Definition of Timestamp

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Different versions of the same data for the index, the timestamp type is 64-bit integer. Timestamp can be automatically assigned by the customer or by the explicit assignment when data is written to HBase.

Other related questions:
How to disable the timestamp in logs on S series switches
For S series switches (except the S1700), logs, traps and debug messages carry a timestamp by default to record the time when the message is generated. You can run the following commands in the system view to disable the timestamp in logs: - info-center timestamp log none - info-center timestamp trap none - info-center timestamp debugging none

How to enable the timestamp in logs for S series switches
For S series switches (except the S1700), logs, traps, and debug messages contain a timestamp by default to record the time when the message is generated. If messages do not contain a timestamp, run the display this command in the system view to check whether the following commands are configured and the timestamp function is disabled: - info-center timestamp log none - info-center timestamp trap none - info-center timestamp debugging none If the timestamp function is disabled, run the undo info-center timestamp command to restore default settings.

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.

Definition of Flume
Flume is a distributed, highly reliable, and HA massive log aggregation system. It supports custom data transmitters for data collection. Flume also processes data roughly and writes data to customizable receivers.

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