diff options
Diffstat (limited to 'storage/maria/ma_state.c')
| -rw-r--r-- | storage/maria/ma_state.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/storage/maria/ma_state.c b/storage/maria/ma_state.c index 785f1689a37..a4b002dec64 100644 --- a/storage/maria/ma_state.c +++ b/storage/maria/ma_state.c @@ -366,6 +366,15 @@ my_bool _ma_check_status(void *param) /** @brief write hook at end of trans to store status for all used table + + @Notes + This function must be called under trnman_lock in trnman_end_trn() + because of the following reasons: + - After trnman_end_trn() is called, the current transaction will be + regarded as committed and all used tables state_history will be + visible to other transactions. To do this, we loop over all used + tables and create/update a history entries that contains the correct + state_history for them. */ my_bool _ma_trnman_end_trans_hook(TRN *trn, my_bool commit, @@ -390,6 +399,13 @@ my_bool _ma_trnman_end_trans_hook(TRN *trn, my_bool commit, trnman_exists_active_transactions(share->state_history->trid, trn->commit_trid, 1)) { + /* + There exist transactions that are still using the current + share->state_history. Create a new history item for this + commit and add it first in the state_history list. This + ensures that all history items are stored in the list in + decresing trid order. + */ if (!(history= my_malloc(sizeof(*history), MYF(MY_WME)))) { /* purecov: begin inspected */ |