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NEW QUESTION: 1
What action occurs automatically on a cluster when a DataNode is marked as dead?
A. The NameNode forces re-replication of all the blocks which were stored on the dead DataNode.
B. The NameNode informs the client which write the blocks that are no longer available; the client then re-writes the blocks to a different DataNode.
C. The replication factor of the files which had blocks stored on the dead DataNode is temporarily reduced, until the dead DataNode is recovered and returned to the cluster.
D. The next time a client submits job that requires blocks from the dead DataNode, the JobTracker receives no heart beats from the DataNode. The JobTracker tells the NameNode that the DataNode is dead, which triggers block re-replication on the cluster.
Answer: A
Explanation:
How NameNode Handles data node failures?
NameNode periodically receives a Heartbeat and a Blockreport from each of the DataNodes in the
cluster. Receipt of a Heartbeat implies that the DataNode is functioning properly. A Blockreport
contains a list of all blocks on a DataNode. When NameNode notices that it has not recieved a
hearbeat message from a data node after a certain amount of time, the data node is marked as
dead. Since blocks will be under replicated the system begins replicating the blocks that were
stored on the dead datanode. The NameNode Orchestrates the replication of data blocks from one
datanode to another. The replication data transfer happens directly between datanodes and the
data never passes through the namenode.
Note:If the Name Node stops receiving heartbeats from a Data Node it presumes it to be dead and
any data it had to be gone as well. Based on the block reports it had been receiving from the dead
node, the Name Node knows which copies of blocks died along with the node and can make the
decision to re-replicate those blocks to other Data Nodes. It will also consult the Rack Awareness
data in order to maintain the two copies in one rack, one copy in another rack replica rule when
deciding which Data Node should receive a new copy of the blocks.
Reference:24 Interview Questions & Answers for Hadoop MapReduce developers,How
NameNode Handles data node failures'
NEW QUESTION: 2
A multinational company has Internet gateways in multiple countries and an internal IP WAN. They are designing an IP addressing scheme.Which are the three most important issues that need to be considered? (Choose three.)
A. Which locations will provide redundant links to the Internet?
B. Is hierarchy needed within the IP addressing plan?
C. What types of IP addresses are required, private, public, or both?
D. How many locations are in the network and what is their size?
E. How will VLANs be deployed for the customer?
Answer: B,C,D
NEW QUESTION: 3
In network data cabling, what is currently the medium of choice for short cable runs?
A. Ethernet
B. Twisted pair
C. Copper
D. Arcnet
Answer: C