prefect.utilities.services
¶
critical_service_loop
async
¶
Runs the given workload
function on the specified interval
, while being
forgiving of intermittent issues like temporary HTTP errors. If more than a certain
number of consecutive
errors occur, print a summary of up to memory
recent
exceptions to printer
, then begin backoff.
The loop will exit after reaching the consecutive error limit backoff
times.
On each backoff, the interval will be doubled. On a successful loop, the backoff
will be reset.
Parameters:
Name | Type | Description | Default |
---|---|---|---|
workload |
Callable[..., Coroutine]
|
the function to call |
required |
interval |
float
|
how frequently to call it |
required |
memory |
int
|
how many recent errors to remember |
10
|
consecutive |
int
|
how many consecutive errors must we see before we begin backoff |
3
|
backoff |
int
|
how many times we should allow consecutive errors before exiting |
1
|
printer |
Callable[..., None]
|
a |
print
|
run_once |
bool
|
if set, the loop will only run once then return |
False
|
jitter_range |
float
|
if set, the interval will be a random variable (rv) drawn from
a clamped Poisson distribution where lambda = interval and the rv is bound
between |
None
|
Source code in prefect/utilities/services.py
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