Obsolete:MySQL 5.1 (fork)

This is documentation for 5.1-wm build that is still running on db24 and db30, new builds are based off facebook tree

Currently new fork is being rolled out, based on lp:mysql-server/5.1 tree - with storage engine changes going into innodb_plugin engine.

Included Percona patches (from http://bazaar.launchpad.net/~percona-dev/percona-xtradb/extensions-1.0/files):

• InnoDB-based replication positions
• Multiple purge threads
• Recovery performance: flushlist
• LRU contention fixes

Domas' changes:

• Online settable checksums calculation
• Replication fixes (for 4.0-5.1 replication) (see http://mituzas.lt/2009/12/05/on-replication-compatibility/ )
• Replication performance: hash building (see http://mituzas.lt/2009/12/08/crash-recovery-again/ )
• Reordered INNODB STATUS with serious stuff at the top, increased output size
• Removed some deprecation warnings

Wikimedia build params:

./configure --without-query-cache --without-geometry --with-plugins=innodb_plugin,blackhole \
     --enable-assembler --with-charset=binary --with-extra-charsets=all --with-server-suffix=-wm \
     --with-pstack --with-fast-mutexes --with-comment="Wikimedia Testing" --prefix=/usr/local/mysql-5.1-wm/ \
     CFLAGS="-g -O3 -fno-omit-frame-pointer" CXXFLAGS="-g -O3 -fno-omit-frame-pointer" \
     LDFLAGS="-fno-omit-frame-pointer"