[Tarantool-patches] [PATCH v2 2/2] vinyl: clean-up unprocessed read views in *_build_read_views()
Nikita Pettik
korablev at tarantool.org
Mon Apr 27 03:53:58 MSK 2020
On 19 Apr 17:31, Vladislav Shpilevoy wrote:
> Hi! Thanks for the patch!
>
> See 2 comments below.
>
> > diff --git a/src/box/vy_write_iterator.c b/src/box/vy_write_iterator.c
> > index 7a6a20627..910e5a062 100644
> > --- a/src/box/vy_write_iterator.c
> > +++ b/src/box/vy_write_iterator.c
> > @@ -790,8 +790,11 @@ next_lsn:
> > * statement around if this is major compaction, because
> > * there's no tuple it could overwrite.
> > */
> > - if (rc == 0 && stream->is_last_level &&
> > - stream->deferred_delete_stmt != NULL) {
> > + if (rc != 0) {
> > + for (int i = 0; i < stream->rv_count; ++i)
> > + stream->read_views[i].history = NULL;
>
> 1. Why are we sure it is safe to nullify the read view histories in
> case of a fail? Looks like they can keep tuples which should be
> unreferenced. If it would be enough to nullify them, we could
> just do the same in vy_write_iterator_stop(). But it calls
> vy_write_history_destroy() before nullification.
>
> Why is not it called here? The same question for vy_read_view_merge().
You are absolutely right. Thanks, fixed (see updated patch in v3).
> > @@ -834,6 +837,15 @@ vy_read_view_merge(struct vy_write_iterator *stream, struct tuple *hint,
> > rv->history = NULL;
> > return 0;
> > }
> > +#ifndef NDEBUG
> > + struct errinj *inj =
> > + errinj(ERRINJ_VY_READ_VIEW_MERGE_FAIL, ERRINJ_BOOL);
> > + if (inj != NULL && inj->bparam) {
> > + inj->bparam = false;
> > + diag_set(OutOfMemory, 666, "malloc", "struct vy_stmt");
> > + return -1;
> > + }
>
> 2. Indentation is too big.
Fixed.
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