Log Overview

This section applies to MRS 3.x and later versions.

Log Description

Log path: The default save path of Tez logs is /var/log/Bigdata/tez/role name.

TezUI: /var/log/Bigdata/tez/tezui (run logs) and /var/log/Bigdata/audit/tez/tezui (audit logs)

Log archive rule: The automatic compression and archiving function of Tez is enabled. By default, when the size of a log file exceeds 20 MB (which is adjustable), 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 latest compressed files are retained. The number of compressed files and compression threshold can be configured.

**Table 1** Tez log list
Log Type	Name	Description
Run log	tezui.out	Log file that records TezUI running environment information
	tezui.log	Run log of the TezUI process
	tezui-omm-<Date>-gc.log.<No.>	GC log of the TezUI process
	prestartDetail.log	Work logs generated before the TezUI is started
	check-serviceDetail.log	Log file that records whether the TezUI service starts successfully
	postinstallDetail.log	Work logs after the TezUI is installed
	startDetail.log	Startup log of the TezUI process
	stopDetail.log	Stop log of the TezUI process
Audit log	tezui-audit.log	TezUI audit log

Log Level

Table 2 describes the log levels supported by TezUI.

Levels of run logs are ERROR, WARN, INFO, and DEBUG from the highest to the lowest priority. Run logs of equal or higher levels are recorded. The higher the specified log level, the fewer the logs recorded.

**Table 2** Log levels
Level	Description
ERROR	Logs of this level record error information about system running.
WARN	Exception information about the current event processing
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 Manager.
Choose Cluster > Service > Tez > Configuration.
Select All Configurations.
In the navigation pane, choose TezUI > Log.
Select a desired log level.
Click Save. In the dialog box that is displayed, click OK to save the configuration.
Click Instance, select the TezUI role, choose More > Restart Instance, enter the user password, and click OK in the dialog box that is displayed.
Wait until the instance is restarted for the configuration to take effect.

Log Format

The following table lists the Tez log formats.

**Table 3** Log formats
Log Type	Format	Example
Run log	<yyyy-MM-dd HH:mm:ss,SSS>\|<LogLevel>\|<Thread that generates the log>\|<Message in the log>\|<Location of the log event>	2020-07-31 11:44:21,378 \| INFO \| TezUI-health-check \| Start health check \| com.XXX.tez.HealthCheck.run(HealthCheck.java:30)
Audit logs	<yyyy-MM-dd HH:mm:ss,SSS>\|<LogLevel>\|<Thread that generates the log>\|<User Name><User IP><Time><Operation><Resource><Result><Detail >\|< Location of the log event >	2018-12-24 12:16:25,319 \| INFO \| HiveServer2-Handler-Pool: Thread-185 \| UserName=hive UserIP=10.153.2.204 Time=2018/12/24 12:16:25 Operation=CloseSession Result=SUCCESS Detail= \| org.apache.hive.service.cli.thrift.ThriftCLIService.logAuditEvent(ThriftCLIService.java:434)