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Bug #24296076 INNODB REPORTS WARNING WHILE INNODB_UNDO_LOG_TRUNCATE IS ENABLED

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PROBLEM
-------

This warning message is printed when trx_sys->rseg_history_len is greater than some
arbitrary magic number (2000000). By seeing the reproducing scenario where we keep
a read view open and do a lot of transactions on table which increases the hitsory
length it is entirely possible that trx_sys->rseg_history_len can exceed 2000000.
So this is not a bug due to corruption of history length.The warning message was
just added to test some scenario and not removed.

FIX
---

1.Print this warning message only for debug versions.
2.Modified the warning message with more detailed information.
3.Don't crash even in debug versions.

[#rb 17929 Reviewed by jimmy and satya]
This commit is contained in:
Aditya A 2017-11-17 14:46:09 +05:30
parent f06443ce5f
commit 63a540c8c3
1 changed files with 10 additions and 7 deletions
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17
storage/innobase/trx/trx0purge.c
View file

@ -1,6 +1,6 @@
/*****************************************************************************
Copyright (c) 1996, 2012, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 1996, 2017, Oracle and/or its affiliates. All Rights Reserved.
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
@ -721,6 +721,7 @@ trx_purge_rseg_get_next_history_log(
mutex_exit(&(rseg->mutex));
mtr_commit(&mtr);
#ifdef UNIV_DEBUG
mutex_enter(&kernel_mutex);
/* Add debug code to track history list corruption reported
@ -734,18 +735,20 @@ trx_purge_rseg_get_next_history_log(
if (trx_sys->rseg_history_len > 2000000) {
ut_print_timestamp(stderr);
fprintf(stderr,
" InnoDB: Warning: purge reached the"
" 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 submit it"
" to http://bugs.mysql.com\n",
" reported as %lu!."
" This can happen becasue a long"
" running transaction is withholding"
" purging of undo logs or a read"
" view is open. Please try to commit"
" the long running transaction.",
(ulong) trx_sys->rseg_history_len);
ut_ad(0);
}
mutex_exit(&kernel_mutex);
#endif
return;
}