Cloudera HBase Certification Questions and Answers (Dumps and Practice Questions)

Question : Select the correct statement for Block Cache



1. Block is normally 64K
2. Default is 20% of RegionServer Heap
3. Access Mostly Uused Products by 50000+ Subscribers
4. Only 1 and 3 are correct
5. All 1,2 and 3 arec correct

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For Block Cache
Blocks read from the storage files are cached internally in configurable caches
Each Store file has a block-level cache to avoid reading data from disk
Block is normally 64K Default is 20% of RegionServer Heap
MemStore is write cache, Block Cache is read cache
Similar to a buffer pool Lease-Recently Used (LRU) policy to evict blocks from cache






Question : The __________ is required for crash recovery if the MemStore is lost

1. HLog
2. Store
3. Access Mostly Uused Products by 50000+ Subscribers

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Data is written to the Regions MemStore
- The HLog is required for crash recovery if the MemStore is lost





Question : When the MemStore gets to a certain size, it will flush to an immutable file (Store file)


1. true
2. false


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Related Questions

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Question : You need to insert a cell with a specific timestamp (version) . Which of the following is true?


1. The timestamp for the entire row must be updated to 13353903160532
2. The Put class allows setting a cell specific timestamp
3. Access Mostly Uused Products by 50000+ Subscribers
4. The HTable class allows you to temporarily roll back the newer versions of the cell




Question : Select the correct statement

1. .META table holds the list of all user space region
2. Entries in .META tables are keyed by region name
3. Access Mostly Uused Products by 50000+ Subscribers
4. Region name is made up of first raw values of that region



1. 1,2,4
2. 1,2,3
3. Access Mostly Uused Products by 50000+ Subscribers
4. 1,2,3,4





Question : Region name is made up of



1. Table name
2. Region Start row
3. Access Mostly Uused Products by 50000+ Subscribers
4. MD5 hash of table name, start row and creation timestamp
5. ALL of the above




Question : Which one of the client interface to HBase you can use, so you will
have functionality needed to store and retrive data from HBase as well as delete obsolete values


1. HMasterInterface
2. HTable
3. Access Mostly Uused Products by 50000+ Subscribers
4. HTablePool




Question : Which is/are the statement correct..

A. All operations taht mutate data are gaurnteed to be atomic on a per-row-basis
B. A reading client will not be affected by another updating a particular row
C. Many client can update the same row at same time

1. A,C correct
2. A,B correct
3. Access Mostly Uused Products by 50000+ Subscribers
4. All A,B,C are correct





Question : Select the correct statement..

A. Create HTable instances only once, usually when your application start
B. Create a separate HTable instance for every thread you execute or use HTablePool
C. Updates are atomic on per row basis



1. Only A,B correct
2. Only B,C correct
3. Access Mostly Uused Products by 50000+ Subscribers
4. All A,B,C are correct