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(Big Data Hadoop Administrator) Flashcards

7 cards from real CDP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Which HDFS configuration parameter controls the minimum percentage of DataNodes that must successfully write a block before the client receives acknowledgment?

    Answer: dfs.replication.min

    dfs.replication.min sets the minimum number of replicas that must be written before the write is considered successful.

  2. In YARN, what is the role of the ApplicationMaster?

    Answer: Negotiating resources and tracking task status for a specific application

    The ApplicationMaster is a per-application process that negotiates resources from the ResourceManager and works with NodeManagers to execute tasks.

  3. Which command correctly increases the replication factor of an existing HDFS file to 5?

    Answer: hdfs dfs -setrep -w 5 /path/to/file

    The hdfs dfs -setrep command changes the replication factor; -w waits for the replication to complete.

  4. A Hadoop cluster has frequent 'GC overhead limit exceeded' errors on the NameNode. What is the most appropriate first corrective action?

    Answer: Increase heap memory allocated to the NameNode via HADOOP_NAMENODE_OPTS

    GC overhead errors on the NameNode indicate insufficient heap memory; increasing it via HADOOP_NAMENODE_OPTS is the direct fix.

  5. What does the 'safe mode' state in HDFS prevent?

    Answer: Any modifications to the file system namespace

    In safe mode the NameNode is read-only; it does not allow any modifications to the HDFS namespace.

  6. Which Hadoop component is responsible for storing job history and providing a REST API to query completed MapReduce jobs?

    Answer: JobHistoryServer

    The JobHistoryServer retains logs and metrics for completed MapReduce jobs and exposes them via a web UI and REST API.

  7. In a Kerberos-secured Hadoop cluster, what artifact does a service use to authenticate without a human entering a password?

    Answer: Keytab file

    A keytab file contains encrypted Kerberos principal credentials, allowing services to obtain Kerberos tickets automatically.

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(Big Data Hadoop Administrator) Flashcards — CDP Study Cards with Answers