Apache-Hadoop-Developer 試験問題を無料オンラインアクセス

In Hadoop 2.0, which one of the following statements is true about a standby NameNode?
The Standby NameNode:

• A.Processes all client requests and block reports from the appropriate DataNodes.
• B.Runs on the same machine and shares the memory of the active NameNode.
• C.Receives the same block reports as the active NameNode.
• D.Communicates directly with the active NameNode to maintain the state of the active NameNode.

Analyze each scenario below and indentify which best describes the behavior of the default partitioner?

• A.The default partitioner computes the hash of the value and takes the mod of that value with the number of reducers. The result determines the reducer assigned to process the key-value pair.
• B.The default partitioner computes the hash of the key and divides that valule modulo the number of reducers. The result determines the reducer assigned to process the key-value pair.
• C.The default partitioner computes the hash of the key. Hash values between specific ranges are associated with different buckets, and each bucket is assigned to a specific reducer.
• D.The default partitioner assigns key-values pairs to reduces based on an internal random number generator.
• E.The default partitioner implements a round-robin strategy, shuffling the key-value pairs to each reducer in turn. This ensures an event partition of the key space.

Can you use MapReduce to perform a relational join on two large tables sharing a key? Assume that the two tables are formatted as comma-separated files in HDFS.

• A.Yes.
• B.Yes, so long as both tables fit into memory.
• C.No, but it can be done with either Pig or Hive.
• D.Yes, but only if one of the tables fits into memory
• E.No, MapReduce cannot perform relational operations.

Which project gives you a distributed, Scalable, data store that allows you random, realtime read/write access to hundreds of terabytes of data?

• A.Hive
• B.Pig
• C.Oozie
• D.Hue
• E.Flume
• F.HBase
• G.Sqoop

Which two of the following are true about this trivial Pig program' (choose Two)

• A.Pig assumes the contents of myfile are comma delimited
• B.The contents of myfile appear on stdout
• C.ABC has a schema associated with it
• D.myfile is read from the user's home directory in HDFS