orc module

The Columnstore engine has a higher compression ratio, fewer IO operations than a traditional database row storage engine, especially when there are many columns of data, but each time the query and calculation is done for only a few columns, the Columnstore engines are more cost-effective.Currently in the open source implementation, the most famous Columnstore engine is parquet and Orc, and they are the top projects of Apache, playing an important ro

BackgroundWith the advent of the Big Data era, more and more data flows to the Hadoop ecosystem, while the ability to get valuable data from terabytes and even petabytes of data is even more important for a product and company, and a number of open source data analysis engines emerge during the rapid development of the Hadoop ecosystem , such as Hive, Spark SQL, Impala, Presto and so on, but also produced a number of high-performance Columnstore format, such as Rcfile,

added to the path before use.2.2 CompilingEnter the directory to execute./tpcds-build.sh, which will download the source code from Tpc-ds, compile, initialize Metastore, and prepare for importing data to hive.2.3 Importing DataImport ORC data:./tpcds-setup.sh 100 The default file format is orc, so you don't need to specify a storage format.Import Parquet data: Format=parquet./tpcds-setup.sh 100 Specify a f

1. OverviewWhen storing business data, as the business grows, the data stored on the HDFS by the Hive table increases over time and is stored in HDFs in text format, which consumes a huge amount of resources. Well, we need to have a way to reduce the cost of capacity. In Hive, there is an ORC file format that can significantly reduce the cost of storage capacity. Today, I will share with you how to implement streaming data to the Hive

Java API Read hive orc file Reprint: http://lxw1234.com/archives/2015/08/462.htm Orc is a hive-specific file format that has a very high compression ratio and read efficiency, so it quickly replaces the previous rcfile and becomes a very common file format in hive. In a real business scenario, you might want to use the Java API, or MapReduce read and write orc f

Reprinted from Dong's Blog The Columnstore engine has a higher compression ratio and less IO operations than the traditional row storage engine (note: Columnstore is not all-powerful, many scenarios are still more efficient), especially in the number of data columns (column), but each action is only for a few columns of the story, The Columnstore engine is more cost effective. In the Internet Big Data application scenario, in most cases, the data volume is very large and the number of data field

Java write local orc file (Hive2 API) Hive2.0 later, a new API was used to read and write orc files (https://orc.apache.org).The code in this article generates the Orc file locally using a Java program, and then loads it into the hive table.The code is as follows: Package COM.LXW1234.HIVE.ORC; Import org.apache.hadoop.conf.Configuration; Import Org.apache.hado

Apache. Tomcat calls the Class reflection mechanism of Servlet principles, which is explained by the orc Class, There is a beast package com.swift.servlet;public class OrcDemo {private int hp;private int mp;private int atk;public int getHp() {return hp;}public void setHp(int hp) {this.hp = hp;}public int getMp() {return mp;}public void setMp(int mp) {this.mp = mp;}public int getAtk() {return atk;}public void setAtk(int atk) {this.atk = atk;}public Orc

In the actual use of the TESSERACT-ORC recognition Library, the first production of the identification database is likely to be less than ideal recognition rate, need to slowly add laterThis article shows how to combine multiple modified box files into a single recognition library.First, you need a picture sample. tif file, location file. box, as long as you have these two files in, you can merge the dictionarySuppose you already have the following sa

Orc, half orcs, Jay Chou sang In the Lord of the Rings, Orc represents the arrival of 8 to 12, or even 3-4 for the next year. They only have to work every day except for eating, drinking, and sleeping. The Lord's whip is the kind of weapon that keeps building, smoke, fire, and roasting. Never think about overtime. If you are in poor health, you may be deemed to be under Insufficient Pressure and need to

This article mainly introduces the PHP identity card recognition Orc method implementation, has a certain reference value, now share to everyone, the need for friends can refer to First create an HTML and transfer it to a PHP file in JSON format Create another upload.php //getreqsign: Calculate request signature based on interface request parameters and application key//-$params: Interface Request parameters (Special note: Different interfaces,

Android ORC text recognition-identification ID card number (with source code), androidorc Project addressHttps://github.com/979451341/OrcTestLet's talk about the functions implemented in this project. We can pass Bitmap of this image to the code of tess-two to get the scan result.Here I will post the address of the text recognition framework created for Android, tess-two.Https://github.com/rmtheis/tess-twoNext, let's talk about how to implement the pr

The following content of this article will be updated here: "http-flv Live Module (nginx-http-flv-module) based on Nginx-rtmp-module module" continued. Note: Many of the configurations below are no longer available because the implementation is somewhat different from the earlier implementations. In order to see the hi

format, same as Time.strftime ()Stream: Specifies the output stream that will log, can specify output to Sys.stderr,sys.stdout or file, default output to Sys.stderr, stream is ignored when stream and filename are specified simultaneouslyLogging.getlogger ([name]): Create a Log object:Returns a logger instance that returns root logger if no name is specified. As long as name is the same, the returned logger instances are the same and only one, that is, the name and the logger instance are one by

the directory if it is empty, if the upper level is also empty, also delete, etc.# Os.removedirs (R ' a/b/c/d ')# Delete a file# Os.remove (R ' d ')# os.rename (' oldname ', ' newname ')# get file \ Directory information# Obj=os.stat (R '/users/zhangrenguo/pycharmprojects/passers-by dialogue/day18/os module. Py ')# print (obj)# The path delimiter for the current file# Print (OS.SEP)# line Delimiter# Print (OS.LINESEP)# Environment Delimiter# Print (O

Regular expressionsMeta-character quantifier (?)Metacharacters:.\w \d \s \w \d \s\ t \ \b() |[] [^]^ $Quantifiers:* + ?{n}, {n,}, {n,m}Re moduleHow to invoke the RE moduleFind: FindAll search match FinditerSplit and replace: Split Sub SubnCompile: Compile Save timeHow many places is the RE module used in?Quantifier: Indicates a match 0 or 1 timesAfter the quantifier: is the sign of the lazy matchGroup naming: (? pFindall/split Ungroup Priority: (?: Re

1.math Module >>> dir (Math) [' __doc__ ', ' __name__ ', ' __package__ ', ' ACOs ', ' acosh ', ' asin ', ' Asinh ', ' atan ', ' atan2 ', ' Atanh ', ' ceil ', ' copysign ', ' Co S ', ' cosh ', ' degrees ', ' e ', ' Erf ', ' erfc ', ' exp ', ' expm1 ', ' fabs ', ' factorial ', ' floor ', ' fmod ', ' frexp ', ' fsum ', ' Gamma ', ' Hypot ', ' isinf ', ' isNaN ', ' ldexp ', ' lgamma ', ' Log ', ' log10 ', ' log1p ', ' modf ', ' pi ', ' pow ', ' radians

one, sys module1. Definition:A module that interacts with the Python interpreter2, sys module commonly used methods(1) sys.argv methodDefinition: Command line Arguments list, the first element is the path of the program itselfCases:Import Sysprint (SYS.ARGV) # SYS.ARGV just reflects the current module name, with a list of # and Pycharm software automatically adds

Operating system: Windows Server R2 (64-bit)C:\Windows\System32\WindowsPowerShell\v1.0\Modules under the Servermanager, but still can not find.To solve this problem, it takes 2 steps:1. Implementation strategy in PowerShell (execution policy)One reason is that the default execution policy for PowerShell is restricted, which means that you can run a single command, but you cannot run scripts, including format and configuration files (. ps1xml), module

Call the Microsoft Office Document Imaging class library The source code is as follows: Public MODI. Document _ MODIDocument;Private void SetImage (string filename){ // Bitmap nump = new Bitmap ();// Bitmap myBitmap1 = new Bitmap (new fa;// Set the