idning.github.io
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http://idning.github.io/
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http://idning.github.io/
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idning.github.io
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http://idning.github.io/category/mongo.html
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http://idning.github.io/redis-data-migrate.html
一个是 redis-mgr 中redis实例的迁移, 迁到一个内存大的机器. 从架构上, 这不需要像redis-cluster那样复杂的重新设计, 用现有的redis就可以完成扩容,. 从单机redis迁移到 redis-mgr / twemproxy 管理的 集群. 从一种集群架构迁移到另一种, 比如迁移到官方redis3.0 集群. 总之, 就算redis3.0 的cluster 成熟以后, 还是需要这样的一套迁移方案. Mysql 的主从同步是基于binlog, redis主从是一个op buf, mongo主从同步是oplog. 所以, 我们可以利用aof, 把它当作binlog, 用于做迁移, 具体的迁移我们在mysql, mongo里面都多次用过了, 分三步:. Redis的aof包含了基准数据和增量, 所以我们只需要把旧集群中redis实例上的aof重放到新集群, 重放追上时修改上层, 把入口换为新集群即可. 的, 意味着如果失败了, 可以重做一次. 也不能重新重放一次, (incr两次, 值就错了). 这个短暂的不一致, 对多数业务, 是能容忍的(很少有业务会高速更新同一个key).
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http://idning.github.io/category/misc.html
Understanding the Linux Kernel(notes).
ning
http://idning.github.io/zookeeper.html
定位为: Distributed Coordination Service. Data in mem = 性能 不错. Transaction logs and snapshots in a persistent store. = 数据持久化. 可用性高: 只要集群中大多数server 存活, 则zk集群是ok的. A: Atomicity - Updates either succeed or fail. No partial results. C: Timeliness(最终一致性) - The clients view of the system is guaranteed to be up-to-date within a certain time bound. I: Sequential Consistency - Updates from a client will be applied in the order that they were sent. 应用广泛: Hbase, Kafka, Spark, Storm. 从 2012年11月发布3.4.5之后, 就很少更新了. Client...
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http://idning.github.io/codis.html
13 Why not Twemproxy and 我的反驳. 预分配: 1024个slot (单实例5G, 大约可以支撑5-10T规模). Codis Redis (codis-server) 修改后的redis. Codis Proxy (codis-proxy) 实现proxy逻辑. Codis Manager (codis-config) 作为工具运行, 调用dashboard api修改配置. 使用中心存储 保存路由, 而不是goisp协议. 13 Why not Twemproxy and 我的反驳. 实际上, 可以通过迁移redis实例来做( 不过确实很痛苦, 我们一般直接迁移整个集群. 实际上, 通过外部工具来做, 效果不错. 实际上, 在作出修改配置决定前, 服务已经出问题至少30s了, 重启花1s并没有问题. 外部工具不断发送slotmigrate给源redis, 每次一个key, 把这个slot中所有key迁移走. 一次迁移一个key, 原子, 阻塞(有的文档说: 我们每次只原子的迁走一个 key，不会把主线程 block 住, 这是不对的). Zk-shell 127.1:...
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What can we do for you? What ICT Infrastructure do you need? Business Intelligence and Analytics. We provide a wide range of telecom solutions for your business. What can we do for you? What ICT Infrastructure do you need? Project management is the application of knowledge, skills and techniques to execute projects effectively and efficiently. It's imperative that you have the correct solutions in place to increase process efficiencies. Business Intelligence and Analytics.
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What can we do for you? What ICT Infrastructure do you need? Business Intelligence and Analytics. We provide a wide range of telecom solutions for your business. What can we do for you? What ICT Infrastructure do you need? Project management is the application of knowledge, skills and techniques to execute projects effectively and efficiently. It's imperative that you have the correct solutions in place to increase process efficiencies. Business Intelligence and Analytics.
