YARN Log Aggregation
The YARN Log Aggregation option aggregates and moves log files
for completed applications from the local file system to the
MapR-FS. This allows users to view the entire set of logs for a
particular application using the HistoryServer UI or by running the
yarn logs
command.
By default, YARN container logs are not aggregated on the
MapR-FS. Instead, the logs are retained for 3 hours on the local
file system before they are deleted. To enable YARN log
aggregation or to edit the configuration of YARN log aggregation,
you must edit the yarn-site.xml file in the following directory:
/opt/mapr/hadoop/hadoop-2.x.x/etc/hadoop/