Question:- Define MapReduce.
Answer:- MapReduce as a process was designed to solve the problem of processing in excess of terabytes of data in a scalable way.
Question:- What are the operational commands of HBase?
Answer:- Operational commands of HBase are Get, Delete, Put, Increment, and Scan.
Question:- Which code is used to open the connection in Hbase?
Answer:- Following code is used to open a connection: Configuration myConf = HBaseConfiguration.create(); HTableInterface usersTable = new HTable(myConf, “users”);
Question:- Which command is used to show the version?
Answer:- Version command is used to show the version of HBase. Syntax – hbase> version
Question:- What is use of tools command?
Answer:- This command is used to list the HBase surgery tools.
Question:- What is the use of shutdown command?
Answer:- It is used to shut down the cluster.
Question:- What is the use of truncate command?
Answer:- It is used to disable, recreate and drop the specified tables.
Question:- Which command is used to run HBase Shell?
Answer:- $ ./bin/hbase shell command is used to run the HBase shell.
Question:- Which command is used to show the current HBase user?
Answer:- The whoami command is used to show HBase user.
Question:- How to delete the table with the shell?
Answer:- To delete table first disable it then delete it.
Question:- What is use of InputFormat in MapReducr process?
Answer:- InputFormat the input data, and then it returns a RecordReader instance that defines the classes of the key and value objects, and provides a next() method that is used to iterate over each input record.
Question:- What is the full form of MSLAB?
Answer:- MSLAB stands for Memstore-Local Allocation Buffer.
Question:- Define LZO?
Answer:- Lempel-Ziv-Oberhumer (LZO) is a lossless data compression algorithm that is focused on decompression speed, and written in ANSIC.
Question:- What is HBaseFsck?
Answer:- HBase comes with a tool called hbck which is implemented by the HBaseFsck class. It provides various command-line switches that influence its behavior.