CCA-410 試験問題を無料オンラインアクセス

Which three processes does HDFS High Availability (HA) enable on your cluster?

• A.Manually 'fail over' between NameNodes
• B.Write data to two clusters simultaneously
• C.Automatically 'fail over' between NameNodes if one goes down
• D.Configure unlimited hot standby NameNode.
• E.Shut one NameNode down for maintenance without halting the cluster

Which MapReduce daemon instantiates user code, and executes map and reduce tasks on a cluster running MapReduce v1 (MRv1)?

• A.ApplicationMaster
• B.NameNode
• C.TaskTracker
• D.ResourceManager
• E.DataNode
• F.JobTracker
• G.NodeManager

Once a client application validates its identity and is granted access to file in a cluster. What is the reminder of read path back to the client?

• A.The namenode gives the client the block ID's and a list of Datanodes on which those blocks are found. And the application reads the block directly from the datanodes
• B.The namenode maps the read request against the block locations in it's stored metadata the block id's are stored by their distance to the client and moved to the datanode closest to the client according to hadoop rac topology. The client application then reads the blocks from the single datanode
• C.the namenode maps the read request against the block locations in its stored metadata and reads those blocks from the datanodes. The client applications then read the block from the namenode

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

Which two updates occur when a client application opens a stream to begin a file write on a cluster running MapReduce v1 (MRv1)?

• A.The metadata in the RAM on the NameNode is flushed to disk.
• B.The metadata in RAM on the NameNode is updated.
• C.Once the write stream closes on the DataNode, the DataNode immediately initiates a black report to the NameNode.
• D.The metadata in RAM on the NameNode is flushed disk.
• E.The change is written to the edits file.
• F.The change is written to the NameNode disk.