[tarantool-patches] [PATCH 05/12] vinyl: do not reallocate tuple formats on alter
Vladimir Davydov
vdavydov.dev at gmail.com
Sun Apr 1 14:24:18 MSK 2018
On Sun, Apr 01, 2018 at 02:12:26PM +0300, v.shpilevoy at tarantool.org wrote:
> > diff --git a/src/box/vinyl.c b/src/box/vinyl.c
> > index fc37283a..f3cef52f 100644
> > --- a/src/box/vinyl.c
> > +++ b/src/box/vinyl.c
> > +static void
> > +vinyl_space_swap_index(struct space *old_space, struct space *new_space,
> > + uint32_t old_index_id, uint32_t new_index_id)
> > +{
> > + struct vy_lsm *old_lsm = vy_lsm(old_space->index_map[old_index_id]);
> > + struct vy_lsm *new_lsm = vy_lsm(new_space->index_map[new_index_id]);
> > +
> > + /*
> > + * Swap the two indexes between the two spaces,
> > + * but leave tuple formats.
> > + */
> > + generic_space_swap_index(old_space, new_space,
> > + old_index_id, new_index_id);
> > +
> > + SWAP(old_lsm->mem_format, new_lsm->mem_format);
>
> How do you swap the formats, if they are variable length structures?
> 1) Their fields[] arrays are not swapped here, 2) even if you will try
> to swap - they can have different length.
I swap pointers, not objects:
struct vy_lsm {
...
struct tuple_format *disk_format;
struct tuple_format *mem_format;
struct tuple_format *mem_format_with_colmask;
};
>
> > + SWAP(old_lsm->mem_format_with_colmask,
> > + new_lsm->mem_format_with_colmask);
> > + SWAP(old_lsm->disk_format, new_lsm->disk_format);
> > + SWAP(old_lsm->opts, new_lsm->opts);
> > }
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