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

Question : MemStore can...

1. Holds in-memory modifications to the Store
2. Flush writes to disk and clears the MemStore
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4. Both 1 and 3 are wrong

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Question : Which is the actual data storage


1. Region Store
2. MemStore
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4. .dat file

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StoreFile (HFile) is the file which store Actual data storage





Question : Store corresponds to a column family for a table for a given region


1. true
2. false

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Related Questions

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Question :

Your client application connects to HBase for the first time to perform a write. Which of the following
sequences will it traverse to find the region serving the row range of interest?

1. ZooKeeper -> RegionServer -> Region
2. ZooKeeper ->.META. -> RegionServer -> Region
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4. ZooKeeper -> HMaster -> -ROOT- -> .META. -> RegionServer -> Region




Question : You have a "Users" table in HBase and you would like to insert a row that consists of a UserID, "jsmith" and
an email address, "jane@example.com". The table has a single Column Family named "Meta" and the row key
will be the user's ID. The shell command you should use to complete this is:

1. put `Users', `jsmith70', `jane@example.com'
2. put `Users', `UserID:jsmith70', `Email:jane@example.com'
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4. put `Users', `Meta:UserID', `jsmith70', `Meta:Email, `jane@example.com'




Question :

You have images stored in HBase, which you need to retrieve from within your application. In which format will
your data be returned from an HBase scan?

1. Uninterpreted array of bytes
2. Java string literal
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4. Blob datatype





Question :

Your client application calls the following method for all puts to the single table notifications:
'put.setWriteToWAL, (false);
One region, region1, for the notifications table is assigned to RegionServer rs1. Which of the following
statements describes the result of RegionServer rs1 crashing?


1. All data in the notifications table is lost
2. No data is lost
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4. Data for your client application in the MemStores for region1 is lost




Question :

You have a key-value pair size of l00 bytes. You increase your HFile block size from its default 64k. What
results from this change?


1. scan throughput increases and random-access latency decreases
2. scan throughput decreases and random-access latency increases
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4. scan throughput increases and random-access latency increases





Question :

You have tin linage table live in production. The table users (timestamp) as the rowkey. You want to change
the existing rowkeys to (userid)(timestamp). Which of the following should you do?


1. Modify the client application to write to both the old table and a new table while migrating the old data separately
2. Use the ALTER table command to modify the rowkeys
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4. Add a new column to store the userid