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An immutable weak reference is a hole in the constraint system: if
referenced rows are deleted, then the weak reference needs to change.
Therefore, force columsn that contain weak references to be mutable.
Reported-by: "Elluru, Krishna Mohan" <elluru.kri.mohan@hpe.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>
Acked-by: Ryan Moats <rmoats@us.ibm.com>
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When a strong reference to a non-root table is ephemeral, the database log
can contain inconsistencies. In particular, if the column in question is
the only reference to a row, then the row will be created in one logged
transaction but the reference to it will not be logged (because it is
ephemeral). Thus, any later occurrence of the row later in the log (to
modify it, to delete it, or just to reference it) will yield a transaction
error and reading the database will abort at that point.
This commit fixes the problem by forcing any column with a strong reference
to a non-root table to be persistent.
The change to ovsdb_schema_from_json() looks bigger than it really is: it
just swaps the order of two operations on the schema and updates their
comments. Similarly for the update to ovs.db.DbSchema.__init__().
Bug #5144.
Reported-by: Sujatha Sumanth <ssumanth@nicira.com>
Bug #5149.
Reported-by: Ram Jothikumar <rjothikumar@nicira.com>
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As the database schema evolves, it might be useful to have an identifier
for the particular version in use. This commit adds that feature.
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These initial bindings pass a few hundred of the corresponding tests
for C implementations of various bits of the Open vSwitch library API.
The poorest part of them is actually the Python IDL interface in
ovs.db.idl, which has not received enough attention yet. It appears
to work, but it doesn't yet support writes (transactions) and it is
difficult to use. I hope to improve it as it becomes clear what
semantics Python applications actually want from an IDL.
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