[HADOOP-11417] review filesystem seek logic, clarify/confirm spec, test & fix compliance

• Type: Task
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.6.0
• Component/s: fs, fs/s3, fs/swift
• Target Version/s: 3.5.0
• Assignee: Steve Loughran
• Reporter: Steve Loughran
• Created: 17/Dec/14 10:00
• Updated: 04/Jan/24 11:31

Description

HADOOP-11270 implies there's a diff in the way HDFS seeks and the object stores on the action seek(len(file))

1. review what HDFS does, add contract test to exactly demonstrate HDFS behaviour.
2. ensure FS spec is consistent with this
3. test/audit all supported filesystems to verify consistent behaviour
4. fix where appropriate

Issue Links

• is depended upon by: HADOOP-11270 Seek behavior difference between NativeS3FsInputStream and DFSInputStream
• is related to: HADOOP-9361 Strictly define the expected behavior of filesystem APIs and write tests to verify compliance