Definition of Inverted index

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An index that lists an attribute value and locations of records that have such an attribute value. The attribute value determines the record location, instead of being determined by records. Therefore, it is called inverted index.

Other related questions:
How to configure time segment indexes on the U1900?
1. For versions earlier than V200R003C00, you can run the config add timerange command to add time segment indexes. 2. For V200R003C00 and later versions, you can configure time segment indexes on the web UI. For details, see Configuration > Feature Guide > Automatic Switchboard in the U1900 product documentation.

Definition of Kafka
Kafka is a distributed, partitioned, and replicated message publishing and subscription system that provides features similar to the Java Message Service (JMS). Kafka features message persistence, high throughput, distribution, multi-client support, and real-time processing, and applies to online and offline message consumption. It is ideal for Internet service data collection scenarios, such as conventional data collection, active website tracing, aggregation of operation data in statistics systems (monitoring data), and log collection.

Definition of Tomcat
Tomcat is a free-of-charge, lightweight, open source web application server developed by Apache Software Foundation, Sun and other companies, and individuals. Gaining support from Sun, Tomcat complies with the latest Servlet and JavaServer Page (JSP) specifications. It features advanced technology, stable performance, and good scalability, and occupies a small number of system resources during running. As a result, Tomcat applies to small- and medium-sized systems and scenarios with a few concurrent users. An HTTP server embedded in Tomcat enables Tomcat to work as a web server. It provides a configuration management tool and supports XML configuration files. Tomcat is different from the Apache web server, which is an HTTP server using C language.

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