Cloudera Certified Specialist in Apache HBase: CCB-400

Your HBase cluster has hit a performance wall and doesn't seem to be getting faster as you add

RegionServers. Adding an additional HMaster will:

A. Have no effect on performance.

B. Improve the performance of region writes but decreasethe performance of metadata changes.

C. Improve the performance of metadata chancier, but decrease the performance of region writes.

D. Make theperformance problem even worse, as operations will have to be replicated to multiplemasters.

You have a table with 5 TB of data, 10 RegionServers, and a region size of 256MB. You want to continue with puts to widely disbursed row ids in your table. Which of the following will improve write performance?

A. Increase your buffer cachein theRegionServers

B. Increase the number of RegionServers to 15

C. Decrease your number of RegionServersto 5

D. Decreaseyour regionsize to 128MB

You need to insert a cell with a specific timestamp (version) 13353903160532. Which of the following is true?

A. The timestamp for the entire row must be updatedto13353903160532

B. ThePutclass allows setting a cell specific timestamp

C. ThePutclass allows setting a column family-specific timestamp

D. TheHTableclass allows you to temporarily roll back the newer versions of the cell