There are additional possible causes of incremental update problems that
I haven't previously seen mentioned here. If you look at the functions
that implement incremental update, they tend to start with:
if (!ctx->ovnsb_idl_txn) {
return NULL;
}
or similar. This makes sense, because there is no point in composing an
update if it can't be committed. However, because the main loop call
ovsdb_idl_txn_clear() on every iteration, that means that any updates
from this iteration will be lost.
Also, transactions can fail. In that case, the transaction needs to be
recomposed and retried. ovn-controller currently doesn't have any
mechanism for that.
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