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Last Updated: Nov 02, 2017


Log is an abstraction of system changes during the running process. The log content is a time-ordered collection of some operations and the corresponding operation results of specified objects. LogFile, Event, BinLog, and Metric data are different carriers of logs. In LogFile, every log file is composed of one or more logs, and every log describes a single system event. The log is the minimum data unit processed in Log Service.

Log group

A log group is a collection of logs and is the basic unit for writing and reading.

Log topic

Logs in a Logstore can be classified by log topics. You can specify the topic when writing and querying logs.


The project is the resource management unit in Log Service and is used to isolate and control resources. You can manage all the logs and the related log sources of an application by using projects. Projects manage the information of all your Logstores and the log collection machine configuration, and serve as the portals where you can access the Log Service resources.


The Logstore is a unit in Log Service for the collection, storage, and query of log data. Each Logstore belongs to a project, and each project can create multiple Logstores.


Each Logstore is divided into several shards and each shard is composed of MD5 left-closed and right-open intervals. Each interval range does not overlap with others and the total range of all the intervals is the entire MD5 value range.

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