MCQOPTIONS
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MCQOPTIONS
This section includes 51 Mcqs, each offering curated multiple-choice questions to sharpen your Apache Hadoop knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Internal authentication stores usernames and bcrypt-hashed passwords in the ____________ table. |
| A. | system_auth.creds |
| B. | system_auth.credentials |
| C. | system.credentials |
| D. | sys_auth.credentials |
| Answer» C. system.credentials | |
| 2. |
Cassandra creates a ___________ for each table, which allows you to symlink a table to a chosen physical drive or data volume. |
| A. | directory |
| B. | subdirectory |
| C. | domain |
| D. | path |
| Answer» C. domain | |
| 3. |
When ___________ contents exceed a configurable threshold, the memtable data, which includes indexes, is put in a queue to be flushed to disk |
| A. | subtable |
| B. | memtable |
| C. | intable |
| D. | memorytable |
| Answer» C. intable | |
| 4. |
Data in the commit log is purged after its corresponding data in the memtable is flushed to an _________ . |
| A. | SSHables |
| B. | SSTable |
| C. | Memtables |
| D. | None of the mentioned |
| Answer» C. Memtables | |
| 5. |
A _________ grants initial permissions, and subsequently a user may or may not be given the permission to grant/revoke permissions. |
| A. | keyspace |
| B. | superuser |
| C. | sudouser |
| D. | none of the mentioned |
| Answer» C. sudouser | |
| 6. |
__________ is one of many possible IAuthorizer implementations, and the one that stores permissions in the system_auth.permissions table to support all authorization-related CQL statements. |
| A. | CassandraAuth |
| B. | CassandraAuthorizer |
| C. | CassAuthorizer |
| D. | All of the mentioned |
| Answer» C. CassAuthorizer | |
| 7. |
For each SSTable, Cassandra creates _________ index . |
| A. | memory |
| B. | partition |
| C. | in memory |
| D. | all of the mentioned |
| Answer» C. in memory | |
| 8. |
Zookeeper essentially mirrors the _______ functionality exposed in the Linux kernel. |
| A. | iread |
| B. | inotify |
| C. | iwrite |
| D. | icount |
| Answer» C. iwrite | |
| 9. |
ZooKeeper is used for configuration, leader election in Cloud edition of : |
| A. | Solr |
| B. | Solur |
| C. | Solar101 |
| D. | All of the mentioned |
| Answer» B. Solur | |
| 10. |
_________ serves distributed Lucene indexes in a grid environment. |
| A. | Katta |
| B. | Helprace |
| C. | Neo4j |
| D. | 101tec |
| Answer» B. Helprace | |
| 11. |
The Email & Apps team of ___________ uses ZooKeeper to coordinate sharding and responsibility changes in a distributed email client |
| A. | Katta |
| B. | Helprace |
| C. | Rackspace |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 12. |
You need to have _________ installed before running ZooKeeper. |
| A. | Java |
| B. | C |
| C. | C++ |
| D. | SQLGUI |
| Answer» B. C | |
| 13. |
ZooKeeper allows distributed processes to coordinate with each other through registers, known as : |
| A. | znodes |
| B. | hnodes |
| C. | vnodes |
| D. | rnodes |
| Answer» B. hnodes | |
| 14. |
The ZooKeeper Data Directory contains files which are _________ copy of the znodes stored by a particular serving ensemble. |
| A. | transient |
| B. | read only |
| C. | persistent |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 15. |
Helprace is using ZooKeeper on a _______ cluster in conjunction with Hadoop and HBase. |
| A. | 3-node |
| B. | 4-node |
| C. | 5-node |
| D. | 6-node |
| Answer» B. 4-node | |
| 16. |
A ___________ server is a machine that keeps a copy of the state of the entire system and persists this information in local log files. |
| A. | Master |
| B. | Region |
| C. | Zookeeper |
| D. | All of the mentioned |
| Answer» D. All of the mentioned | |
| 17. |
A number of constants used in the client ZooKeeper API were renamed in order to reduce ________ collision |
| A. | value |
| B. | namespace |
| C. | counter |
| D. | none of the mentioned |
| Answer» C. counter | |
| 18. |
The ________ master will register its own address in this znode at startup, making this znode the source of truth for identifying which server is the Master. |
| A. | active |
| B. | passive |
| C. | region |
| D. | all of the mentioned |
| Answer» B. passive | |
| 19. |
The ______ znode is used for synchronizing the changes made to the _acl_ table by the grant/revoke commands. |
| A. | zcl |
| B. | acl |
| C. | scl |
| D. | bnl |
| Answer» C. scl | |
| 20. |
___________ is used to decommission more than one RegionServer at a time by creating sub-znodes. |
| A. | /hbase/master |
| B. | /hbase/draining |
| C. | /hbase/passive |
| D. | None of the mentioned |
| Answer» C. /hbase/passive | |
| 21. |
How many types of special znodes are present in Zookeeper ? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | All of the mentioned |
| Answer» C. 3 | |
| 22. |
Zookeeper keep track of the cluster state such as the ______ table location. |
| A. | DOMAIN |
| B. | NODE |
| C. | ROOT |
| D. | All of the mentioned |
| Answer» D. All of the mentioned | |
| 23. |
_______ has a design policy of using ZooKeeper only for transient data |
| A. | Hive |
| B. | Imphala |
| C. | Hbase |
| D. | Oozie |
| Answer» D. Oozie | |
| 24. |
Sqoop has been tested with Oracle ______ Express Edition. |
| A. | 11.2.0 |
| B. | 10.2.0 |
| C. | 12.2.0 |
| D. | 10.3.0 |
| Answer» C. 12.2.0 | |
| 25. |
Sqoop is an open source tool written at ________ |
| A. | Cloudera |
| B. | IBM |
| C. | Microsoft |
| D. | All of the mentioned |
| Answer» D. All of the mentioned | |
| 26. |
Sqoop direct mode does not support imports of ______ columns |
| A. | BLOB |
| B. | LONGVARBINARY |
| C. | CLOB |
| D. | All of the mentioned |
| Answer» E. | |
| 27. |
The fields parsed by ____________ are backed by an internal buffer. |
| A. | LargeObjectLoader |
| B. | ProcessingException |
| C. | RecordParser |
| D. | None of the Mentioned |
| Answer» D. None of the Mentioned | |
| 28. |
Microsoft uses a Sqoop-based connector to help transfer data from _________ databases to Hadoop |
| A. | PostreSQL |
| B. | SQL Server |
| C. | Oracle |
| D. | MySQL |
| Answer» C. Oracle | |
| 29. |
__________ provides a Couchbase Server-Hadoop connector by means of Sqoop. |
| A. | MemCache |
| B. | Couchbase |
| C. | Hbase |
| D. | All of the mentioned |
| Answer» B. Couchbase | |
| 30. |
Which of the following interface is implemented by Sqoop for recording ? |
| A. | SqoopWrite |
| B. | SqoopRecord |
| C. | SqoopRead |
| D. | None of the mentioned |
| Answer» C. SqoopRead | |
| 31. |
Records are terminated by a __________ character. |
| A. | RECORD_DELIMITER |
| B. | FIELD_DELIMITER |
| C. | FIELD_LIMITER |
| D. | None of the mentioned |
| Answer» B. FIELD_DELIMITER | |
| 32. |
Sqoop uses _________ to fetch data from RDBMS and stores that on HDFS. |
| A. | Hive |
| B. | Map reduce |
| C. | Imphala |
| D. | BigTOP |
| Answer» C. Imphala | |
| 33. |
_________ allows users to specify the target location inside of Hadoop. |
| A. | Imphala |
| B. | Oozie |
| C. | Sqoop |
| D. | Hive |
| Answer» D. Hive | |
| 34. |
_________ tool can list all the available database schemas. |
| A. | sqoop-list-tables |
| B. | sqoop-list-databases |
| C. | sqoop-list-schema |
| D. | sqoop-list-columns |
| Answer» C. sqoop-list-schema | |
| 35. |
________ does not support the notion of enclosing characters that may include field delimiters in the enclosed string. |
| A. | Imphala |
| B. | Oozie |
| C. | Sqoop |
| D. | Hive |
| Answer» E. | |
| 36. |
Data can be imported in maximum ______ file formats. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | All of the mentioned |
| Answer» C. 3 | |
| 37. |
The __________ tool imports a set of tables from an RDBMS to HDFS. |
| A. | export-all-tables |
| B. | import-all-tables |
| C. | import-tables |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 38. |
Which of the following argument is not supported by import-all-tables tool ? |
| A. | –class-name |
| B. | –package-name |
| C. | –database-name |
| D. | –table-name |
| Answer» B. –package-name | |
| 39. |
Apache Cassandra™ is a massively scalable open source _______ database. |
| A. | SQL |
| B. | NoSQL |
| C. | NewSQL |
| D. | All of the mentioned |
| Answer» C. NewSQL | |
| 40. |
________ text is appropriate for most non-binary data types. |
| A. | Character |
| B. | Binary |
| C. | Delimited |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 41. |
If you set the inline LOB limit to ________ all large objects will be placed in external storage. |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» B. 1 | |
| 42. |
Cassandra marks data to be deleted using : |
| A. | tombstone |
| B. | combstone |
| C. | tenstone |
| D. | none of the mentioned |
| Answer» B. combstone | |
| 43. |
You configure sample frequency by changing the ________ property in the table definition. |
| A. | index_time |
| B. | index_interval |
| C. | index_secs |
| D. | none of the mentioned |
| Answer» C. index_secs | |
| 44. |
If the table has been configured with the __________ property, the coordinator node for the read request will retry the request with another replica node . |
| A. | rapid_retry |
| B. | speculative_retry |
| C. | speculative_rapid |
| D. | none of the mentioned |
| Answer» C. speculative_rapid | |
| 45. |
The compression offset map grows to ____ GB per terabyte compressed. |
| A. | 1-3 |
| B. | 10-16 |
| C. | 20-22 |
| D. | 0-1 |
| Answer» B. 10-16 | |
| 46. |
The type of __________ strategy Cassandra performs on your data is configurable and can significantly affect read performance. |
| A. | compression |
| B. | collection |
| C. | compaction |
| D. | decompression |
| Answer» D. decompression | |
| 47. |
Cassandra searches the __________ to determine the approximate location on disk of the index entry. |
| A. | partition record |
| B. | partition summary |
| C. | partition search |
| D. | all of the mentioned |
| Answer» C. partition search | |
| 48. |
There are _________ types of read requests that a coordinator can send to a replica |
| A. | two |
| B. | three |
| C. | four |
| D. | all of the mentioned |
| Answer» C. four | |
| 49. |
Tombstones exist for a configured time period defined by the _______ value set on the table. |
| A. | gc_grace_minutes |
| B. | gc_grace_time |
| C. | gc_grace_seconds |
| D. | gc_grace_hours |
| Answer» D. gc_grace_hours | |
| 50. |
_________ is a Cassandra feature that optimizes the cluster consistency process |
| A. | Hinted handon |
| B. | Hinted handoff |
| C. | Tombstone |
| D. | Hinted tomb |
| Answer» C. Tombstone | |