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The original application ran with a single node, and the user always complained that the service response was very slow. In order to improve the user experience, we thought of trying to alleviate the multi-node load balancing Because of the pressure of the server, we found the window version of nginx. According to the introduction of the para ...

The last one is a brief introduction to SPARQL. This article introduces the basic schema query of SPARQL Still use the example from the previous article: <rdf:RDF xmlns:rdf='http://www.w3.org/1999/02/22-rdf-syntax-ns#' xmlns:vCard='http://www.w3.org/2001/vcard-rdf/3.0#' > <rdf:Description rdf:about="http://somew ...

Struts 2 provides the stream result type, which is specifically used to support the file download function. The following four properties are required to configure the result of stream type. contentType: Specifies the file type of the downloaded file inputName: Specifies the entry input stream of the downloaded file contentDispositio ...

Print stream: There are two classes: PrintStream and PrintWriter. The methods of the two classes are the same. The difference lies in the constructor PrintStream: construction method: receive File type, receive string File name, receive byte output stream PringWriter: construction method: receive File type, receive string File name, receive byt ...

Hbase API create table error record Demo method: import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.hbase.HBaseConfiguration; import org.apache.hadoop.hbase.HColumnDescriptor; import org.apache.hadoop.hbase.HTableDescriptor; import org.apache.hadoop.hbase.TableName; import org.apache.hadoop.hbase.client.Admin; import org.apa ...

Springboot configuration log configuration file location logging.config: classpath:logging/logback.yml Spring boot log classification log4j: an open source log component implemented by apache logback: it is also designed by the author of log4j. It has better features. It is a log framework used to replace log4j and is the native implementation ...

In this lesson, we mainly introduce the entry program of Flink and the implementation of SQL form. In the last lesson, we have explained Flink's common application scenarios and architecture model design. In this lesson, we will start from a simple WordCount case and implement it in SQL mode at the same time, laying a solid foundation for the l ...

The article was originally written in Mars team column , welcome to follow. From this article, we start a new series of reading paper. Today's paper is Towards Scalable Dataframe Systems , is still a preprint. By Devin Petersohn from Riselab , formerly known as APMLab, the lab has produced a series of famous open source projects, such as Apache ...

  Log4j output log to separate log file 09:01:03, January 31, 2018 Number of readings: 1065 Under normal circumstances, the info log of log4j will be printed to a unified log file. When you need to view the execution of a specific function, print a specific function to a specific ...

quick get start install Docker installation single Kafka docker pull wurstmeister/zookeeper docker pull wurstmeister/kafka docker run -d --name zookeeper -p 2181:2181 wurstmeister/zookeeper docker run -d --name kafka -p 9092:9092 -e KAFKA_BROKER_ID=0 -e KAFKA_ZOOKEEPER_CONNECT=Host computer IP:2181 -e KAFKA_ADVERTISED_LISTENERS=PLAINTEXT://127 ...