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Question: 3

What action occurs automatically on a cluster when a DataNode is marked as dead?

  1. The NameNode forces re-replication of all the blocks which were stored on the dead DataNode.
  2. 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.
  3. 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.
  4. 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.


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’

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Question: 5

Which three distcp features can you utilize on a Hadoop cluster?

  1. Use distcp to copy files only between two clusters or more. You cannot use distcp to copy data between directories inside the same cluster.
  2. Use distcp to copy HBase table files.
  3. Use distcp to copy physical blocks from the source to the target destination in your cluster.
  4. Use distcp to copy data between directories inside the same cluster.
  5. Use distcp to run an internal MapReduce job to copy files.


Answer: B, D, E

Explanation:

DistCp (distributed copy) is a tool used for large inter/intra-cluster copying. It uses Map/Reduce to effect its distribution, error handling and recovery, and reporting. It expands a list of files and directories into input to map tasks, each of which will copy a partition of the files specified in the source list. Its Map/Reduce pedigree has endowed it with some quirks in both its semantics and execution. 

Reference: Hadoop DistCp Guide

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Question: 2

For a MapReduce job, on a cluster running MapReduce v1 (MRv1), what’s the relationship between tasks and task templates?

  1. There are always at least as many task attempts as there are tasks.
  2. There are always at most as many tasks attempts as there are tasks.
  3. There are always exactly as many task attempts as there are tasks.
  4. The developer sets the number of task attempts on job submission.


Answer: C

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Question: 3

What action occurs automatically on a cluster when a DataNode is marked as dead?

  1. The NameNode forces re-replication of all the blocks which were stored on the dead DataNode.
  2. 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.
  3. 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.
  4. 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.


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’

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