Apache Nifi 简明教程

Apache NiFi - Logging

Apache NiFi使用logback库来处理其日志记录。NiFi的conf目录中有一个文件logback.xml，用于配置NiFi中的日志记录。日志记录在NiFi的logs文件夹中生成，日志文件如下所述。

Apache NiFi uses logback library to handle its logging. There is a file logback.xml present in the conf directory of NiFi, which is used to configure the logging in NiFi. The logs are generated in logs folder of NiFi and the log files are as described below.

nifi-app.log

这是nifi的主要日志文件，记录了apache NiFi应用程序的所有活动，从NAR文件加载到NiFi组件遇到的运行时错误或公告。下面是 logback.xml 文件中 nifi-app.log 文件的默认附加程序。

This is the main log file of nifi, which logs all the activities of apache NiFi application ranging from NAR files loading to the run time errors or bulletins encountered by NiFi components. Below is the default appender in logback.xml file for nifi-app.log file.

<appender name="APP_FILE"
class="ch.qos.logback.core.rolling.RollingFileAppender">
   <file>${org.apache.nifi.bootstrap.config.log.dir}/nifi-app.log</file>
   <rollingPolicy
      class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
      <fileNamePattern>
         ${org.apache.nifi.bootstrap.config.log.dir}/
	      nifi-app_%d{yyyy-MM-dd_HH}.%i.log
      </fileNamePattern>
      <maxFileSize>100MB</maxFileSize>
      <maxHistory>30</maxHistory>
   </rollingPolicy>
   <immediateFlush>true</immediateFlush>
   <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
      <pattern>%date %level [%thread] %logger{40} %msg%n</pattern>
   </encoder>
</appender>

附加程序名称为APP_FILE，类为RollingFileAppender，这意味着logger正在使用回滚策略。默认情况下，最大文件大小为100 MB，可更改为所需大小。APP_FILE的最大保留时间为30个日志文件，可以根据用户要求进行更改。

The appender name is APP_FILE, and the class is RollingFileAppender, which means logger is using rollback policy. By default, the max file size is 100 MB and can be changed to the required size. The maximum retention for APP_FILE is 30 log files and can be changed as per the user requirement.

nifi-user.log

此日志包含用户事件，如Web安全、Web API配置、用户授权等。下面是在logback.xml文件中nifi-user.log的附加程序。

This log contains the user events like web security, web api config, user authorization, etc. Below is the appender for nifi-user.log in logback.xml file.

<appender name="USER_FILE"
   class="ch.qos.logback.core.rolling.RollingFileAppender">
   <file>${org.apache.nifi.bootstrap.config.log.dir}/nifi-user.log</file>
   <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
      <fileNamePattern>
         ${org.apache.nifi.bootstrap.config.log.dir}/
	      nifi-user_%d.log
      </fileNamePattern>
      <maxHistory>30</maxHistory>
   </rollingPolicy>
   <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
      <pattern>%date %level [%thread] %logger{40} %msg%n</pattern>
   </encoder>
</appender>

附加程序名称为USER_FILE。它遵循轮换策略。USER_FILE的最大保留时间是30个日志文件。下面是nifi-user.log中存在的USER_FILE附加程序的默认记录器。

The appender name is USER_FILE. It follows the rollover policy. The maximum retention period for USER_FILE is 30 log files. Below is the default loggers for USER_FILE appender present in nifi-user.log.

<logger name="org.apache.nifi.web.security" level="INFO" additivity="false">
   <appender-ref ref="USER_FILE"/>
</logger>
<logger name="org.apache.nifi.web.api.config" level="INFO" additivity="false">
   <appender-ref ref="USER_FILE"/>
</logger>
<logger name="org.apache.nifi.authorization" level="INFO" additivity="false">
   <appender-ref ref="USER_FILE"/>
</logger>
<logger name="org.apache.nifi.cluster.authorization" level="INFO" additivity="false">
   <appender-ref ref="USER_FILE"/>
</logger>
<logger name="org.apache.nifi.web.filter.RequestLogger" level="INFO" additivity="false">
   <appender-ref ref="USER_FILE"/>
</logger>

nifi-bootstrap.log

此日志包含自举日志、apache NiFi的标准输出（所有主要用于调试在代码中编写的system.out）和标准错误（所有在代码中编写的system.err）。下面是logback.log中nifi-bootstrap.log的默认附加程序。

This log contains the bootstrap logs, apache NiFi’s standard output (all system.out written in the code mainly for debugging), and standard error (all system.err written in the code). Below is the default appender for the nifi-bootstrap.log in logback.log.

<appender name="BOOTSTRAP_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
   <file>${org.apache.nifi.bootstrap.config.log.dir}/nifi-bootstrap.log</file>
   <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
      <fileNamePattern>
         ${org.apache.nifi.bootstrap.config.log.dir}/nifi-bootstrap_%d.log
      </fileNamePattern>
      <maxHistory>5</maxHistory>
   </rollingPolicy>
   <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
      <pattern>%date %level [%thread] %logger{40} %msg%n</pattern>
   </encoder>
</appender>

nifi-bootstrap.log文件中的附加程序名称为BOOTSTRAP_FILE，它也遵循回滚策略。BOOTSTRAP_FILE附加程序的最大保留时间是5个日志文件。下面是nifi-bootstrap.log文件的默认记录器。

nifi-bootstrap.log file,s appender name is BOOTSTRAP_FILE, which also follows rollback policy. The maximum retention for BOOTSTRAP_FILE appender is 5 log files. Below is the default loggers for nifi-bootstrap.log file.

<logger name="org.apache.nifi.bootstrap" level="INFO" additivity="false">
   <appender-ref ref="BOOTSTRAP_FILE" />
</logger>
<logger name="org.apache.nifi.bootstrap.Command" level="INFO" additivity="false">
   <appender-ref ref="CONSOLE" />
   <appender-ref ref="BOOTSTRAP_FILE" />
</logger>
<logger name="org.apache.nifi.StdOut" level="INFO" additivity="false">
   <appender-ref ref="BOOTSTRAP_FILE" />
</logger>
<logger name="org.apache.nifi.StdErr" level="ERROR" additivity="false">
   <appender-ref ref="BOOTSTRAP_FILE" />
</logger>