What is hive explain its architecture?
Architecture of Hive Hive is a data warehouse infrastructure software that can create interaction between user and HDFS. The user interfaces that Hive supports are Hive Web UI, Hive command line, and Hive HD Insight (In Windows server). Meta Store.
How would you describe hive?
There is nothing like SHOW VIEWS in Hive. DESCRIBE and DESCRIBE EXTENDED statements can be used for views like for tables, however, for DESCRIBE EXTENDED, the detailed table information has a variable named typeable which has value = ‘virtual view’ for views. EXTERNAL and LOCATION clause also works for views.
What are the different components of hive architecture?
The major components of Hive and its interaction with the Hadoop is demonstrated in the figure below and all the components are described further:
- User Interface (UI) –
- Hive Server – It is referred to as Apache Thrift Server.
- Driver –
- Compiler –
- Metastore –
- Execution Engine –
What is explain plan in hive?
EXPLAIN Syntax. Hive provides an EXPLAIN command that shows the execution plan for a query. The syntax for this statement is as follows: EXPLAIN [EXTENDED|CBO|AST|DEPENDENCY|AUTHORIZATION|LOCKS|VECTORIZATION|ANALYZE] query. AUTHORIZATION is supported from HIVE 0.14.
What are the functions in Hive?
Mathematical Functions in Hive
| Return type | Functions | Description |
|---|---|---|
| DOUBLE | exp(num) | It returns exponential of num. |
| DOUBLE | ln(num) | It returns the natural logarithm of num. |
| DOUBLE | log10(num) | It returns the base-10 logarithm of num. |
| DOUBLE | sqrt(num) | It returns the square root of num. |
What is Hive architecture explain its data types and file formats?
Hive supports four file formats those are TEXTFILE, SEQUENCEFILE, ORC and RCFILE (Record Columnar File). For single user metadata storage, Hive uses derby database and for multiple user Metadata or shared Metadata case Hive uses MYSQL.
What is bucketing in Hive with example?
Bucketing in hive is the concept of breaking data down into ranges, which are known as buckets, to give extra structure to the data so it may be used for more efficient queries. The range for a bucket is determined by the hash value of one or more columns in the dataset (or Hive metastore table).
What is Hive index?
Introduction to Indexes in Hive. Indexes are a pointer or reference to a record in a table as in relational databases. Indexing is a relatively new feature in Hive. In Hive, the index table is different than the main table. Indexes facilitate in making query execution or search operation faster.
What are the data types in Hive?
Data Types for Hive
| Data Type Definition Keyword | Hive Data Type | Description |
|---|---|---|
| INTEGER | INTEGER | A signed four-byte integer. |
| 1 | MAP< primitive-type, data-type> | An associative array of key-value pairs. |
| REAL | DOUBLE | A 64-bit double precision, floating-point number. |
| SMALLINT | SMALLINT | A signed two-byte integer, from -32,768 to 32,767. |
What is the query execution flow in Hive?
The flow goes like this : Step 1 : A Hive client triggers a query(CLI or some external client using JDBC, ODBC or Thrift or webUI). Step 2 : Compiler receives the query and connects to the metastore. Step 3: Start of the compilation phase.
What are the operators and functions in Hive?
Arithmetic Operators in Hive
| Operators | Description |
|---|---|
| A / B | This is used to divide A and B and returns the quotient of the operands. |
| A % B | This returns the remainder of A / B. |
| A | B | This is used to determine the bitwise OR of A and B. |
| A & B | This is used to determine the bitwise AND of A and B. |
What is hive in big data?
What is Hive. Hive is a data warehouse infrastructure tool to process structured data in Hadoop. It resides on top of Hadoop to summarize Big Data, and makes querying and analyzing easy. Initially Hive was developed by Facebook, later the Apache Software Foundation took it up and developed it further as an open source under the name Apache Hive.
What is Apache Hive architecture?
In short, we can summarize the Hive Architecture tutorial by saying that Apache Hive is an open-source data warehousing tool. The major components of Apache Hive are the Hive clients, Hive services, Processing framework and Resource Management, and the Distributed Storage.
What are the characteristics of hive?
Important characteristics of Hive. It reuses familiar concepts from the relational database world, such as tables, rows, columns and schema, etc. for ease of learning. Hadoop’s programming works on flat files. So, Hive can use directory structures to “partition” data to improve performance on certain queries.
What is the interface of hive?
Interface of the Hive such as Command Line or Web user interface delivers query to the driver to execute. In this, UI calls the execute interface to the driver such as ODBC or JDBC.