Implement exponential backoff retry mechanism for transport tasks #1837
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@@ Coverage Diff @@
## develop #1837 +/- ##
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+ Coverage 66.69% 66.73% +0.03%
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Files 317 317
Lines 32407 32406 -1
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+ Hits 21613 21625 +12
+ Misses 10794 10781 -13
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JobProcesses have various tasks the need to execute that require a transport, which can then fail for various reasons due to the command executed over the transport excepting. Examples are the submission of a job calculation as well as updating its scheduler state. These may fail for reasons that do not necessarily mean that the job is unrecoverably lost, such as the internet connection being temporarily unavailable or the scheduler simply not responding. Instead of putting the process in an excepted state, the engine should automatically retry at a later stage. Here we implement the exponential_backoff_retry utility, which is a coroutine that can wrap another function or coroutine and will try to run it, and rerun it when an exception is caught. When an exception is caught as many times as the maximum number of allowed attempts, the exception is reraised. This is implemented in the various transport tasks that are called by the Waiting state of the JobProcess class: * task_submit_job: submit the calculation * task_update_job: update the scheduler state * task_retrieve_job: retrieve the files of the completed calc * task_kill_job: kill the job through the scheduler These are now wrapped in the exponential_backoff_retry coroutine, which will give the process some leeway when they fail for reasons that may often resolve themselves, when given the time.
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Fixes #1834
JobProcesses have various tasks the need to execute that require
a transport, which can then fail for various reasons due to the
command executed over the transport excepting. Examples are the
submission of a job calculation as well as updating its scheduler
state. These may fail for reasons that do not necessarily mean that
the job is irrecoverably lost, such as the internet connection being
temporarily unavailable or the scheduler simply not responding.
Instead of putting the process in an excepted state, the engine
should automatically retry at a later stage.
Here we implement the exponential_backoff_retry utility, which is a
coroutine that can wrap another function or coroutine and will try
to run it, and rerun it when an exception is caught. When an
exception is caught as many times as the maximum number of allowed
attempts, the exception is re-raised.
This is implemented in the various transport tasks that are called
by the Waiting state of the JobProcess class:
These are now wrapped in the exponential_backoff_retry coroutine,
which will give the process some leeway when they fail for reasons
that may often resolve themselves, when given the time.