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NEW QUESTION: 1
Which describes how a client reads a file from HDFS?
A. The client queries the NameNode for the block location(s). The NameNode returns the block location(s) to the client. The client reads the data directory off the DataNode(s).
B. The client contacts the NameNode for the block location(s). The NameNode contacts the DataNode that holds the requested data block. Data is transferred from the DataNode to the NameNode, and then from the NameNode to the client.
C. The client queries all DataNodes in parallel. The DataNode that contains the requested data responds directly to the client. The client reads the data directly off the DataNode.
D. The client contacts the NameNode for the block location(s). The NameNode then queries the DataNodes for block locations. The DataNodes respond to the NameNode, and the NameNode redirects the client to the DataNode that holds the requested data block(s). The client then reads the data directly off the DataNode.
Answer: A
Explanation:
8.2.4. HDFS ClientUser applications access the filesystem using the HDFS client, a library that exports the HDFS filesystem interface. Like most conventional filesystems, HDFS supports operations to read, write and delete files, and operations to create and delete directories. The user references files and directories by paths in the namespace. The user application does not need to know that filesystem metadata and storage are on different servers, or that blocks have multiple replicas. When an application reads a file, the HDFS client first asks the NameNode for the list of DataNodes that host replicas of the blocks of the file. The list is sorted by the network topology distance from the client. The client contacts a DataNode directly and requests the transfer of the desired block. When a client writes, it first asks the NameNode to choose DataNodes to host replicas of the first block of the file. The client organizes a pipeline from node-to-node and sends the data. When the first block is filled, the client requests new DataNodes to be chosen to host replicas of the next block. A new pipeline is organized, and the client sends the further bytes of the file. Choice of DataNodes for each block is likely to be different.
Reference:
http://www.aosabook.org/en/hdfs.html
NEW QUESTION: 2
There is a very serious outage at AWS. EC2 is not affected, but your EC2 instance deployment scripts stopped
working in the region with the outage. What might be the issue?
A. None of the other answers make sense. If EC2 is not affected, it must be some other issue.
B. The AWS Console is down, so your CLI commands do not work.
C. AWS turns off the DeployCode API call when there are major outages, to protect from system floods.
D. S3 is unavailable, so you can't create EBS volumes from a snapshot you use to deploy new volumes.
Answer: D
Explanation:
Explanation
The CBS Snapshots are stored in S3, so if you have an scripts which deploy CC2 Instances, the CBS volumes
need to be constructed from snapshots stored in S3.
You can back up the data on your Amazon CBS volumes to Amazon S3 by taking point-in-time snapshots.
Snapshots are incremental backups, which means that only
the blocks on the device that have changed after your most recent snapshot are saved. This minimizes the time
required to create the snapshot and saves on
storage costs by not duplicating data. When you delete a snapshot, only the data unique to that snapshot is
removed. Cach snapshot contains all of the information
needed to restore your data (from the moment when the snapshot was taken) to a new CBS volume.
For more information on CBS Snapshots, please visit the below URL:
* http://docs.aws.amazon.com/AWSCC2/latest/UserGuide/
CBSSnapshots.htm I
NEW QUESTION: 3
What can you analyse in detail when you transfer the cost componentsplit from product cost planning to costing-based CO-PA?
A. Cost of good sold
B. Sales revenues
C. Cost of goods manufactured
D. Variance categories
Answer: A