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Name: Altshuler
Type: User
Name: Altshuler
Type: User
akka编程;高并发
:crown: LeetCode of algorithms with java solution(updating).
1)使用mapreduce清洗数据 2)再将输入导入数据仓库(hive+hadoop)3)编写hql进行查询 需求较为复杂 注意使用开窗 行列转换 子查询等技术点
自定义flume source采集数据
采用JavaAPI 在客户端操作hdfs
简单练习使用hive自定义函数
🌻 This is a tutorial of IntelliJ IDEA, you can know how to use IntelliJ IDEA better and better.
kafka:1)使用kafka完成生产和消费 2)生产者消费者分别使用高阶API 和低阶API操作 3)使用kafka自定义分区
练习使用checkPoint 保存SparkStreaming的StreamingContext
使用Hadoop的mapreduce做以下工作:1)简单单词统计 2)使用不同的InputFormat(TextInputFormat,NLine,KeyValue,CombineTextInputFormat),以及自定义输入格式组件3)自定义输出格式组件 4)练习在map端join 和在reduce端join 5)使用辅助排序 6)完成在mapreduce模型下的topN
机器学习:1)离线统计(统计数据即可),离线推荐(基于LFM隐语义模型 采用ALS算法 ,并根据最小方差计算RMSE),2)实时推荐,实时根据用户最近看过的一部电影,找到相似的电影(相似矩阵由上一个需求得出)作为候选电影,再结合最近评分的电影,推出优先级别 3)基于内容(电影)的推荐,TF-IDF算法 4) 针对冷启动问题建议打上专家标签
使用redis测试商品秒杀时线程安全问题 ,采用乐观锁解决后,出现商品富余问题(抢购次数一定范围内大于商品件数时)以及秒杀不公平问题;最后采用lua脚本解决,注意:最后的打印顺序不代表lua脚本的执行顺序,回到Java之后多个线程执行时的乱序性又会出现
无限流量灯,你懂的,我不解释
使用redis测试手机验证码登陆问题
使用Java AP客户端对Zookeeper集群进行基本操作;对Zookeeper的数据,目录进行监听;模拟 使用zookeeper完成多台服务器加路由的后台架构
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