Updated on 2022-08-12 GMT+08:00

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:

  1. Log in to FusionInsight Manager.
  2. Choose Cluster > Services > Ranger > Configurations.
  3. Select All Configurations.
  4. On the menu bar on the left, select the log menu of the target role.
  5. Select a desired log level.
  6. 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