[debian-mysql] Bug#561999: mysql-server-5.0: "flush logs" corrupts mysql-bin.index
Andrew Pimlott
andrew at pimlott.net
Mon Dec 21 21:45:12 UTC 2009
Package: mysql-server-5.0
Version: 5.0.51a-24+lenny2
Severity: normal
I have uncommented the log_bin setting in /etc/mysql/my.cnf in order to
to make my server a replication master. This has been working fine, but
one day I executed "flush logs", and the slave started throwing errors:
Dec 21 20:31:46 web3 mysqld.replica[23069]: 091221 20:31:46 [ERROR] Error reading packet from server: File '.000007' not found (Errcode: 2) ( server_errno=29)
Dec 21 20:31:46 web3 mysqld.replica[23069]: 091221 20:31:46 [Note] Slave I/O thread: Failed reading log event, reconnecting to retry, log 'mysql-bin.000007' position 4
Dec 21 20:31:46 web3 mysqld.replica[23069]: 091221 20:31:46 [Note] Slave: connected to master 'repl at db1:3306',replication resumed in log 'mysql-bin.000007' at position 4
Dec 21 20:31:46 web3 mysqld.replica[23069]: 091221 20:31:46 [ERROR] Error reading packet from server: Could not find first log file name in binary log index file ( server_errno=1236)
Dec 21 20:31:46 web3 mysqld.replica[23069]: 091221 20:31:46 [ERROR] Got fatal error 1236: 'Could not find first log file name in binary log index file' from master when reading data from binary log
Dec 21 20:31:46 web3 mysqld.replica[23069]: 091221 20:31:46 [Note] Slave I/O thread exiting, read up to log 'mysql-bin.000007', position 4
Wondering what had happened, I looked at my log directory:
% cd /var/log/mysql
% ls -l
-rw-rw---- 1 mysql adm 13813 2009-12-19 18:32 mysql-bin.000001
-rw-rw---- 1 mysql adm 117 2009-12-19 18:41 mysql-bin.000002
-rw-rw---- 1 mysql adm 117 2009-12-19 18:43 mysql-bin.000003
-rw-rw---- 1 mysql adm 1833587 2009-12-20 07:39 mysql-bin.000004
-rw-rw---- 1 mysql adm 4698347 2009-12-21 07:53 mysql-bin.000005
-rw-rw---- 1 mysql adm 8683203 2009-12-21 20:32 mysql-bin.000006
-rw-rw---- 1 mysql adm 98 2009-12-21 20:32 mysql-bin.000007
-rw-rw---- 1 mysql adm 224 2009-12-21 20:32 mysql-bin.index
That looks all right... but
% cat mysql-bin.index
/var/log/mysql/mysql-bin.000001
/var/log/mysql/mysql-bin.000002
/var/log/mysql/mysql-bin.000003
/var/log/mysql/mysql-bin.000004
/var/log/mysql/mysql-bin.000005
/var/log/var/log/mysql/mysql-bin.000007
This really looks bad. First, mysql-bin.000006 has disappeared, and
second, the path to mysql-bin.000007 is wrong.
I have not been able to reproduce this problem, but since it is fairly
serious I thought I should report it.
I think I managed to recover from this without stopping the database. I
edited the mysql-bin.index file to fix it, then I issued another "flush
logs". Now, mysql-bin.index has files 1-8 as expected, and I can resume
the replication successfully.
Andrew
#
# The MySQL database server configuration file.
#
# You can copy this to one of:
# - "/etc/mysql/my.cnf" to set global options,
# - "~/.my.cnf" to set user-specific options.
#
# One can use all long options that the program supports.
# Run program with --help to get a list of available options and with
# --print-defaults to see which it would actually understand and use.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html
# This will be passed to all mysql clients
# It has been reported that passwords should be enclosed with ticks/quotes
# escpecially if they contain "#" chars...
# Remember to edit /etc/mysql/debian.cnf when changing the socket location.
[client]
port = 3306
socket = /var/run/mysqld/mysqld.sock
# Here is entries for some specific programs
# The following values assume you have at least 32M ram
# This was formally known as [safe_mysqld]. Both versions are currently parsed.
[mysqld_safe]
socket = /var/run/mysqld/mysqld.sock
nice = 0
[mysqld]
#
# * Basic Settings
#
user = mysql
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
port = 3306
basedir = /usr
datadir = /var/lib/mysql
tmpdir = /tmp
language = /usr/share/mysql/english
skip-external-locking
#
# Instead of skip-networking the default is now to listen only on
# localhost which is more compatible and is not less secure.
#bind-address = 127.0.0.1
#
# * Fine Tuning
#
key_buffer = 16M
max_allowed_packet = 16M
thread_stack = 128K
thread_cache_size = 8
# This replaces the startup script and checks MyISAM tables if needed
# the first time they are touched
myisam-recover = BACKUP
#max_connections = 100
#table_cache = 64
#thread_concurrency = 10
#
# * Query Cache Configuration
#
query_cache_limit = 1M
query_cache_size = 16M
#
# * Logging and Replication
#
# Both location gets rotated by the cronjob.
# Be aware that this log type is a performance killer.
#log = /var/log/mysql/mysql.log
#
# Error logging goes to syslog. This is a Debian improvement :)
#
# Here you can see queries with especially long duration
#log_slow_queries = /var/log/mysql/mysql-slow.log
#long_query_time = 2
#log-queries-not-using-indexes
#
# The following can be used as easy to replay backup logs or for replication.
# note: if you are setting up a replication slave, see README.Debian about
# other settings you may need to change.
server-id = 1
log_bin = /var/log/mysql/mysql-bin.log
sync_binlog = 1
expire_logs_days = 10
max_binlog_size = 100M
#binlog_do_db = include_database_name
#binlog_ignore_db = include_database_name
#
# * BerkeleyDB
#
# Using BerkeleyDB is now discouraged as its support will cease in 5.1.12.
skip-bdb
#
# * InnoDB
#
# InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/.
# Read the manual for more InnoDB related options. There are many!
# You might want to disable InnoDB to shrink the mysqld process by circa 100MB.
#skip-innodb
#
# * Security Features
#
# Read the manual, too, if you want chroot!
# chroot = /var/lib/mysql/
#
# For generating SSL certificates I recommend the OpenSSL GUI "tinyca".
#
# ssl-ca=/etc/mysql/cacert.pem
# ssl-cert=/etc/mysql/server-cert.pem
# ssl-key=/etc/mysql/server-key.pem
[mysqldump]
quick
quote-names
max_allowed_packet = 16M
[mysql]
#no-auto-rehash # faster start of mysql but no tab completition
[isamchk]
key_buffer = 16M
#
# * NDB Cluster
#
# See /usr/share/doc/mysql-server-*/README.Debian for more information.
#
# The following configuration is read by the NDB Data Nodes (ndbd processes)
# not from the NDB Management Nodes (ndb_mgmd processes).
#
# [MYSQL_CLUSTER]
# ndb-connectstring=127.0.0.1
#
# * IMPORTANT: Additional settings that can override those from this file!
# The files must end with '.cnf', otherwise they'll be ignored.
#
!includedir /etc/mysql/conf.d/
-- System Information:
Debian Release: 5.0.3
APT prefers stable
APT policy: (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.31-302-rs (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages mysql-server-5.0 depends on:
ii adduser 3.110 add and remove users and groups
ii debconf [debconf-2.0] 1.5.24 Debian configuration management sy
ii libc6 2.7-18 GNU C Library: Shared libraries
ii libdbi-perl 1.605-1 Perl5 database interface by Tim Bu
ii libgcc1 1:4.3.2-1.1 GCC support library
ii libmysqlclient15off 5.0.51a-24+lenny2 MySQL database client library
ii libncurses5 5.7+20081213-1 shared libraries for terminal hand
ii libreadline5 5.2-3.1 GNU readline and history libraries
ii libstdc++6 4.3.2-1.1 The GNU Standard C++ Library v3
ii libwrap0 7.6.q-16 Wietse Venema's TCP wrappers libra
ii lsb-base 3.2-20 Linux Standard Base 3.2 init scrip
ii mysql-client-5.0 5.0.51a-24+lenny2 MySQL database client binaries
ii mysql-common 5.0.51a-24+lenny2 MySQL database common files
ii passwd 1:4.1.1-6 change and administer password and
ii perl 5.10.0-19lenny2 Larry Wall's Practical Extraction
ii psmisc 22.6-1 Utilities that use the proc filesy
ii zlib1g 1:1.2.3.3.dfsg-12 compression library - runtime
Versions of packages mysql-server-5.0 recommends:
ii heirloom-mailx [mailx 12.3+cvs20080629-1 feature-rich BSD mail(1)
pn libhtml-template-perl <none> (no description available)
Versions of packages mysql-server-5.0 suggests:
pn tinyca <none> (no description available)
-- debconf information:
mysql-server-5.0/really_downgrade: false
mysql-server-5.0/need_sarge_compat: false
mysql-server-5.0/start_on_boot: true
mysql-server/error_setting_password:
mysql-server-5.0/nis_warning:
mysql-server-5.0/postrm_remove_databases: false
mysql-server/password_mismatch:
mysql-server-5.0/need_sarge_compat_done: true
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