Splunk Stream

Installation and Configuration Manual

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This documentation does not apply to the most recent version of Splunk Stream. For documentation on the most recent version, go to the latest release.
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Stream forwarder sizing guide

The maximum number of Stream forwarders (streamfwd) that a search head can support depends on the value of the pingInterval parameter in streamfwd.conf. Based on tests, a single search head running splunk_app_stream can process approximately 150 pings + Stream configuration requests per second.

Use this formula to calculate the maximum number of Stream forwarders per search head:

Stream forwarders per search head = 150 * pingInterval

The default pingInterval setting is 5 seconds, so a single search head can run up to 750 Stream forwarders at peak activity (during startup up or when stream configuration changes are made).

During average usage a single search head running splunk_app_stream can process approximately 400 ping requests/second. However, the startup load on the CPU is significantly higher because streamfwd must both send a ping request and pull down the full configuration from splunk_app_stream.

If your deployment includes large numbers of Stream forwarders, we suggest that you run splunk_app_stream on a dedicated server AND stagger the startup of individual Stream forwarders over time. Starting up too many Stream forwarders simultaneously might overload the server.

Last modified on 16 September, 2020
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This documentation applies to the following versions of Splunk Stream: 7.1.2, 7.1.3, 7.2.0


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