Cloudera CCA-410

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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. You have a cluster running 32 slave nodes and 3 master nodes running mapreduce V1 (MRv1). You execute the command:
$ hadoop fsck /
What four cluster conditions running this command will return to you?

A) Under-replicated blocks
B) Number of datanodes
C) Number of dead datanodes
D) Configure capacity of your cluster
E) The current state of the file system returned from scanning individual blocks on each datanode
F) the location for every block
G) the current state of the file system according to the namenode
H) Blocks replicated improperly or that don't satisfy your cluster enhancement policy (e. g. , too many blocks replicated on the same node)

2. You are running two Hadoop clusters(cluster1 and cluster2), they run identical versions of hadoop.
You want to copy the data inside /home/foo/cluster1 to cluster2 into the directory /home/bar/
What is the correct distcp syntax to copy one directory tree from one cluster to the other cluster?

A) $ Hadoop distCp cluster1:/home/foo cluster2:/home/bar/
B) $ hadoop distCp hdfs://cluster1/home/foo hdfs://cluster2/home/bar/
C) $ distCp hdfs://cluster1/home/foo hdfs://cluster2/home/bar/
D) $ distCp cluster1:/home/foo cluster2:/home/bar/

3. Using cloudera manager on CDH4 cluster running mapreduce V1(MRv1), you delete a tasktracker role instance from a host that also a runs a datanode role instance and a region server role instance.cloudera
Manager make changes to the cluster and prompts you to the accept the changes.
What other configuration option will cloudera manager automatically prompt you to change?

A) the option to immediately rebalance the cluster
B) the option to specify an alternate slave host to place the received data node role instance
C) The option to failover to the instance by namenode
D) The option to change java maximum heap sizes for the other role instances

4. Your cluster has nodes in seven racks, and you have provided a rack topology script. What is Hadoop's block placement policy, assuming a block replication factor of three?

A) Because there are seven racks the block is written to a node on each rack
B) All three of the block are written to nodes on the same rack
C) One copy of the block is written to a node in each of three racks
D) One copy of the block is written to a node in one rack; two copies are written to two nodes in a different rack

5. How many mappers required for a map reduce, job determine on a cluster running map reduce V1 (MRv1)?

A) The number of mappers is calculated by namenode based on the number of HDFS blocks in the files
B) The number mappers is equal to no of input splits calculated by client submitting
C) the developer specifies the number in the job configuration
D) the jobtracker chooses the number based on no of available nodes

Solutions: