Working with Storm Topologies
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Configuring Topology Event Logging

Event logging sends events (tuples) from each component to an internal eventlogger bolt.

Event logging is disabled by default, due to a slight performance degradation associated with eventlogger tasks.

To enable event logging, set the topology.eventlogger.executors property to a non-zero value when submitting your topology. You can set the property globally in the storm.yaml file, or use the command line. For more information about topology.eventlogger.executors and other property settings, see Configuring Apache Storm for Production Environments.