[HADOOP-15012] Add readahead, dropbehind, and unbuffer to StreamCapabilities

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.9.0
• Fix Version/s: 3.1.0, 2.10.0, 2.9.1, 3.0.1
• Component/s: fs
• Target Version/s: 3.1.0
• Hadoop Flags: Reviewed
• Assignee: John Zhuge
• Reporter: John Zhuge
• Created: 02/Nov/17 20:44
• Updated: 29/Dec/17 21:54
• Resolved: 08/Dec/17 05:22

Description

A split from HADOOP-14872 to track changes that enhance StreamCapabilities class with READAHEAD, DROPBEHIND, and UNBUFFER capability.

Discussions and code reviews are done in HADOOP-14872.

Issue Links

• breaks: HDFS-12815 Fix TestUnbuffer#testUnbufferException because of expected error message mismatch
• breaks: HADOOP-15056 Fix TestUnbuffer#testUnbufferException failure
• is depended upon by: HADOOP-14872 CryptoInputStream should implement unbuffer