[PATCH 03/12] alter: move dictionary update from ModifySpace::alter_def to alter
Vladimir Davydov
vdavydov.dev at gmail.com
Sat Apr 7 16:38:00 MSK 2018
We may yield while rebuilding a vinyl index hence we must not modify
the old space before we are done building all indexes, otherwise the
user might see an inconsistent state while a space is being altered.
Currently, this requirement doesn't hold - we both modify the old space
and build the new indexes in AlterSpaceOp::alter. We need to introduce
AlterSpaceOp::prepare method that would perform all yielding operations
and forbid yielding in AlterSpaceOp::alter.
Dictionary update, which is currently done by ModifySpace::alter_def,
modifies the old space hence it should live in ModifySpace::alter.
Let's move it there.
---
src/box/alter.cc | 45 +++++++++++++++++++--------------------------
src/box/tuple_format.c | 2 --
2 files changed, 19 insertions(+), 28 deletions(-)
diff --git a/src/box/alter.cc b/src/box/alter.cc
index 0af4ac09..ec7af24b 100644
--- a/src/box/alter.cc
+++ b/src/box/alter.cc
@@ -923,17 +923,12 @@ public:
* created, it allocates new dictionary. Alter moves new
* names into an old dictionary and deletes new one.
*/
- struct tuple_dictionary *new_dict;
- /**
- * Old tuple dictionary stored to rollback in destructor,
- * if an exception had been raised after alter_def(), but
- * before alter().
- */
- struct tuple_dictionary *old_dict;
+ struct tuple_dictionary *dict;
/* New space definition. */
struct space_def *def;
virtual void alter_def(struct alter_space *alter);
- virtual void commit(struct alter_space *alter, int64_t signature);
+ virtual void alter(struct alter_space *alter);
+ virtual void rollback(struct alter_space *alter);
virtual ~ModifySpace();
};
@@ -942,15 +937,13 @@ void
ModifySpace::alter_def(struct alter_space *alter)
{
/*
- * Move new names into an old dictionary, which already is
- * referenced by existing tuple formats. New dictionary
- * object is deleted later, in destructor.
+ * Use the old dictionary for the new space, because
+ * it is already referenced by existing tuple formats.
+ * We will update it in place in ModifySpace::alter.
*/
- new_dict = def->dict;
- old_dict = alter->old_space->def->dict;
- tuple_dictionary_swap(new_dict, old_dict);
- def->dict = old_dict;
- tuple_dictionary_ref(old_dict);
+ dict = def->dict;
+ def->dict = alter->old_space->def->dict;
+ tuple_dictionary_ref(def->dict);
space_def_delete(alter->space_def);
alter->space_def = def;
@@ -959,21 +952,21 @@ ModifySpace::alter_def(struct alter_space *alter)
}
void
-ModifySpace::commit(struct alter_space *alter, int64_t signature)
+ModifySpace::alter(struct alter_space *alter)
{
- (void) alter;
- (void) signature;
- old_dict = NULL;
+ tuple_dictionary_swap(alter->new_space->def->dict, dict);
+}
+
+void
+ModifySpace::rollback(struct alter_space *alter)
+{
+ tuple_dictionary_swap(alter->new_space->def->dict, dict);
}
ModifySpace::~ModifySpace()
{
- if (new_dict != NULL) {
- /* Return old names into the old dict. */
- if (old_dict != NULL)
- tuple_dictionary_swap(new_dict, old_dict);
- tuple_dictionary_unref(new_dict);
- }
+ if (dict != NULL)
+ tuple_dictionary_unref(dict);
if (def != NULL)
space_def_delete(def);
}
diff --git a/src/box/tuple_format.c b/src/box/tuple_format.c
index d3a7702d..11481473 100644
--- a/src/box/tuple_format.c
+++ b/src/box/tuple_format.c
@@ -262,8 +262,6 @@ tuple_format_new(struct tuple_format_vtab *vtab, struct key_def * const *keys,
const struct field_def *space_fields,
uint32_t space_field_count, struct tuple_dictionary *dict)
{
- assert((dict == NULL && space_field_count == 0) ||
- (dict != NULL && space_field_count == dict->name_count));
struct tuple_format *format =
tuple_format_alloc(keys, key_count, space_field_count, dict);
if (format == NULL)
--
2.11.0
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