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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. Your running a hadoop cluster with a name node on the host mynamenode.
What are two ways you can determine available HDFS space in your cluster?

A) Connect to http://mynamenode:50070/and locate the dfs remaining value
B) Run hadoop fs -du / and locate the dfs remaining value
C) Run hadoop dfsadmin - report and locate the DFS remaming value
D) Run hadoop DFSAdmin -spaceQuota and subtract DFS used % from configured capacity

2. A client application opens a file write stream on your cluster. Which two metadata changes occur during a file write?

A) the change is written to the fsimage file
B) the namenode triggers a block report to update block locations in the edits file
C) the change is written to the secondary namenode
D) the metadata in Ram on the namenode is flushed to disk
E) The change is written to the namenode disk
F) The metadata in a Ram on the name node is updated
G) The change is written to the edits file

3. Your cluster Mapreduce V1 (MVR1). What determines where blocks are return into HDFS client application?

A) The client immediately to data nodes based on the clusters rack locality settings
B) The client queries the name node, which returns information on which data nodes to use. Then client writes to those data nodes.
C) The clients sends the data to the name node, which then writes those blocks to the data nodes
D) the client writes immediately to data nodes at random

4. Which command does Hadoop offer to discover missing or corrupt HDFS data?

A) Dskchk
B) Hadoop does not provide any tools to discover missing or corrupt data; there is no need because three replicas are kept for each data block.
C) The map-only checksum utility,
D) Du
E) Fsck

5. Identity four pieces of cluster information that are stored on disk on the NameNode?

A) Names of the files in HDFS.
B) A catalog of DataNodes and the blocks that are stored on them.
C) The directory structure of the files in HDFS.
D) An edit log of changes that have been made since the last snapshot compaction by the Secondary NameNode.
E) The status of the heartbeats of each DataNode.
F) File permissions of the files in HDFS.
G) An edit log of changes that have been made since the last snapshot of the NameNode.

Solutions: