The Filter class

To address the issue discussed above, Hadoop provides a filter class, which provides regular expressions to filter the metrics and make it more compact and meaningful as follows:

*.source.filter.class=org.apache.hadoop.metrics2.filter.GlobFilter
*.record.filter.class=${*.source.filter.class}
*.metric.filter.class=${*.source.filter.class}

The syntax of the filter class is explained as follows:

subsystem.[sink|source].sink_name.[sources|record|metric].filter.[include|exclude]
subsystem – daemon: hbase, yarn, hdfs, etc
sink|source – sink or source for feed
sink_name – name of sink used
sources|record|metric – level of filter to operate
include|exclude – will filter exclude or include metrics.

The filters can be applied at the level of source, record, or metrics and constructed with regex for trimming the information generated by the metrics system.