all data everywhere
DESCRIPTION
MySQL's replication system has been a core feature often touted for scaling (sort of) and redundancy (sort of). I'll describe a client's extensive use of MySQL replication (they have more than 200 MySQL instances replicating to one another) as a reference for the many uses and misuses of replication.TRANSCRIPT
MySQL replication
(all data everywhere; is it a good idea?)
sarah novotny –[email protected] MySQL and LAMP services
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①master/slave②master/relay slave/slave③active/passive multi-master④active/active multi-master⑤rings⑥rings + reporting spurs + hot
standbys + relay slaves + read slaves, oh my
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①master/slave
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READ ONLY
② Master/relay slave/slave
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READ ONLY
READ ONLY
③active/passive multi-master
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READ ONLY
③active/passive multi-master
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READ ONLY
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④active/active multi-master
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read/writeread/write
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And now we come to rings
⑤rings
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read/write read/write
read/writeread/write
⑥ oh, my
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⑥ oh, my
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Boston ->
London ->
DC ->
Seattle ->
⑥ oh, my
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Boston ->
London ->
DC ->
Seattle ->
⑥ oh, my
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n
n application servers
writable ring
readable spokes
⑥ oh, my
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n application servers
writable ring
readable spokes
⑥oh, my
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⑦challenges⑧good things⑨why 5.0 still⑩tools
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⑦challenges
when things go wrong, they go very, very wrong
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⑦challenges
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datadrift
⑦challenges
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application servers in one datacenter may have different data than anotherfor some amount of time
⑦challenges
scaling writes
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⑧good things
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never a dullmoment
⑧good things
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nearly infiniteread scaling
⑧good things
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4 (usually) identical copies of data
⑧why 5.0 still?
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replicationbugs
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⑧why 5.0 still?
tools we use to managethis insanity—
InnotopmaatkitMySQL proxycacti templatesnagios
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credits
flickr• icons – timothymorgan• MySQL mints – jimwinstead• license plate – severud• vodka – masochismtango• 1 – sarahajohnson• arthur – sierratierra• drift – jarylcabuco• dull -- pagedooley• tools – meanestindian
other
• special thanks to unnamed staff from my unnamed client for suggestions on content and slides
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flickr• sadface – mlostracco• quadruplets – evilerin• reading – stevecadman• bugs -- bruneskine
Blue Gecko and contact info
• [email protected]• [email protected]• @sarahnovotny• @bluegecko• senk on #mysql
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