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Redis @http://weibo.com/tangfl http://fulin.org

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• Redis• Redis • • redis • redis•

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Redis• in memory (database?)• data can dump to disk• many useful data structure• FAST both read and write• we start use from 2.0, now 2.4

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=feed+ +

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=feed+ +• feed • •

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=feed+ +

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=feed+ +• • •

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=feed+ +

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=feed+ +• • • @ • @ •

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=feed+ +

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=feed+ +• • • @ • @ •

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=feed+ +

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=feed+ +• • • @ • @ •

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=feed+ +

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=feed+ +• • • @ • @ •

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=feed+ +

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=feed+ +•feed • mysql • mc

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=feed+ +•

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=feed+ +• mysql: relation.following • fromuid, touid, addtime• addtime desc select * from following where fromuid=? order by• addtime desc select * from following where touid=? order by• fromuid, touid

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=feed+ +• mysql: relation.following relation.follower • fromuid, touid, addtime• addtime desc select * from following where fromuid=? order by• desc select * from follower where touid=? order by addtime•

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=feed+ +• • • • •

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=feed+ +• ta• ta• ta•

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=feed+ +• • c/java • • •

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=feed+ +• redis• hash : • key : user id • fields : friends ids • value : add time

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=feed+ +• redis• hash : • hset fromuid.following touid addtime • hset touid.follower fromuid addtime • hgetAll fromuid. following • hgetAll touid.follower ? • 11,704,598 @Wed Sep 7 21:46:33 CST 2011

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=feed+ +• hash: get one or get all• hash-max-zip-size • 64 -> 256 1/3 • cpu• hgetAll cost too much cpu • add mc• high delay

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=feed+ +

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=feed+ +• • cache ? waste too much mem • storage ? • rdb may lost data • aof r/w too slow, recover too slow • all data in mem, waste money • HA : master slave ? NO WAY • memory fragment

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=feed+ +

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=feed+ +• • mysql binlog >> queue >> Java Processor >> redis • mysql binlog >> trigger >> redis

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=feed+ +• • redis@weibo for now: • TB • growing fast

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=feed+ +• •@ mysql modified + innodb • following list of a user in one column • still under dev

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=feed+ +•

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=feed+ +• • • •@ • •

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=feed+ +

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=feed+ +• • • @ • • • js

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=feed+ +• mc + queue + mysql• mysql• mc mysql• mc

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=feed+ +• • • • •

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=feed+ +• redis• • k-v , 100 byte per k-v • mc • • hash , hget pipeline slow

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=feed+ +• • rdb ? may lost data • aof ? grow too fast (4G/day) • bgsave/bgrewriteaof influence parent

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=feed+ +

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=feed+ +• redis rolling • • • • key

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=feed+ +• • rediscounter @ • array , not linked list • malloc all mem when start • hash key to position • write disk: asyn & slow down • add position to aof file

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=feed+ +• • rediscounter + innodb • auto roll cold data to disk

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=feed+ +• • @TimYang • @XiaoJunHong • • redis (delay) - mc (throughput) - java hash map

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• • cache • storage

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• • • • + •

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• • • / • •

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• • • rdb or aof • •

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• • • rehash

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• HA / Cluster • Redis • Jedis • • •

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• CPU • Redis • hset with big hash-max-zip-size • hgetAll • mc

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• • • • •

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Thanks PS. We are hiring !contact me via @

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Q &A @http://weibo.com/tangfl http://fulin.org