Which two are Features of Hadoop’s rack topology?
Which two are Features of Hadoop’s rack topology?
Which YARN daemon or service negotiates map and reduce Containers from the Scheduler, tracking their status an
Which YARN daemon or service negotiates map and reduce Containers from the Scheduler,
tracking their status and monitoring for progress?
How must you format the underlying filesystem of each DataNode?
You are configuring a cluster running HDFS, MapReduce version 2 (MRv2) on YARN running
Linux. How must you format the underlying filesystem of each DataNode?
Which describes the file read process when a client application connects into the cluster and requests a 50MB
Your cluster has the following characteristics:
A rack aware topology is configured and on
Replication is not set to 3
Cluster block size is set to 64 MB
Which describes the file read process when a client application connects into the cluster and
requests a 50MB file?
what would another use see when they look in the directory?
On a cluster running CDH 5.0 or above, you use the hadoop fs –put command to write a 300MB
file into a previously empty directory using an HDFS block of 64MB. Just after this command has
finished writing 200MB of this file, what would another use see when they look in the directory?
What is the maximum amount of virtual memory allocated for each map before YARN will kill its Container?
Your cluster’s mapped-site.xml includes the following parameters
<name>mapreduce.map.memory.mb</name>
<value>4096<value/>
<name>mapreduce.reduce.memory,mb</name>
<value>8192</value>
And your cluster’s yarn-site.xml includes the following parameters
<name>yarn.nodemanager/vmen-pmem-ratio</name>
<value>2.1</value>
What is the maximum amount of virtual memory allocated for each map before YARN will kill its
Container?
Which Linux commands help you to identify whether swapping is occurring?
You suspect that your NameNode is incorrectly configured, and is swapping memory to disk.
Which Linux commands help you to identify whether swapping is occurring?
What is the result when you execute: hadoop jar samplejar.jar MyClass on a client machine?
Your cluster is configured with HDFS and MapReduce version 2 (MRv2) on YARN. What is the
result when you execute: hadoop jar samplejar.jar MyClass on a client machine?
Which three basic configuration parameters must you set to migrate your cluster from MapReduce1 (MRv1) to MapR
Which three basic configuration parameters must you set to migrate your cluster from
MapReduce1 (MRv1) to MapReduce v2 (MRv2)?
how do you increase JVM heap property to 3GB to optimize performance?
You are running a Hadoop cluster with MapReduce version 2 (MRv2) on YARN. You consistently
see that MapReduce map tasks on your cluster are running slowly because of excessive garbage
collection of JVM, how do you increase JVM heap property to 3GB to optimize performance?