Ranger Log Overview

Log Description

Log path: The default storage path of Ranger logs is /var/log/Bigdata/ranger/Role name.

RangerAdmin: /var/log/Bigdata/ranger/rangeradmin (run logs)
TagSync: /var/log/Bigdata/ranger/tagsync (run logs)
UserSync: /var/log/Bigdata/ranger/usersync (run logs)

Log archive rule: The automatic compression and archive function is enabled for Ranger logs. By default, when the size of a log file exceeds 20 MB, the log file is automatically compressed. The naming rule of the compressed log file is as follows: <Original log file name>-<yyyy-mm-dd_hh-mm-ss>.[ID].log.zip. A maximum of 20 compressed file are retained.

**Table 1** HDFS log list
Type	Name	Description
RangerAdmin run log file	access_log.<DATE>.log	Tomcat access log
	catalina.out	Tomcat service run log
	gc-worker.log	RangerAdmin garbage collection (GC) log
	postinstallDetail.log	Work log generated after an instance is started before installation
	prestartDetail.log	Log that records preparations before instance startup
	ranger-admin-<hostname>.log	RangerAdmin run log
	ranger_admin_sql-<hostname>.log	RangerAdmin log used to retrieve DBService
	startDetail.log	Instance startup log
TagSync run log	cleanupDetail.log	Instance clearing log
	gc-worker.log	GC log file of an instance
	postinstallDetail.log	Work log generated after an instance is started before installation
	prestartDetail.log	Log that records preparations before instance startup
	ranger-tagsync-<hostname>.log	TagSync run log
	startDetail.log	Instance startup log
	tagsync.out	TagSync run log
UserSync run log	auth.log	UnixAuth service run log
	cleanupDetail.log	Instance clearing log
	gc-worker.log	GC log file of an instance
	postinstallDetail.log	Work log generated after an instance is started before installation
	prestartDetail.log	Log that records preparations before instance startup
	ranger-usersync-<hostname>.log	UserSync run log
	startDetail.log	Instance startup log

Log Levels

Table 2 describes the log levels provided by HDFS. The priorities of log levels are FATAL, ERROR, WARN, INFO, and DEBUG in descending order. Logs whose levels are higher than or equal to the specified level are printed. The number of printed logs decreases as the specified log level increases.

**Table 2** Log levels
Level	Description
FATAL	Logs of this level record fatal error information about the current event processing that may result in a system crash.
ERROR	Logs of this level record error information about the current event processing, which indicates that system running is abnormal.
WARN	Logs of this level record abnormal information about the current event processing. These abnormalities will not result in system faults.
INFO	Logs of this level record normal running status information about the system and events.
DEBUG	Logs of this level record the system information and system debugging information.

To modify log levels, perform the following operations:

Log in to FusionInsight Manager.
Choose Cluster > Services > Ranger > Configurations.
Select All Configurations.
On the menu bar on the left, select the log menu of the target role.
Select a desired log level.
Click Save. In the displayed dialog box, click OK to make the configuration take effect.

The configurations take effect immediately without the need to restart the service.

Log Formats

The following table lists the Ranger log formats.

**Table 3** Log formats
Type	Format	Example Value
Run log	<yyyy-MM-dd HH:mm:ss,SSS>\|<Log level>\|<Name of the thread that generates the log>\|<Message in the log>\|<Location where the log event occurs>	2020-04-29 20:09:28,543 \| INFO \| http-bio-21401-exec-56 \| Request comes from API call, skip cas filter. \| CasAuthenticationFilterWrapper.java:25