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Apache Cassandra Online Test

Topics Covered

  • Tombstone expiration
  •  Bloom filter
  •  Starved stables
  •  Data caches
  •  Replication
  • the Consistency level
  •  Commitlog sync
  •  Snitch
  •  Selection clause
  •  Nodetool

Useful for hiring

  • Java Developer
  • Data Science Developer
  • Full stack Developer

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Question

While working in Cassandra one of the node is unreachable. You get a hint of missing data writes in the node. If you want to avoid the expiration of tombstone by repairing all the data within token range, which of the following repair methods will you use? 

Answer
    • Full repairs

    • Continued repairs

    • Incremental repairs

    • All of the mentioned

Question

While reading a path in Cassandra the data on disk is merged with data in RAM. You have used the bloom filter to determine whether the data from the two exists or not. What would be the value you set for bloom_filter_fp_chance, when you are using it for LeveledCompactionStrategy?

Answer
    • 0

    • 0.01

    • 0.1

    • 1

Question

While working with Cassandra, with peer-to-peer architecture every node in the cluster is eligible to receive read/write requests. Upon receiving the write request, columns would first be written on the commit log and then into the memtable onto the assigned node. Determine what alternatives will be adopted in case if the memory limit is exceeded for Cassandra inserts and updates?

Answer
    • The largest memtable will be flushed out on to disk

    • The smallest memtable will be flushed out on to disk

    • Last memtable will be flushed out on to disk

    • First memtable will be flushed out on to disk

Test details:

The online Apache Cassandra online test enables employers and recruiters to identify potential prospects by evaluating working skills and job readiness. For this reason, the emphasis is laid upon evaluating the knowledge of applied skills gained through real work experience, rather than theoretical knowledge.
 
The online Apache Cassandra test may contain MCQs (Multiple Choice Questions), MAQs (Multiple Answer Questions), Fill in the Blank, Descriptive, Whiteboard Questions, Audio / Video Questions, True or False.
 
Test Duration: 20 minutes

10 Application Questions

Test description:

Apache Cassandra is one of the highly scalable, high-performance distributed NoSQL database management systems which is designed to handle large amounts of data across many commodity servers, providing high availability with no single point of failure. Cassandra basically has a peer-to-peer distributed system across its nodes, and data is distributed among all the nodes in a cluster. 
 
Our Apache Cassandra online test is created & validated by experienced subject matter experts (SMEs) to assess database skills of candidates using Apache Cassandra as per industry standards. Online Apache Cassandra test helps recruiters and hiring managers to assess & hire developers with strong understanding of Cassandra database and java.
 
The Apache Cassandra assessment test helps to screen the candidates who possess traits as follows:
 

  • Should have experience in data modeling in Cassandra

  • Must have experience with all phases of Software Development Lifecycle, including system analysis, design, coding, testing, debugging and documentation.

  • Hands-on experience with Apache Cassandra and Java

  • Understanding of the Cassandra architecture concepts.

  • Proficient in Cassandra database, set up back-up/recovery processes, handle capacity planning, run maintenance tasks (e.g. upgrades).

 
Using powerful reporting of Apache Cassandra skills test, you can have a detailed analysis of the test results to help you make a better hiring decision and predict the candidate’s performance. To know about the candidate experience, we have introduced the new feature called candidate feedback module in our Apache Cassandra pre-employment test so that it will ensure you that the candidates are getting an excellent experience while attempting the test.

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