Here list common operations, more refer to https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-Create%2FDrop%2FTruncateTable
Simple Table Creation
Create Table table_name (ID int, dtdontquery string, name string)
Create a partitioned table
Create Table table_name (ID int, dtdontquery string, name string) partitioned by (date string)
A table can have one or more partitions. Each partition exists in a
One, hive command line 1, hive support some of the commands
Command Description
quit Use quit or exit to leave the interactive shell.
Set Key=value Use the To set value of particular configuration variable. One thing to note here's if you misspell the variable name, the CLI won't show an error.
Set This would print a list of configuration variables that is overridden by user or
Hive in layman 's1. What is Hive1) What is hive?Here is an introduction to the Hive wiki:Hive is a data warehouse infrastructure built on top of Hadoop. IT provides tools to enable easy data ETL, a mechanism to put structures on the data, and the capability to querying and a Nalysis of large data sets stored in Hadoop files.
Hive Command Line interface
The command-line interface, the CLI, is the most common way to interact with hive. Using the CLI, users can create tables, check patterns, query tables, and so on. CLI Options
The following command shows a list of options provided by the CLI:
[Hadoop@localhost hive]$ hive--help--service CLI
first, control the number of maps in the Hive task:1. Typically, the job produces one or more map tasks through the directory of input.The main determinants are: The total number of input files, the file size of input, the size of the file block set by the cluster (currently 128M, can be set dfs.block.size in hive; command to see, this parameter can not be customized modification);2. For example:A) Assuming
Overview
As long as the correct file types and compression types (such as Textfile+gzip, sequencefile+snappy, etc.) are configured, hive can read and parse data as expected and provide SQL functionality.
The structure of the sequencefile itself has been designed to compress content. So for the Sequencefile file compression, not the Sequencefile file, and then the file compression. Instead, the Content field is compressed when the Sequencefile file is
Conversion from http://blog.csdn.net/suine/article/details/5653137
1. Hive Introduction
Hive is an open-source hadoop-based data warehouse tool used to store and process massive structured data. It stores massive data in the hadoop file system instead of the database, but provides a data storage and processing mechanism for database-like databases, and uses hql (SQL-like) the language automatically manages
DML mainly operates on the data in the Hive table, but because of the characteristics of Hadoop, the performance of a single modification and deletion is very low, so it does not support the level operation;Mainly describes the most common methods of BULK INSERT data:1. Loading data from a fileSyntax: LOAD [LOCAL] ' filepath ' [OVERWRITE] into TABLE [PARTITION (Partcol1=val1, partcol2=val2 ...) ]Cases:Load ' /opt/data.txt ' into Table table1; --If t
Label:After the configuration of the Hive ODBC driver is successful, it becomes easier to access it through C #, which is divided into query and update operations, directly attached to the test code. The target platform for C # Engineering compilation needs to be noted in this process
Read-Write access code example: Public classhiveodbcclient {///
///
///
Public Statichiveodbcclient Current {Get{return Newhiveodbcclie
Hive Installation (hadoop2.6.0 hive 1.2.1)Website address: http://hive.apache.org/downloads.html
three different modesInline mode: Metadata is kept in the inline derby mode, allowing only one session to connect to local standalone mode: Install MySQL locally, bar metadata in MySQL remote mode: Meta data placed in remote MySQL database
1. Embedded mode:
(1), modify/home/lin/hadoop/apache-
usage of Hive Beeline
Reprint: http://www.teckstory.com/hadoop-ecosystem/hive-new-cli-beeline-for-hive/
Hive is the Data Warehouse software of Hadoop ecosystem. It provides a mechanism to project structure onto large data sets stored in Hadoop. Hive allows to query this data
A container view controller is a way to combine the contents of multiple view controllers into a single user interface. The container view controller is often used to make navigation easier, creating a new user interface type based on what already exists. For example, the container view controller in Uikit includes Uinavigationcontroller,uitabbarcontroller and Ui
1. Typically, the job produces one or more map tasks through the directory of input.The main determinants are: The total number of input files, the file size of input, the size of the file block set by the cluster (currently 128M, can be set dfs.block.size in hive; command to see, this parameter can not be customized modification);2. For example:A) Assuming that the input directory has 1 file A and a size of 780M, then Hadoop separates the file a into
Hive is a framework that occupies and plays an important role in the ecosystem architecture of Hadoop, and it is used in many practical businesses, so that the popularity of Hadoop is largely due to the presence of hive. So what exactly is hive and why it occupies such an important position in the Hadoop family, this article will focus on Hive's architecture (arc
apache-hive-2.1.0 Installation
Installing Hive
Install the Namenode on Hadoop and copy the installation files to Linux/usr/hadoop/apache-hive-2.1.0-bin.tar.gz
Extract:
TAR–ZXVF apache-hive-2.1.0-bin.tar.gz
Add to environment variable
Vi/etc/profile
Edit
#hive
Export Hive_h
1. Hive IntroductionHive is an open-source hadoop-based data warehouse tool used to store and process massive structured data. It stores massive data in the hadoop file system instead of the database, but provides a data storage and processing mechanism for database-like databases, and uses HQL (SQL-like) the language automatically manages and processes the data. We can regard the volume of structured data in hive
Reference: http://www.cnblogs.com/xiaoxi/p/5695783.html1, directly the parameter of the form is written in the parameters of the controller corresponding method, applicable to the Get method submission, not for post mode submission. /** * 1. Write the parameters of the form directly in the parameter of the controller corresponding method * @param username * @param password * @return *
Compared with many tutorials, Hive has introduced concepts first. I like to install them first, and then use examples to introduce concepts. Install Hive first. Check whether the corresponding yum source has been installed. If the yum source blog. csdn. netnsrainbowarticledetails42429339hive is not installed according to the yum source file written in this tutorial
Compared with many tutorials,
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