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.
Question:- What is REST?
Answer:- Rest stands for Representational State Transfer which defines the semantics so that the protocol can be used in a generic way to address remote resources. It also provides support for different message formats, offering many choices for a client application to communicate with the server.
Question:- Define Thrift?
Answer:- Apache Thrift is written in C++, but provides schema compilers for many programming languages, including Java, C++, Perl, PHP, Python, Ruby, and more.
Question:- What are the fundamental key structures of HBase?
Answer:- The fundamental key structures of HBase are row key and column key.
Question:- What is JMX?
Answer:- The Java Management Extensions technology is the standard for Java applications to export their status.
Question:- What is nagios?
Answer:- Nagios is a very commonly used support tool for gaining qualitative data regarding cluster status. It polls current metrics on a regular basis and compares them with given thresholds.
Question:- What is the syntax of describe Command?
Answer:- The syntax of describe command is – hbase> describe tablename