Directly above the
Pictured above, a blue box below the code is more than the blue box above a cache function, output below

Then I below a blue box in the code cache, output the following




Their encapsulation writeDataFrame

CodePudding user response:

Cluster with the spark is 1.5 version

CodePudding user response:

Cluster with the spark is 1.5 version

CodePudding user response:

Cache returns the Dataset. This. Type the
After declaring variables, separate calls to the cache

CodePudding user response:

https://blog.csdn.net/qq_32023541/article/details/79282179
Don't set the memory can fall disk to disk, memory will discard the old cache data, according to data loss

CodePudding user response:

https://blog.csdn.net/qq_32023541/article/details/79282179
Don't set the memory can fall disk to disk, memory will discard the old cache data, cause data loss