sometimes I get "unconsumed deferred in error state, make sure you're using `catch`"

[David Smith]

I have a crawler that has a deferred/catch block. This block works as I
can see from the logs that I get the error reporting I want from the
exception that I expect. However we have noticed that we get some warnings
every now and again of "unconsumed deferred in error state, make sure
you're using `catch`". The error is a normal crawler error with the same
info as other errors that have been caught so I cannot understand how it is
not caught? I presume that it is an application error however I would like
some advice as to how this might happen for some errors and not others when
the Exceptions are the same?

[Zach Tellman]

Hey David,

The "unconsumed deferred" error is because when GC is run, there's a
deferred value in an error state that was never looked at. These logging
deferred values are more expensive in GC than normal ones, so only 1 in
1000 will do this sort of logging (i.e. this is happening more often than
your logs would indicate). I can't help more without some code to look at.

Zach

Post by David Smith
I have a crawler that has a deferred/catch block. This block works as I
can see from the logs that I get the error reporting I want from the
exception that I expect. However we have noticed that we get some warnings
every now and again of "unconsumed deferred in error state, make sure
you're using `catch`". The error is a normal crawler error with the same
info as other errors that have been caught so I cannot understand how it is
not caught? I presume that it is an application error however I would like
some advice as to how this might happen for some errors and not others when
the Exceptions are the same?
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