Redis -- Memory as the New Disk

memory as the new disk

☞redis tim lossen @nosqleu

“memory is the new disk, disk is the new tape” — jim gray

strengths harddisk - durability - capacity - sequential access (= “tape”) memory - random access - low latency

relative latency register 0.1 cache 1 memory 10 harddisk 1.000.000 “latency trumps all” — chris saari

ﬂickr.com/photos/36688133@N00/3655892919

berlin - london easyjet 1 hour

berlin - london f-16 6 minutes easyjet 1 hour

berlin - london f-16 6 minutes easyjet 1 hour eurostar 10 hours

berlin - london f-16 6 minutes easyjet 1 hour eurostar 10 hours broken car 114 years

ﬂickr.com/photos/64498037@N00/3107322938

redis ﬂickr.com/photos/atzu/2645776918

benchmark 4897 GET/s 5128 SET/s code.google.com/p/redis/wiki/Benchmarks

ﬂickr.com/photos/mbiddulph/3836727468

sheeva plug ﬂickr.com/photos/mbiddulph/3836727468

sheeva plug $99ﬂickr.com/photos/mbiddulph/3836727468

features data structures - integers, strings - lists, sets, hashes - channels atomic operations - get, set, increment - push, pop ...

features virtual memory - keys always in memory - values swapped in as needed durability - append-only log ﬁle - background snapshots replication

implementation - 10k lines of pure ansi c poetry - no erlang, no javascript, no xml, no map-reduce, no hash rings, no merkle trees, no paxos, no vector clocks, no gossip protocol, no auto scaling, no friggin magic

clients - redis-cli, telnet - c, c# - ruby, python, perl - java, scala - php - [many more ...]

summary - don’t cross the red line - avoid magic - redis is simple & very ﬂexible

summary - don’t cross the red line - avoid magic - redis is simple & very ﬂexible - ..... and pretty fast as well☺

thanx! ❦ @tlossen

links slideshare.net/guest22d4179/ latency-trumps-all code.google.com/p/redis github.com/antirez/redis rediscookbook.org

one-minute install > wget redis.tgz > tar xzf redis.tgz > cd redis > make > ./redis-server

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Redis -- Memory as the New Disk

by Tim Lossen

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