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b9f5793176
Two new variables added: - max_tmp_space_usage : Limits the the temporary space allowance per user - max_total_tmp_space_usage: Limits the temporary space allowance for all users. New status variables: tmp_space_used & max_tmp_space_used New field in information_schema.process_list: TMP_SPACE_USED The temporary space is counted for: - All SQL level temporary files. This includes files for filesort, transaction temporary space, analyze, binlog_stmt_cache etc. It does not include engine internal temporary files used for repair, alter table, index pre sorting etc. - All internal on disk temporary tables created as part of resolving a SELECT, multi-source update etc. Special cases: - When doing a commit, the last flush of the binlog_stmt_cache will not cause an error even if the temporary space limit is exceeded. This is to avoid giving errors on commit. This means that a user can temporary go over the limit with up to binlog_stmt_cache_size. Noteworthy issue: - One has to be careful when using small values for max_tmp_space_limit together with binary logging and with non transactional tables. If a the binary log entry for the query is bigger than binlog_stmt_cache_size and one hits the limit of max_tmp_space_limit when flushing the entry to disk, the query will abort and the binary log will not contain the last changes to the table. This will also stop the slave! This is also true for all Aria tables as Aria cannot do rollback (except in case of crashes)! One way to avoid it is to use @@binlog_format=statement for queries that updates a lot of rows. Implementation: - All writes to temporary files or internal temporary tables, that increases the file size, are routed through temp_file_size_cb_func() which updates and checks the temp space usage. - Most of the temporary file monitoring is done inside IO_CACHE. Temporary file monitoring is done inside the Aria engine. - MY_TRACK and MY_TRACK_WITH_LIMIT are new flags for ini_io_cache(). MY_TRACK means that we track the file usage. TRACK_WITH_LIMIT means that we track the file usage and we give an error if the limit is breached. This is used to not give an error on commit when binlog_stmp_cache is flushed. - global_tmp_space_used contains the total tmp space used so far. This is needed quickly check against max_total_tmp_space_usage. - Temporary space errors are using EE_LOCAL_TMP_SPACE_FULL and handler errors are using HA_ERR_LOCAL_TMP_SPACE_FULL. This is needed until we move general errors to it's own error space so that they cannot conflict with system error numbers. - Return value of my_chsize() and mysql_file_chsize() has changed so that -1 is returned in the case my_chsize() could not decrease the file size (very unlikely and will not happen on modern systems). All calls to _chsize() are updated to check for > 0 as the error condition. - At the destruction of THD we check that THD::tmp_file_space == 0 - At server end we check that global_tmp_space_used == 0 - As a precaution against errors in the tmp_space_used code, one can set max_tmp_space_usage and max_total_tmp_space_usage to 0 to disable the tmp space quota errors. - truncate_io_cache() function added. - Aria tables using static or dynamic row length are registered in 8K increments to avoid some calls to update_tmp_file_size(). Other things: - Ensure that all handler errors are registered. Before, some engine errors could be printed as "Unknown error". - Fixed bug in filesort() that causes a assert if there was an error when writing to the temporay file. - Fixed that compute_window_func() now takes into account write errors. - In case of parallel replication, rpl_group_info::cleanup_context() could call trans_rollback() with thd->error set, which would cause an assert. Fixed by resetting the error before calling trans_rollback(). - Fixed bug in subselect3.inc which caused following test to use heap tables with low value for max_heap_table_size - Fixed bug in sql_expression_cache where it did not overflow heap table to Aria table. - Added Max_tmp_disk_space_used to slow query log. - Fixed some bugs in log_slow_innodb.test
104 lines
2.9 KiB
C
104 lines
2.9 KiB
C
/* Copyright (c) 2000-2007 MySQL AB, 2009 Sun Microsystems, Inc.
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Use is subject to license terms.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
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#include "mysys_priv.h"
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#include "mysys_err.h"
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#include "m_string.h"
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/*
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Change size of file.
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SYNOPSIS
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my_chsize()
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fd File descriptor
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new_length New file size
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filler If we don't have truncate, fill up all bytes after
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new_length with this character
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MyFlags Flags
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DESCRIPTION
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my_chsize() truncates file if shorter else fill with the filler character.
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The function also changes the file pointer. Usually it points to the end
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of the file after execution.
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RETURN VALUE
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0 Ok
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-1 OS does not support truncate. Filled space with 0
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1 Error
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*/
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int my_chsize(File fd, my_off_t newlength, int filler, myf MyFlags)
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{
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my_off_t oldsize;
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uchar buff[IO_SIZE];
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int res= 0;
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DBUG_ENTER("my_chsize");
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DBUG_PRINT("my",("fd: %d length: %lu MyFlags: %lu",fd,(ulong) newlength,
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MyFlags));
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if ((oldsize= my_seek(fd, 0L, MY_SEEK_END, MYF(MY_WME+MY_FAE))) == newlength)
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DBUG_RETURN(0);
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DBUG_PRINT("info",("old_size: %ld", (ulong) oldsize));
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if (oldsize > newlength)
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{
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#ifdef _WIN32
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if (my_win_chsize(fd, newlength))
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{
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my_errno= errno;
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goto err;
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}
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DBUG_RETURN(0);
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#elif defined(HAVE_FTRUNCATE)
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if (ftruncate(fd, (off_t) newlength))
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{
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my_errno= errno;
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goto err;
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}
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DBUG_RETURN(0);
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#else
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/*
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Fill space between requested length and true length with 'filler'
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We should never come here on any modern machine
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*/
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if (my_seek(fd, newlength, MY_SEEK_SET, MYF(MY_WME+MY_FAE))
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== MY_FILEPOS_ERROR)
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{
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goto err;
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}
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res= -1; /* Warn that file was zerofilled, not truncated */
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swap_variables(my_off_t, newlength, oldsize);
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#endif
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}
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/* Full file with 'filler' until it's as big as requested */
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bfill(buff, IO_SIZE, filler);
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while (newlength-oldsize > IO_SIZE)
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{
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if (my_write(fd, buff, IO_SIZE, MYF(MY_NABP)))
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goto err;
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oldsize+= IO_SIZE;
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}
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if (my_write(fd,buff,(size_t) (newlength-oldsize), MYF(MY_NABP)))
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goto err;
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DBUG_RETURN(res);
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err:
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DBUG_PRINT("error", ("errno: %d", errno));
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if (MyFlags & MY_WME)
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my_error(EE_CANT_CHSIZE, MYF(ME_BELL), my_errno);
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DBUG_RETURN(1);
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} /* my_chsize */
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