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

Question : Which is correct for the Data Storage concept in Hbase


1. Data is written to the Regions MemStore
2. When the MemStore gets to a certain size, it will flush to an immutable file (Store file)
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4. All of the above


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Question : In the minor compactation...


1. Combines some store files in a Single file
2. Runs after three store files have accumulated
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4. All 1,2 and 3 are correct
5. Only 1 and 2 are correct



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Minor Compaction
- Combines some Store files into a single file
- Runs after three Store files have accumulated
- Can be configured with hbase.hstore.compactionThreshold
- Larger number of compactions will take longer but will be fewer
- MemStore cannot flush to disk during compaction
- If MemStore runs out of memory, clients will hang or timeout





Question : Major compaction ......


1. Reads all the Store files and writes to a single Store
2. Deleted rows and expired versions are removed
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4. None of the 1,2 and 3 are correct
5. All 1,2 and 3 are correct

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Major Compaction
- Reads all the Store files and writes to a single Store
- Deleted rows and expired versions are removed
- Happens once daily
- Can be configured with hbase.hregion.majorcompaction
- Heavyweight operation - run when load is low

Related Questions

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Question : You have data already stored in HDFS and are considering using HBase. Which additional feature does HBase provide to HDFS ?




1. Random Writes
2. Batch Processing
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4. Scalablity




Question :


Your client application calls the following method for all puts to the single table notiifcations 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 :

Which of the following configuration values determines automated splitting ?




1. hbase.hregion.majorcompaction
2. hbase.hregion.flush.size
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4. hbase.hregion.max.filesize




Question :

Given the following HBase table schema
Row Key, colFam_A:a,colFam_A:b,colFam_B:2,colFam_B:10

A table scan will return the column data in which of the following sorted orders.





1. Row Key,colFam_A:a,colFam_A:b,colFam_B:10,colFam_B:2
2. Row Key,colFam_A:a,colFam_A:b,colFam_B:2,colFam_B:10
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4. Row Key,colFam_A:a,colFam_B:10,colFam_A:b,colFam_B:2




Question : You have a key-value pair size of bytes. You increase your HFile block size from its default k. What result 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 :

From within an HBase application, you would like to create a new table named weblogs. You have started with the following java code

HBaseAdmin admin = new HBaseAdmin(conf);
HTableDescriptor t = new HTableDescriptor("weblogs");

Which of the following method(s) would you use next ?




1. admin.createTable(t); admin.ebableTable(t);
2. admin.createTable(t);
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4. HTable.createTable(t);