node address







Question : You have a cluster of Nodes in Geneva Datacenter , and you find a specific node in your cluster appears to be running
slower than other nodes with all having same hardware configuration. You think that RAM could be failure in the system.
Which commands may be used to the view the memory seen in the system?


1. free
2. df
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4. jps

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" lsram does not exist.
" jps lists the running Java processes, but does not provide any information on system memory usage.
" df provides information about free disk space, not RAM.
" top and free can be used to display memory and swap information. In both applications the memory in use includes read cache which will be released for application use before swapping begins.
" dmidecode shows bios information on a running system. The amount of installed RAM and size of the modules in each slot can be found in the output.


Additionally memory and swap usage can be viewed with cat /proc/meminfo or vmstat.






Question : You have a cluster of Nodes in Geneva Datacenter , and you find a specific node in your cluster appears to be running
slower than other nodes with all having same hardware configuration. You think that RAM could be failure in the system.
Which commands may be used to the view the memory seen in the system?
1. free 2. du 3. top 4. dmidecode 5. ramusage 6. ps -aef | grep java 7. memoryusage


1. 1,4,5
2. 1,2,4
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4. 1,4,6
5. 1,4,7


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Explanation: There is no command like ramusage. There is no command like memoryusage. " ps -aef | grep java will provide all the running Java processes, and how much memory configured for java process min and max. But does not show the currently used memory by this java process. du provides information about disk space used nothing about available memory and used memory. top and free can be used to display memory and swap information. In both applications the memory in use includes read cache which will be released for application use before swapping begins. Dmidecode reports information about your system's hardware as described in your system BIOS according to the SMBIOS/DMI standard (see a sample output). This information typically includes system manufacturer, model name, serial number, BIOS version, asset tag as well as a lot of other details of varying level of interest and reliability depending on the manufacturer. This will often include usage status for the CPU sockets, expansion slots (e.g. AGP, PCI, ISA) and memory module slots, and the list of I/O ports (e.g. serial, parallel, USB).
DMI data can be used to enable or disable specific portions of kernel code depending on the specific hardware. Thus, one use of dmidecode is for kernel developers to detect system "signatures" and add them to the kernel source code when needed.
dmidecode is a tool for dumping a computer's DMI (some say SMBIOS ) table contents in a human-readable format. This table contains a description of the system's hardware components, as well as other useful pieces of information such as serial numbers and BIOS revision. Thanks to this table, you can retrieve this information without having to probe for the actual hardware. While this is a good point in terms of report speed and safeness, this also makes the presented information possibly unreliable. The DMI table doesn't only describe what the system is currently made of, it also can report the possible evolutions (such as the fastest supported CPU or the maximal amount of memory supported). SMBIOS stands for System Management BIOS , while DMI stands for Desktop Management Interface. Both standards are tightly related and developed by the DMTF (Desktop Management Task Force). s you run it, dmidecode will try to locate the DMI table. If it succeeds, it will then parse this table and display a list of records like this one:

Handle 0x0002, DMI type 2, 8 bytes. Base Board Information Manufacturer: Intel
Product Name: C440GX+
Version: 727281-001
Serial Number: INCY92700942

Each record has:

A handle. This is a unique identifier, which allows records to reference each other. For example, processor records usually reference cache memory records using their handles.
A type. The SMBIOS specification defines different types of elements a computer can be made of. In this example, the type is 2, which means that the record contains "Base Board Information". dmidecode shows bios information on a running system. The amount of installed RAM and size of the modules in each slot can be found in the output.A size. Each record has a 4-byte header (2 for the handle, 1 for the type, 1 for the size), the rest is used by the record data. This value doesn't take text strings into account (these are placed at the end of the record), so the actual length of the record may be (and is often) greater than the displayed value.
Decoded values. The information presented of course depends on the type of record. Here, we learn about the board's manufacturer, model, version and serial number.
Beware that DMI data have proven to be too unreliable to be blindly trusted. Dmidecode does not scan your hardware, it only reports what the BIOS told it to.
Additionally memory and swap usage can be viewed with cat /proc/meminfo or vmstat.
top and free can be used to display memory and swap information. In both applications the memory in use includes read cache which will be released for application use before swapping begins.

Related Questions

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Question : Developer has submitted the YARN Job, by calling submitApplication() method on Resource Manager.
Please select the correct order of the below stpes after that

1. Container will be managed by Node Manager after job submission
2. Resource Manager triggers its sub-component Scheduler, which allocates containers for mapreduce job execution.
3. Resource Manager starts Application Master in the container


1. 2,3,1
2. 1,2,3
3. 2,1,3
4. 1,3,2


Question : Which of the following are responsbilities of the ApplicationMater

1. Before starting any task, create job's output directory for job's OutputCommitter.
2. Both map tasks and reduce tasks are created by Application Master.
3. If the submitted job is small, then Application Master runs the job in the same JVM on which Application Master is running.
4. If job doesn't qualify as Uber task, Application Master requests containers for all map tasks and reduce tasks.


1. 1,2,3
2. 2,3,4
3. 1,3,4
4. 1,2,4
5. 1,2,3,4





Question : Which of the following are the steps followed as part of TaskExecution

1. Once Containers assigned to tasks, Application Master starts containers by notifying its Node Manager.
2. Application Master copies Job resources (like job JAR file) from HDFS distributed cache and runs map or reduce tasks.
3. Node Manager copies Job resources (like job JAR file) from HDFS distributed cache and runs map or reduce tasks.
4. Running Tasks, keep reporting about the progress and status (Including counters) of current
task to Application Master and Application Master collects this progress information from all tasks and
aggregate values are propagated to Client Node or user.


1. 1,2,3
2. 2,3,4
3. 3,4,1
4. 1,3,4
5. 1,2,3,4





Question : You have to use YARN frmaeowrk for Hadoop Cluster, for that you have to configure "mapreduce.framework.name"
in mapred-site.xml, which is the correct value for this property


1. mrv2
2. yarn
3. v2
4. No need to configure cdh5 by default on yarn




Question : Which of the following properties in the yarn-site.xml file, will specifies the URIs of the directories
where the NodeManager stores container log files.



1. yarn.nodemanager.local-dirs
2. yarn.nodemanager.log-dirs
3. yarn.nodemanager.remote-app-log-dir
4. yarn.nodemanager.dirs




Question : . For YARN: conf/core-site.xml and conf/yarn-site.xml, respectively, have the IP addresses not the hostnames
of the NameNode, the ResourceManager, and the ResourceManager Scheduler


1. True
2. False