You have one primary HMaster and one standby. Your primary HMaster Falls fails and your client application needs to make a metadata change. Which of the following is the effect on your client application?
A. The client will queryZooKeepertofind the location of the new HMaster and complete the metadata change.
B. The client will make the metadata change regardless of the slate of the HMaster.
C. The new HMaster will notify the client and complete the metadata change.
D. Theclientapplication will fail with a runtime error.
Under default settings, which feature of HBase ensures that data won't be lost in the event of a RegionServer failure?
A. AllHBase activity is written to the WAL, which is stored in HDFS
B. All operations are logged on theHMaster.
C. HBase is ACID compliant, which guarantees that itis Durable.
D. Data is stored on the local filesystem of the RegionServer.
You have a table with the following rowkeys:
r1, r2, r3, r10, r15, r20, r25, r30, r35
In which order will these rows be retrieved from a scan?
A. r35,r30,r3,r25,r20,r2,r15,r10,r1
B. r1,r2,r3,r10,r15,r20, r25,r30,r35
C. r1,r10,r15,r2,r20,r25,r3,r30,r35
D. r35,r30,r25,r20,r15,r10,r3,r2,r1
Given that following is your entire dataset:
100 column=Managers:Name, timestamp=13313141762084, value=Steve 100 column=Manage:Salary, timestamp=13313141762086, value=80000 100 column=Skills:Skill_1, timestamp=13313141762089, value=Hadoop 100 column=Skills:Skill_2, timestamp=13313141762092, value=HBase How many sets of physical files will be read during a scan of the entire dataset immediately following a major compaction?
A. Two
B. One
C. Three
D. Four
You want to do a full table scan on your data. You decide to disable block caching to see if this improves scan performance. Will disabling block caching improve scan performance?
A. No. Disabling block caching does notimprove scan performance.
B. Yes.When you disable blockcaching, youfreeup that memory for other operations.Witha full table scan,you cannot take advantage of blockcaching anyway because your entiretable won'tfitinto cache.
C. No. If you disable block caching, HBase must read each block index from disk for each scan,thereby decreasing scan performance.
D. Yes. When you disable block caching, youfree up memory forMemStore, which improves,scanperformance.
Your client application needs to scan s region for the row key value 104.
Given a store that contains the following list of Row Key values:
100, 101, 102, 103, 104, 105, 106, 107
A bloom filter would return which of the following?
A. Confirmation that 104 may becontained in theset
B. Confirmation that 104 is contained in the set
C. Thehash of column family
D. The file offset of the value 104
Given the following dataset:
100 column=Managers:Name, timestamp=13313141762084, value=Steve 100 column=Manage:Salary, timestamp=13313141762086, value=80000 100 column=Skills:Skill_1, timestamp=13313141762089, value=Hadoop 100 column=Skills:Skill_2, timestamp=13313141762092, value=HBase How many store files will be contained in your region(s) immediately following a major compaction?
A. Four
B. Three
C. Two
D. One
Given the following HBase table schema:
Row Key, colFam_A:a, colFam_A:b, colFamB:2, colFam_B:10
A table scan will return the column data in which of the following sorted orders:
A. Row Key, colFam_A:a, colFam__A:b, colFam_B:10, colFam_B:2
B. Row Key, colFam_A:a, colFam__A:b,colFam_B:2, colFam_B:10
C. Row Key, colFam_A:a, colFam__B:2, colFam_A:b, colFam_B:10
D. Row Key, colFam_A:a, colFam__B:10, colFam_A:b, colFam_B:2
Your client application connects to HBase for the first time and queries the .META. table. What information does the .META. table provide to your client application?
A. The location of a Region
B. The location ofan MMaster
C. The location of aZooKeeper
D. The location of a璕OOT璽able
You have two tables in an existing RDBMS. One table contains order information (item, quantity, price, etc.) and the other contains store information (address, phone, manager, etc). These two tables are not often accessed simultaneously. You would like to move this data into HBase. How would you design the schema?
A. Create two tables each with a single columnfamily
B. Create a single table with one column family
C. Create a single table with two column families
D. Create two tables each with multiple column families
