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1, Foreword 1. What is RestFul? REST: representational state transfer. If an architecture conforms to the REST principle, it is called RESTful architecture style. Resource: the so-called "resource" is an entity on the network, or a specific information on the network. Presentation layer: the form in which we present "r ...

preface For small partners unfamiliar with openGL, here is the drawing process: Calculate projection matrix, object change matrix, viewing angle matrixThe vertex cache of the incoming object,Pass parameters into the shader (including the matrix above)Determining the position of a point on the screen in the vertex shader is generally the multi ...

Replica fragmentation request process, function entry: industriesclusterstateservice createOrUpdateShards org.elasticsearch.indices.cluster.IndicesClusterStateService private void createOrUpdateShards(final ClusterState state) { RoutingNode localRoutingNode = state.getRoutingNodes().node(state.nodes().getLocalNodeId()); if ...

Installation and configuration of Monstache monstache is a go daemon that can synchronize MongoDB data to Elasticsearch in real time. preparation Ready for mongodb4 4.6 replica set environment The Elasticsearch 7 environment is ready github source code address of monstache: https://github.com/rwynn/monstache monstachemongodbelashticsearch53 ...

brief introduction An open source search engine based on Apache Lucene(TM). Due to the complexity of using Lucene, ElasticSearch aims to make full-text search simple through RESTful API. Basic concepts 1. Near real time NRT When full-text search is not true, there is usually a delay. Different search engines have a core search delay time. T ...

1 prepare the installation environment 1.1 installing JDK elasticsearch 7.1.1 configuring java8, java11 1.2 change system resource configuration Modify / etc / sysctl Conf file, add VM. Conf at the end of the file max_ map_ count=262144 Note: after modification, execute sysctl -p, and load system parameters from the specified file. If ...

If you have any questions about how to set up security for Elasticsearch cluster, please read my previous article“ Elasticsearch: set Elastic account security ”. Security is very important for an elastic search. Otherwise, our cluster is running naked. Before the following exercises, it is recommended to refer to the article“ ...

0. Introduction Recently, when synchronizing part of the company's mysql data to es, the Logstash input JDBC for full synchronization，Incremental synchronization with canal However, another problem is that the data structure in ES needs to be redesigned, which leads to the need for some mysql fields to be transformed and then synchronized to ...

1, Background There are many basic data types of ES. This article focuses on string types: ES2.* There are no these two fields in the version, only the string field. ES5.* And later versions, set the string field as an obsolete field and introduce the text and keyword fields. The basic data types of ES may vary slightly according to differ ...

In< Basic operations of index and document in Elastic >It introduces the basic knowledge of Elastic, index and document operation; This section describes the query and aggregation operations commonly used in Elasticsearch. search Foundation Elasticsearch will segment the document content and establish an inverted index according to ...