[MAPREDUCE-7182] MapReduce input format/record readers to support S3 select queries

• Type: New Feature
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 3.3.0
• Component/s: mrv2
• Target Version/s: 3.4.0
• Assignee: Unassigned
• Reporter: Steve Loughran
• Created: 04/Feb/19 17:32
• Updated: 09/Apr/20 18:22

Description

HADOOP-15229 adds S3 select through the (new) async openFile API, but the classic RecordReader &c can't handle it because

1. the files are shorter than they are in a getFileStatus, and the readers assume that an EOFException is an error in that situation
2. everything assumes plain text is splitable
3. if a file has a gz extension, the gunzip codec should be used. So breaks transcoded/uncompressed data

to handle s3 select data sources we need to be able to address them, either through changes to the existing code (danger?) or some new readers

Issue Links

• depends upon: HADOOP-15364 Add support for S3 Select to S3A
• depends upon: HADOOP-15229 Add FileSystem builder-based openFile() API to match createFile(); S3A to implement S3 Select through this API.
• is depended upon by: HADOOP-13887 Encrypt S3A data client-side with AWS SDK (S3-CSE)
• is depended upon by: HADOOP-16829 Über-jira: S3A Hadoop 3.4 features