Whether to enable skew join optimization. The algorithm is as follows: At runtime, detect the keys with a large skew. Instead of processing those keys, store them temporarily in an HDFS directory. In a follow-up map-reduce job, process those skewed keys. The same key need not be skewed ...
9. 10. Whether to enable skew join optimization. The algorithm is as follows: At runtime, detect the keys with a large skew. Instead of processing those keys, store them temporarily in an HDFS directory. In a follow-up map-reduce job, process those skewed keys. The same key need not ...
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基于Hive的海量web日志分析系统设计研究江三锋 1 ,王元亮 2 (1.云南财经大学信息学院,云南昆明650000;2.云南财经大学中华职业学院,云南昆明650530) 摘要:针对于传统对海量数据处理和计算的瓶颈,提出了一种基于Hive的海量web日志分析机制。通过Hadoop 分布式系统架构以及Hive数据仓库对海量web日志做了分析处理,并对用户的...
Cost-based optimization in Hive Abstraction已有的大多数hive优化是减少shuffle的开销。这种情况下, 用户必须向hive提交正确的join顺序,执行效率才更高。Hive中的逻辑优化仅限于过滤条件下推、投影修剪(针对于select的列)和分区修剪。**Cost based logical optimizations(CBO)**会自己选择最合适的jo hive 整合spring...