Logging raw data（记录原始数据）
Logging the raw stream of data flowing through the ingest pipeline is not desired behaviour in many production environments because this may result in leaking sensitive data or security related configurations, such as secret keys, to Flume log files. By default, Flume will not log such information. On the other hand, if the data pipeline is broken, Flume will attempt to provide clues for debugging the problem.
One way to debug problems with event pipelines is to set up an additional Memory Channel connected to a Logger Sink, which will output all event data to the Flume logs. In some situations, however, this approach is insufficient.
In order to enable logging of event- and configuration-related data, some Java system properties must be set in addition to log4j properties.
To enable configuration-related logging, set the Java system property -Dorg.apache.flume.log.printconfig=true. This can either be passed on the command line or by setting this in
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