CCA-470 試験問題を無料オンラインアクセス

Your cluster is running Map v1 (MRv1), with default replication set to 3, and a cluster blocks 64MB. Identify which best describes the file read process when a Client application connects into the cluster and requests a 50MB file?

• A.The client queries the NameNode and then retrieves the block from the nearest DataNode to the client and then passes that block back to the client.
• B.The client queries the NameNode for the locations of the block, and reads from the first location in the list of receives.
• C.The client queries the NameNode for the locations of the block, and reads all three copies. The first copy to complete transfer to the client is the one the client reads as part of Hadoop's execution framework.
• D.The client queries the NameNode for the locations of the block, and reads from a random location in the list it receives to eliminate network I/O loads by balancing which nodes it retrieves data from at any given time.

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

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

What is the standard configuration of slave nodes in a Hadoop cluster?

• A.Each slave node runs a JobTracker and a DataNode daemon.
• B.Each slave node runs a TaskTracker, but only a fraction of the slave nodes run DataNode daemons.
• C.Each slave node runs a TaskTracker and a DataNode daemon.
• D.Each slave node runs a DataNode daemon, but only a fraction of the slave nodes run TaskTrackers.
• E.Each slave node either runs a TaskTracker or a DataNode daemon, but not both.

Assuming a large properly configured multi-rack Hadoop cluster, which scenario should not result in loss of HDFS data assuming the default replication factor settings?

• A.An entire rack fails.
• B.Multiple racks simultaneously fail.
• C.Ten percent of DataNodes simultaneously fail.
• D.All DataNodes simultaneously fail.
• E.Seventy percent of DataNodes simultaneously fail.

Identify the daemon that performs checkpoint operations of the namespace state in a cluster configured with HDFS High Availability (HA) using Quorum based-storage?

• A.JournalNode
• B.Standby NameNode
• C.CheckpointNode
• D.BackupNode
• E.NodeManeger
• F.Secondary NameNode
• G.NameNode