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| author | Marko Mäkelä <marko.makela@mariadb.com> | 2022-05-25 14:06:04 +0300 |
|---|---|---|
| committer | Marko Mäkelä <marko.makela@mariadb.com> | 2022-05-25 14:06:04 +0300 |
| commit | 99c8aed00d832d838ee4b746dc6ae18a8f281709 (patch) | |
| tree | 3c0834f03e64bf0418f7bc584713b1ccd3ac8650 /storage/innobase/lock | |
| parent | c1d380aa883f9326f24eb2faf3f2d5dba43d9c85 (diff) | |
| download | mariadb-git-99c8aed00d832d838ee4b746dc6ae18a8f281709.tar.gz | |
MDEV-28601 InnoDB history list length was reverted to 32 bits
srv_do_purge(): In commit edde1f6e0d5f5a0115a5253c9b8d428af132f2d1
when the de-facto 32-bit trx_sys_t::history_size() was replaced with
32-bit trx_sys.rseg_history_len, some more variables were changed
from ulint (size_t) to uint32_t.
The history list length is the number of committed transactions whose
undo logs are waiting to be purged. Each TRX_RSEG_HISTORY list is
storing the number of entries in a 32-bit field and each transaction
will occupy at least one undo log page. It is thinkable that the
length of each TRX_RSEG_HISTORY list may approach the maximum
representable number. The number cannot be exceeded, because the
rollback segment header is allocated from the same tablespace as
the undo log header pages it is pointing to, and because the page
numbers of a tablespace are stored in 32 bits. In any case, it is
possible that the total number of unpurged committed transactions
cannot be represented in 32 but 39 bits (corresponding to
128 rollback segments and undo tablespaces).
Diffstat (limited to 'storage/innobase/lock')
| -rw-r--r-- | storage/innobase/lock/lock0lock.cc | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/storage/innobase/lock/lock0lock.cc b/storage/innobase/lock/lock0lock.cc index 01a31b41662..a5ac7de0a92 100644 --- a/storage/innobase/lock/lock0lock.cc +++ b/storage/innobase/lock/lock0lock.cc @@ -4602,14 +4602,14 @@ lock_print_info_summary( fprintf(file, "Purge done for trx's n:o < " TRX_ID_FMT " undo n:o < " TRX_ID_FMT " state: %s\n" - "History list length %u\n", + "History list length %zu\n", purge_sys.tail.trx_no, purge_sys.tail.undo_no, purge_sys.enabled() ? (purge_sys.running() ? "running" : purge_sys.paused() ? "stopped" : "running but idle") : "disabled", - uint32_t{trx_sys.rseg_history_len}); + size_t{trx_sys.rseg_history_len}); #ifdef PRINT_NUM_OF_LOCK_STRUCTS fprintf(file, |