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Cloudera CCA-470 Exam Sample Questions

Questions & Answers for Hadoop MapReduce developers, How NameNode Handles data node failures?

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: 1

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

  1. Once the write stream closes on the DataNode, the DataNode immediately initiates a black report to the NameNode.
  2. The change is written to the NameNode disk.
  3. The metadata in the RAM on the NameNode is flushed to disk.
  4. The metadata in RAM on the NameNode is flushed disk.
  5. The metadata in RAM on the NameNode is updated.
  • The change is written to the edits file.

  • Answer: D, F

    Explanation:

    Note: Namenode stores modifications to the filesystem as a log appended to a native filesystem file (edits). When a Namenode starts up, it reads HDFS state from an image file (fsimage) and then applies edits from edits log file. It then writes new HDFS state to (fsimage) and starts normal operation with an empty edits file. Since namenode merges fsimage and edits files only during start up, edits file could get very large over time on a large cluster. Another side effect of larger edits file is that next restart of Namenade takes longer.

    The secondary namenode merges fsimage and edits log periodically and keeps edits log size with in a limit. It is usually run on a different machine than the primary Namenode since its memory requirements are on the same order as the primary namemode. The secondary namenode is started by bin/start-dfs.sh on the nodes specified in conf/masters file.

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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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    Questions & Answers for Hadoop MapReduce developers, How NameNode Handles data node failures?

    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