hive helper

viii. Query Statement select for hive In all database systems, the SELECT statement is the most used, but also the most complex piece, the query in hive Select support syntax is certainly more complex, this article only try to introduce. 8.1 Basic Query Syntax The Select base syntax in hive is basically consistent with the standard SQL syntax, which supports whe

Label: Style Color Io ar SP file on problem log Logs record the process of running the program and are a powerful tool for finding problems. There are two types of logs in hive: 1. the system log records the hive running status and error status. 2. The job log records the historical execution process of jobs in hive. Where are system logs stored? The storage

Http://web.cse.ohio-state.edu/hpcs/WWW/HTML/publications/papers/TR-14-2.pdf(Auxiliary reference: Https://cwiki.apache.org/confluence/display/Hive/Correlation+Optimizer) IntroductionPrimary deficiencies of hive: storage and query plan execution. Three main improvement points are proposed in this paper. New file Format ORC Query plan component Optimization (Association optimizer correlati

Getting Started with Hive (ii) metadata for hive architecture 0Hive Hive stores metadata in the database (Metastore), supports databases such as MySQL, Derby, and Oracle, and Hive defaults to the Derby database The metadata in hive includes the name of the table

Label:For Windows 32-bit and 64-bit systems that have multiple versions of Hive ODBC Connector, the version must be fully matched during installation (that is: 32-bit Connector can only be run on 32-bit systems, and 64-bit Connector can only be 64-bit system operation) Reference: http://doc.mapr.com/display/MapR/Hive+ODBC+Connector#HiveODBCConnector-HiveODBCConnectoronWindows Directory: Package

what is hive. Data warehousing: Storing, querying, and analyzing large-scale datasql language: Easy-to-use class SQL query languageO Programming Model: Allows developers to customize UDFs, Transform, Mapper, and Reducer to make it easier to do work that complex mapreduce cannot doo data format: process data in any data format on Hadoop, or use an optimized format to store data on Hadoop, rcfile,orcfile,parquestData Services: HiveServer2, multiple API

1. Hive's inner tableThe inner table of Hive is the normally created table, which is already mentioned in http://www.cnblogs.com/raphael5200/p/5208437.html;2, the appearance of hiveTo create a hive's appearance, you need to use the keyword External:CREATE EXTERNAL TABLE [IF not EXISTS] [db_name.] TABLE_NAME [(col_name data_type [COMMENT col_comment], ...)] [COMMENT Table_comment] [Partitioned by (Col_name data_type [COMMENT col_comment], ...)]

1. Download the source code on the hive's official website and upload it to the server2. Go to the directory to unzipTAR-ZXVF apache-hive-0.14.0-src.tar.gz3. Go to the web directoryCD APACHE-HIVE-0.14.0-SRCCD Hwi/web4. Make the Web source into a zip packageZip hive-hwi-0.14.0.zip./*//packaged into a. zip file.5. Change the zip suffix to warHive-hwi-0.14.0.war6. C

"Programming Hive" Reading notes (two) Hive basics: first read is browse. Build knowledge index, because some knowledge may not be able to use, know is good. The parts of interest can be studied more. After the use of the time to look specifically. and combined with other materials.Chapter 3.Data Types and File FormatsRaw data types and collection data typesSelect out of data, the delimiter between columns

Part I: Building a hive JDBC development environmentBuild:Steps ? New project Hivetest? Import hive-dependent packages? Hive Command line start thrift service? Hive--service Hiveserver Part Two: Introduction of basic Operation ObjectsConnectionDescription: The connection object connected to

1. Create the lib121 directory under the hive0.13.1 version Cd/opt/cloudera/parcels/cdh/lib/hive;mkdir lib1212. Download the hive1.2.1 version and copy all files from this version of Lib to lib121 3. Modify the Hive_lib variable in/opt/cloudera/parcels/cdh/lib/hive/bin/hive hive_lib=${hive_home}/lib121 4. Update the JLine jar package on Hadoop and remove the ol

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

The hive Custom function consists of three UDFs, UDAF, UDTFUDF (User-defined-function) one in and outUDAF (user-defined Aggregation funcation) aggregation function, the more in one out. Count/max/minUDTF (user-defined table-generating Functions) One more step out, such as lateral view explore ()How to use: Add a custom function's jar file in a hive session, and then create a function to use itUdf1, the UDF

HIVE-UDF operationOperation procedure of UDF:Add A custom function to the jar file in the HIVE session , and then create the function, The function is then used. Below is an example of the following topics:Topic: Statistics of PV and UV for each activityFirst, Java through the regular expression, intercept the title name.Take a link to intercept the red string.http://cms.yhd.com/sale/vtxqclczfto? tc=ad.0.0.

Explain syntax Hive provides the explain command to display the query execution plan. Syntax: Explain [extended] Query The explain statement uses extended to provide additional information about the operation in the execution plan. This is a typical physical information, such as a file name. Hive queries are converted into sequences (this is a directed acyclic graph. These stages may be mapper/reduc

Hive has two data modification methods Load from file to hive table Hive does not perform any conversion when loading data to a table. The loading operation is a pure copy/move operation, which moves data files to the corresponding hive table. Syntax Load data [local] inpath 'filepath' [overwrite] into Table ta

Detailed description of how Mysql metadata generates Hive table creation statement annotation scripts, and metadata hive Preface This article describes how to generate a script for commenting on Hive table creation statements generated by Mysql metadata for your reference. I will not talk about it here. Let's take a look at the detailed introduction: Recently, wh

Label: First,Eclipse new Other-"map/reduce Project Project The project automatically contains the jar packages of the associated Hadoop, In addition, you will need to import the following hive and the MySQL-connected jar package separately: Hive/lib/*.jar Mysql-connector-java-5.1.24-bin.jar Second, the shipment hiveserver Command: bin/hive--service Hiveserver

1. Missing MySQL driver package 1.1 Problem Description caused by:org.datanucleus.store.rdbms.connectionpool.DatastoreDriverNotFoundException:The specified datastore Driver ("Com.mysql.jdbc.Driver") was wasn't found in the CLASSPATH. Please check your CLASSPATH specification, and the name of the driver. At Org.datanucleus.store.rdbms.connectionpool.AbstractConnectionPoolFactory.loadDriver ( abstractconnectionpoolfactory.java:58) at Org.datanucleus.store.rdbms.connectionpool.BoneCPConnectionP

Written in front one: In this paper, hive and hbase are integrated so that hive can read the data in HBase, so that the two most commonly used frameworks in the Hadoop ecosystem are combined to complement each other. Written in front two: Use software description To contract all software storage directory: /home/yujianxin First, hive integrated hbase pr