diff options
| -rw-r--r-- | storage/innobase/include/trx0sys.ic | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/storage/innobase/include/trx0sys.ic b/storage/innobase/include/trx0sys.ic index e8efc1525c4..5271601b4ea 100644 --- a/storage/innobase/include/trx0sys.ic +++ b/storage/innobase/include/trx0sys.ic @@ -1,6 +1,7 @@ /***************************************************************************** Copyright (c) 1996, 2015, Oracle and/or its affiliates. All Rights Reserved. +Copyright (c) 2017, MariaDB Corporation. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software @@ -343,6 +344,15 @@ trx_rw_is_active( bool do_ref_count) /*!< in: if true then increment the trx_t::n_ref_count */ { + if (!trx_id) { + /* In MariaDB 10.3, purge will reset DB_TRX_ID to 0 + when the history is lost. Read/write transactions will + always have a nonzero trx_t::id; there the value 0 is + reserved for transactions that did not write or lock + anything yet. */ + return NULL; + } + trx_t* trx; trx_sys_mutex_enter(); |