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MXS-1536: Always recreate TABLE_MAP objects

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When a table map event is read after an alter table, the old TABLE_MAP
object contains old information. Due to this, as well as the added benefit
of making the code easier to read, the recycling of TABLE_MAP objects was
removed. In practice, there were no benefits to re-mapping the tables to a
different ID.
This commit is contained in:
Markus Mäkelä
2017-11-30 00:01:14 +02:00
parent 38d5bc5679
commit 7c2a173a17
4 changed files with 59 additions and 80 deletions
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2
server/modules/routing/avrorouter/avro_file.c
View File

@ -971,6 +971,8 @@ bool save_and_replace_table_create(AVRO_INSTANCE *router, TABLE_CREATE *created)
{
if (strcmp(key, table_ident) == 0)
{
TABLE_MAP* map = hashtable_fetch(router->table_maps, key);
router->active_maps[map->id % MAX_MAPPED_TABLES] = NULL;
hashtable_delete(router->table_maps, key);
}
}

30
server/modules/routing/avrorouter/avro_rbr.c
View File

@ -88,13 +88,8 @@ bool handle_table_map_event(AVRO_INSTANCE *router, REP_HEADER *hdr, uint8_t *ptr
{
ss_dassert(create->columns > 0);
TABLE_MAP *old = hashtable_fetch(router->table_maps, table_ident);
if (old == NULL || old->version != create->version)
{
TABLE_MAP *map = table_map_alloc(ptr, ev_len, create);
if (map)
{
MXS_ABORT_IF_NULL(map); // Fatal error at this point
char* json_schema = json_new_schema_from_table(map);
if (json_schema)
@ -116,10 +111,11 @@ bool handle_table_map_event(AVRO_INSTANCE *router, REP_HEADER *hdr, uint8_t *ptr
router->active_maps[old->id % MAX_MAPPED_TABLES] = NULL;
}
hashtable_delete(router->table_maps, table_ident);
hashtable_add(router->table_maps, (void*) table_ident, map);
hashtable_add(router->table_maps, (void*)table_ident, map);
hashtable_add(router->open_tables, table_ident, avro_table);
save_avro_schema(router->avrodir, json_schema, map);
router->active_maps[map->id % MAX_MAPPED_TABLES] = map;
ss_dassert(router->active_maps[id % MAX_MAPPED_TABLES] == map);
MXS_DEBUG("Table %s mapped to %lu", table_ident, map->id);
rval = true;
@ -140,21 +136,6 @@ bool handle_table_map_event(AVRO_INSTANCE *router, REP_HEADER *hdr, uint8_t *ptr
}
}
else
{
MXS_ERROR("Failed to allocate new table map.");
}
}
else
{
router->active_maps[old->id % MAX_MAPPED_TABLES] = NULL;
table_map_remap(ptr, ev_len, old);
router->active_maps[old->id % MAX_MAPPED_TABLES] = old;
MXS_DEBUG("Table %s re-mapped to %lu", table_ident, old->id);
/** No changes in the schema */
rval = true;
}
}
else
{
MXS_WARNING("Table map event for table '%s' read before the DDL statement "
"for that table was read. Data will not be processed for this "
@ -345,8 +326,9 @@ bool handle_row_event(AVRO_INSTANCE *router, REP_HEADER *hdr, uint8_t *ptr)
}
else
{
MXS_ERROR("Row event and table map event have different column counts."
" Only full row image is currently supported.");
MXS_ERROR("Row event and table map event have different column "
"counts for table %s.%s, only full row image is currently "
"supported.", map->database, map->table);
}
}
else

34
server/modules/routing/avrorouter/avro_schema.c
View File

@ -1206,13 +1206,25 @@ bool table_create_alter(TABLE_CREATE *create, const char *sql, const char *end)
if (tok_eq(ptok, "add", plen) && tok_eq(tok, "column", len))
{
tok = get_tok(tok + len, &len, end);
char avro_token[len + 1];
make_avro_token(avro_token, tok, len);
bool is_new = true;
for (uint64_t i = 0; i < create->columns; i++)
{
if (strcmp(avro_token, create->column_names[i]) == 0)
{
is_new = false;
break;
}
}
if (is_new)
{
create->column_names = MXS_REALLOC(create->column_names, sizeof(char*) * (create->columns + 1));
create->column_types = MXS_REALLOC(create->column_types, sizeof(char*) * (create->columns + 1));
create->column_lengths = MXS_REALLOC(create->column_lengths, sizeof(int) * (create->columns + 1));
char avro_token[len + 1];
make_avro_token(avro_token, tok, len);
char field_type[200] = ""; // Enough to hold all types
int field_length = extract_type_length(tok + len, field_type);
create->column_names[create->columns] = MXS_STRDUP_A(avro_token);
@ -1220,6 +1232,7 @@ bool table_create_alter(TABLE_CREATE *create, const char *sql, const char *end)
create->column_lengths[create->columns] = field_length;
create->columns++;
updates++;
}
tok = get_next_def(tok, end);
len = 0;
}
@ -1425,20 +1438,3 @@ void table_map_free(TABLE_MAP *map)
MXS_FREE(map);
}
}
/**
* @brief Map a table to a different ID
*
* This updates the table ID that the @c TABLE_MAP object is assigned with
*
* @param ptr Pointer to the start of a table map event
* @param hdr_len Post-header length
* @param map Table map to remap
*/
void table_map_remap(uint8_t *ptr, uint8_t hdr_len, TABLE_MAP *map)
{
uint64_t table_id = 0;
size_t id_size = hdr_len == 6 ? 4 : 6;
memcpy(&table_id, ptr, id_size);
map->id = table_id;
}

1
server/modules/routing/avrorouter/avrorouter.h
View File

@ -319,7 +319,6 @@ extern char* json_new_schema_from_table(TABLE_MAP *map);
extern void save_avro_schema(const char *path, const char* schema, TABLE_MAP *map);
extern bool handle_table_map_event(AVRO_INSTANCE *router, REP_HEADER *hdr, uint8_t *ptr);
extern bool handle_row_event(AVRO_INSTANCE *router, REP_HEADER *hdr, uint8_t *ptr);
extern void table_map_remap(uint8_t *ptr, uint8_t hdr_len, TABLE_MAP *map);
enum avrorouter_file_op
{