diff options
Diffstat (limited to 'innobase/trx/trx0purge.c')
| -rw-r--r-- | innobase/trx/trx0purge.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/innobase/trx/trx0purge.c b/innobase/trx/trx0purge.c index 5c62640e011..3df34111281 100644 --- a/innobase/trx/trx0purge.c +++ b/innobase/trx/trx0purge.c @@ -289,7 +289,7 @@ trx_purge_add_update_undo_to_history( flst_get_len(seg_header + TRX_UNDO_PAGE_LIST, mtr)); mlog_write_ulint(rseg_header + TRX_RSEG_HISTORY_SIZE, - hist_size + undo->size, MLOG_4BYTES, mtr); + hist_size + undo->size, MLOG_4BYTES, mtr); } /* Add the log as the first in the history list */ @@ -646,6 +646,27 @@ trx_purge_rseg_get_next_history_log( mutex_exit(&(rseg->mutex)); mtr_commit(&mtr); + mutex_enter(&kernel_mutex); + + /* Add debug code to track history list corruption reported + on the MySQL mailing list on Nov 9, 2004. The fut0lst.c + file-based list was corrupt. The prev node pointer was + FIL_NULL, even though the list length was over 8 million nodes! + We assume that purge truncates the history list in moderate + size pieces, and if we here reach the head of the list, the + list cannot be longer than 20 000 undo logs now. */ + + if (trx_sys->rseg_history_len > 20000) { + ut_print_timestamp(stderr); + fprintf(stderr, +" InnoDB: Warning: purge reached the head of the history list,\n" +"InnoDB: but its length is still reported as %lu! Make a detailed bug\n" +"InnoDB: report, and post it to bugs.mysql.com\n", + (ulong)trx_sys->rseg_history_len); + } + + mutex_exit(&kernel_mutex); + return; } |