Apache Ambari User Guide
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Viewing Access Logs

When troubleshooting HDFS related issues, it can be very helpful to search for and spot trends in HDFS access by users. The Access Logs tab allows you to view HDFS Audit log entries by time, and see aggregated usage data showing the top ten HDFS users by file system resources accessed, as well as the top ten file system resources accessed across all users. This can be helpful for looking for anomalies or hot/cold data sets.