Trumpet: Timely and Precise Triggers in Data Centers

As data centers grow larger and strive to provide tight performance
and availability SLAs, their monitoring infrastructure
must move from passive systems that provide aggregated
inputs to human operators, to active systems that enable programmed
control. In this paper, we propose Trumpet, an
event monitoring system that leverages CPU resources and
end-host programmability, to monitor every packet and report
events at millisecond timescales. Trumpet users can express
many network-wide events, and the system efficiently detects
these events using triggers at end-hosts. Using careful design,
Trumpet can evaluate triggers by inspecting every packet at
full line rate even on future generations of NICs, scale to
thousands of triggers per end-host while bounding packet
processing delay to a few microseconds, and report events
to a controller within 10 milliseconds, even in the presence
of attacks. We demonstrate these properties using an implementation
of Trumpet, and also show that it allows operators
to describe new network events such as detecting correlated
bursts and loss, identifying the root cause of transient congestion,
and detecting short-term anomalies at the scale of a data
center tenant.



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