How do you know you need more ackers?

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Chip Salzenberg

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Jan 29, 2012, 5:48:27 PM1/29/12

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Is the acker latency, as reported by ui, an adequate indication of
whether I need more ackers? Or is there something else to watch?

Nathan Marz

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Jan 31, 2012, 4:34:08 AM1/31/12

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The hard indication that you need more ackers is if your spouts start failing a lot of tuples for no apparent reason. This means the ackers are bottlenecked and are not sending completion messages before the topology timeout.

A better metric to use to understand the load on the ackers is messages processed per acker task per second.

On Sun, Jan 29, 2012 at 2:48 PM, Chip Salzenberg <rev....@gmail.com> wrote:

Is the acker latency, as reported by ui, an adequate indication of
whether I need more ackers? Or is there something else to watch?