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Catalog Zero, code Xian inspirational I. running in Linux II. Running in Hadoop environment Zero, code Xian inspirational I. running in Linux First, create the following directory in Linux, do not put anything in it, and then enter the directory /home/hadoopuser/mydoc/py Then create a ddd.txt file in it Write the foll ...

Error 1 when hive starts Cannot execute statement:impossible to write to binary long since BINLOG_FORMAT = STATEMENT... //Error when starting Caused by: javax.jdo.JDOException:Couldnt obtain a new sequence(unique id):Cannot execute statement:impossible to write to binary log since BINLOG_FORMAT = STATEMENT and at least one table uses a storage ...

When installing through brew on mac system, the local default installation address is / usr / local / cell / Apache Flink / 1.5.1 1. Can I call graph algorithm in flink? It can be called in dataSet, and it needs to write its own method in dataStream. It can be implemented in scala by itself, just by r ...

namenodelists="nnip1,nnip2" nn1=$(echo $namenodelists | cut -d "," -f 1) nn2=$(echo $namenodelists | cut -d "," -f 2) nn1state=$(curl "http://$nn1:50070/jmx?qry=Hadoop:service=NameNode,name=NameNodeStatus"|grep -c active) nn2state=$(curl "http://$nn2:50070/jmx?qry=Hadoop:service=NameNode,name=NameNodeStatus"|grep -c active) source /etc ...

I. MapReduce overview 1, definition Is a distributed computing programming framework. The core function is to integrate the business logic code written by the user and the default components into a complete distributed program, which runs on a hadoop cluster concurrently. 2. Advantages and disadvantages (1) advantages1 > easy to program: wi ...

The compression mode with lzo enabled is very useful for small-scale clusters. The compression ratio can be reduced to about 1 / 3 of the original log size. At the same time, the speed of decompression is faster. install Prepare jar package 1) Download lzo's jar project firsthttps://github.com/twitter/hadoop-lzo/archive/master.zip 2) the na ...

I. Deployment environment Local IP: 192.168.0.222 System: CentOS Linux release 7.6.1810 (Core) Kernel: 3.10.0-957.el7.x86_64 II. Installation of docker-ce yum install -y yum-utils device-mapper-persistent-data lvm2 && yum-config-manager --add-repo https://download.docker.com/linux/centos/doc ...

Writing MapReduce Program Writing wordcount Program Scenario: There are a lot of files in which words are stored and one word occupies one line. Task: How to count the number of occurrences of each word Similar application scenarios: Statistics of the most popular K search terms in search engines Stati ...

Inverted index is a variant of word frequency statistics, in fact, it is also a word frequency statistics, but this word frequency statistics need to add the name of the file. Inverted index is widely used for full-text retrieval. The final result of the inverted index is a collection of the number o ...

Links to the original text: https://www.oipapio.com/cn/article-2689341 Business scenario Spark knows how to read files according to InputFormat. By default, it reads files according to one line. In some specific cases, Spark's default Inpu ...