[HBASE-13498] Add more docs and a basic check for storage policy handling

• Type: Sub-task
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 1.1.0, 2.0.0
• Component/s: wal
• Assignee: Sean Busbey
• Reporter: Sean Busbey
• Created: 20/Apr/15 05:07
• Updated: 03/Jul/15 23:36
• Resolved: 20/Apr/15 16:29

Description

some minor clean up:

• make sure our javadocs contain enough info for someone unfamiliar with HDFS storage policies to get started.
• add a basic test that verifies things happily continue on non-supported versions, or with non-supported policies
• clarify some log messages