If
- transaction replay is enabled,
- an error is returned and
- the error is one of the recoverable Clustrix errors
we will retry the transaction.
If it succeeds, then the client will not notice anything but
for a short delay.
Note that the error message is looked for irrespective of whether
the backend is Clustrix or not. However, as errors are not common
the price for doing that can probably be ignored.
However, a bigger problem is that explicit knowledge of different
backends should *not* be coded into routers.
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