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# Error handling
Gloo defines two groups of exceptions for raising errors: recoverable errors and
assertions.
## Recoverable errors
Gloo throws exceptions for potentially recoverable errors. The most common
examples include IO errors, where a connected machine or network link is
in a bad state, but the local machine is operational. The caller, with
appropriate context, may be able to recover or reconfigure the machine pool.
For `::gloo::IoException` specifically, the caller should assume the
transport layer is in an unknown state and recreate the transport
[pairs](../gloo/transport/pair.h) or containing collective algorithm instance.
Exceptions are defined in [`error.h`](../gloo/common/error.h) and should
extend `::gloo::Exception`.
## Assertions
Gloo asserts unexpected errors and logical invariants instead of expecting
callers to handle them. `GLOO_ENFORCE` macros are defined in
[`logging.h`](../gloo/common/logging.h)
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