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From Derek Dagit <>
Subject Re: Spout process latency
Date Wed, 09 Jul 2014 20:28:26 GMT
It should be a windowed average measure of the time between when the component receives a tuple
and when it acks the tuple.

This can be slower if there is batching, aggregating, or joining happening (the component
must wait for a number of other tuples to arrive before it can ack).

On the UI, there are tool tips that explain the measurements.  They appear after hovering
over the label.

On 7/9/14, 15:22, Raphael Hsieh wrote:
> Can somebody explain to me what might cause the spout to have a large
> process latency? Currently my spout0 and $spoutcoord-spout0 have latency's
> higher than I would like.
> I'm consuming data from a Kafka stream.
> How is this process latency measured ?
> Is it measuring the amount of time it takes to fill a batch with data and
> send it to the first bolt in the topology?
> Thanks

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