Spark :How to generate file path to read from s3 with scala

Question

How do I generate and load multiple s3 file path in scala so that I can use :

   sqlContext.read.json ("s3://..../*/*/*")

I know I can use wildcards to read multiple files but is there any way so that I can generate the path ? For example my fIle structure looks like this: BucketName/year/month/day/files

       s3://testBucket/2016/10/16/part00000

These files are all jsons. The issue is I need to load just spacific duration of files, for eg. Say 16 days then I need to loado files for start day ( oct 16) : oct 1 to 16.

With 28 day duration for same start day I would like to read from Sep 18

Can some tell me any ways to do this ?

Answer 1

You can take a look at this answer , You can specify whole directories , use wildcards and even CSV of directories and wildcards . Eg:

sc.textFile("/my/dir1,/my/paths/part-00[0-5]*,/another/dir,/a/specific/file")

Or you can use AWS API to get the list of files locations and read those files using spark .

You can look into this answer to AWS S3 file search.

Answer 2

您可以生成逗号分隔的路径列表： sqlContext.read.json (s3://testBucket/2016/10/16/ ,s3://testBucket/2016/10/15/ ,...);