Online log analysis method, system, equipment and medium

The invention relates to the technical field of information processing, and provides an online log analysis method, system and device and a medium, and the method comprises the steps: obtaining a log message and a corresponding log message length; grouping the log messages according to the lengths of the log messages, dividing similar log messages into one class in the same group, counting the number of different marks at each position of a non-public sequence of the same class of log messages in the group, and performing in-class grouping operation on the group if the number is smaller than a threshold value; and after grouping, using frequency analysis in each group, and constructing a log message template tree. Trivial dynamic variable marks are recognized through a regular expression; creating a similar log event group by calculating log message similarity; performing frequency analysis on the instances in the same group to distinguish constant and variable marks; by constructing the log message template