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Commit fe0e092a authored by John Esmet's avatar John Esmet Committed by Yoni Fogel
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close[t:4714] merge 4714 to main. 

the handlerton will conditionally compile in a reader writer lock for a table share's key_file array in mysql and mariadb versions before 5.5

future versions have metadata locking at the mysql layer, so the handlerton doesn't need the key_file lock.

this change also improves the key_file locking comment and removes some old, non-useful comments that I left behind in the past.



git-svn-id: file:///svn/mysql/tokudb-engine/tokudb-engine@43721 c7de825b-a66e-492c-adef-691d508d4ae1
parent d4b586e8
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Showing with 34 additions and 25 deletions
storage/tokudb/ha_tokudb.cc
View file @ fe0e092a
......@@ -44,26 +44,51 @@ static const char *ha_tokudb_exts[] = {
NullS
};
// XXX 4530 get read or write locks on the key file array,
// so that functions not synchronized by mysql table locks
// don't race.
//
// ha_tokudb::info() does not take any table locks
// so it needs to grab a read lock. any other function writing
// to the key file array needs to grab a write lock.
// In older (< 5.5) versions of MySQL and MariaDB, it is necessary to
// use a read/write lock on the key_file array in a table share,
// because table locks do not protect the race of some thread closing
// a table and another calling ha_tokudb::info()
//
// In version 5.5 and, a higher layer "metadata lock" was introduced
// to synchronize threads that open, close, call info(), etc on tables.
// In these versions, we don't need the key_file lock
#if MYSQL_VERSION_ID < 50500
#define HA_TOKUDB_NEEDS_KEY_FILE_LOCK
#endif
static void share_key_file_lock_init(TOKUDB_SHARE * share)
{
#ifdef HA_TOKUDB_NEEDS_KEY_FILE_LOCK
my_rwlock_init(&share->key_file_lock, 0);
#endif
}
static void share_key_file_lock_destroy(TOKUDB_SHARE * share)
{
#ifdef HA_TOKUDB_NEEDS_KEY_FILE_LOCK
rwlock_destroy(&share->key_file_lock);
#endif
}
static void share_key_file_rdlock(TOKUDB_SHARE * share)
{
#ifdef HA_TOKUDB_NEEDS_KEY_FILE_LOCK
rw_rdlock(&share->key_file_lock);
#endif
}
static void share_key_file_wrlock(TOKUDB_SHARE * share)
{
#ifdef HA_TOKUDB_NEEDS_KEY_FILE_LOCK
rw_wrlock(&share->key_file_lock);
#endif
}
static void share_key_file_unlock(TOKUDB_SHARE * share)
{
#ifdef HA_TOKUDB_NEEDS_KEY_FILE_LOCK
rw_unlock(&share->key_file_lock);
#endif
}
//
......@@ -179,8 +204,7 @@ static TOKUDB_SHARE *get_share(const char *table_name, TABLE_SHARE* table_share)
}
thr_lock_init(&share->lock);
pthread_mutex_init(&share->mutex, MY_MUTEX_INIT_FAST);
// XXX 4530 initialize the key file lock
my_rwlock_init(&share->key_file_lock, 0);
share_key_file_lock_init(share);
my_rwlock_init(&share->num_DBs_lock, 0);
}
......@@ -250,6 +274,7 @@ static int free_share(TOKUDB_SHARE * share, bool mutex_is_locked) {
my_hash_delete(&tokudb_open_tables, (uchar *) share);
thr_lock_delete(&share->lock);
pthread_mutex_destroy(&share->mutex);
share_key_file_lock_destroy(share);
rwlock_destroy(&share->num_DBs_lock);
my_free((uchar *) share, MYF(0));
}
......@@ -5650,7 +5675,6 @@ int ha_tokudb::info(uint flag) {
error = db_env->txn_begin(db_env, NULL, &txn, DB_READ_UNCOMMITTED);
if (error) { goto cleanup; }
// XXX 4530 lock the key file lock for reading
share_key_file_rdlock(share);
key_file_lock_taken = true;
// we should always have a primary key
......@@ -5753,7 +5777,6 @@ int ha_tokudb::info(uint flag) {
}
error = 0;
cleanup:
// XXX 4530 unlock the key file lock if it was taken
if (key_file_lock_taken) {
share_key_file_unlock(share);
}
......@@ -7851,7 +7874,6 @@ int ha_tokudb::drop_indexes(TABLE *table_arg, uint *key_num, uint num_of_keys, D
TOKUDB_DBUG_ENTER("ha_tokudb::drop_indexes");
while (ha_tokudb_drop_indexes_wait) sleep(1); // debug
// XXX 4530 lock the key file lock for writing.
share_key_file_wrlock(share);
int error = 0;
......@@ -7881,7 +7903,6 @@ cleanup:
another transaction has accessed the table. \
To drop indexes, make sure no transactions touch the table.", share->table_name);
}
// XXX 4530 unlock the key file lock
share_key_file_unlock(share);
TOKUDB_DBUG_RETURN(error);
}
......@@ -7891,7 +7912,6 @@ To drop indexes, make sure no transactions touch the table.", share->table_name)
// Restores dropped indexes in case of error in error path of prepare_drop_index and alter_table_phase2
//
void ha_tokudb::restore_drop_indexes(TABLE *table_arg, uint *key_num, uint num_of_keys) {
// XXX 4530 lock the key file lock for writing
share_key_file_wrlock(share);
//
......@@ -7911,7 +7931,6 @@ void ha_tokudb::restore_drop_indexes(TABLE *table_arg, uint *key_num, uint num_o
assert(!r);
}
}
// XXX 4530 unlock the key file lock
share_key_file_unlock(share);
}
......@@ -8203,7 +8222,6 @@ int ha_tokudb::delete_all_rows_internal() {
uint curr_num_DBs = 0;
DB_TXN* txn = NULL;
// XXX 4530 lock the key file array for writing
share_key_file_wrlock(share);
error = db_env->txn_begin(db_env, 0, &txn, 0);
......@@ -8274,7 +8292,6 @@ cleanup:
}
}
}
// XXX 4530 unlock the key file lock
share_key_file_unlock(share);
TOKUDB_DBUG_RETURN(error);
}
......
storage/tokudb/ha_tokudb.h
View file @ fe0e092a
......@@ -413,7 +413,6 @@ private:
int is_index_unique(bool* is_unique, DB_TXN* txn, DB* db, KEY* key_info);
int is_val_unique(bool* is_unique, uchar* record, KEY* key_info, uint dict_index, DB_TXN* txn);
int do_uniqueness_checks(uchar* record, DB_TXN* txn, THD* thd);
// XXX 3414 remove last parameter
void set_main_dict_put_flags(THD* thd, bool opt_eligible, u_int32_t* put_flags);
int insert_row_to_main_dictionary(uchar* record, DBT* pk_key, DBT* pk_val, DB_TXN* txn);
int insert_rows_to_dictionaries_mult(DBT* pk_key, DBT* pk_val, DB_TXN* txn, THD* thd);
......
storage/tokudb/hatoku_hton.cc
View file @ fe0e092a
......@@ -1574,16 +1574,9 @@ static struct st_mysql_sys_var *tokudb_system_variables[] = {
MYSQL_SYSVAR(log_dir),
MYSQL_SYSVAR(debug),
MYSQL_SYSVAR(commit_sync),
// XXX: implmement a new mysql system variable in our handlerton
// called tokudb_lock_timeout. this variable defines the maximum
// time that threads will wait for a lock to be acquired
MYSQL_SYSVAR(lock_timeout),
MYSQL_SYSVAR(cleaner_period),
MYSQL_SYSVAR(cleaner_iterations),
// XXX remove the old tokudb_read_lock_wait session variable
// XXX remove the old tokudb_write_lock_wait session variable
MYSQL_SYSVAR(pk_insert_mode),
MYSQL_SYSVAR(load_save_space),
MYSQL_SYSVAR(disable_slow_alter),
......
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