Hadoop interview questions part 48
Hadoop interview questions part 48
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Total Questions: 20
1. __________ maps input key/value pairs to a set of intermediate key/value pairs.
Correct Answer is : Mapper
2. The number of maps is usually driven by the total size of :
Correct Answer is : inputs
3. Running a ___________ program involves running mapping tasks on many or all of the nodes in our cluster.
Correct Answer is : MapReduce
4. Zookeeper essentially mirrors the _______ functionality exposed in the Linux kernel.
Correct Answer is : inotify
5. Point out the correct statement :
Correct Answer is : If we are to deploy Zookeeper in a distributed environment, we have to think about both the availability and scalability of the service
6. A ___________ server is a machine that keeps a copy of the state of the entire system and persists this information in local log files.
Correct Answer is : Zookeeper
7. ZooKeeper’s architecture supports high ____________ through redundant services.
Correct Answer is : availability
8. Point out the wrong statement :
Correct Answer is : None of the mentioned
9. _________ serves distributed Lucene indexes in a grid environment.
Correct Answer is : Katta
10. The Email & Apps team of ___________ uses ZooKeeper to coordinate sharding and responsibility changes in a distributed email client
Correct Answer is : Rackspace
11. ZooKeeper is used for configuration, leader election in Cloud edition of :
Correct Answer is : Solr
12. Helprace is using ZooKeeper on a _______ cluster in conjunction with Hadoop and HBase.
Correct Answer is : 3-node
13. The ZooKeeper Data Directory contains files which are _________ copy of the znodes stored by a particular serving ensemble.
Correct Answer is : persistent
14. You need to have _________ installed before running ZooKeeper.
Correct Answer is : Java
15. Point out the correct statement :
Correct Answer is : All znodes are ephemeral, which means they are describing a “temporary” state
16. How many types of special znodes are present in Zookeeper ?
Correct Answer is : 2
17. To register a “watch” on a znode data, you need to use the _______ commands to access the current content or metadata
Correct Answer is : stat
18. Point out the wrong statement :
Correct Answer is : All of the mentioned
19. _______ has a design policy of using ZooKeeper only for transient data
Correct Answer is : Hbase
20. Zookeeper keep track of the cluster state such as the ______ table location.
Correct Answer is : ROOT
