[HBASE-19132] Better align bypassable coprocessor methods so all have same pattern

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: Coprocessors
• Assignee: Unassigned
• Reporter: Michael Stack
• Created: 31/Oct/17 12:50
• Updated: 31/Oct/17 12:50

Description

A coprocessor observer hook bypasses – asks to skip normal processing and instead return a result conjured by the coprocessor – by calling bypass on the passed in context. How the bypass is conveyed back to the executing code varies. Usually it is a boolean that the execution tests. But it gets a little odd around Scan Coprocessors especially around next. In a few places we used to allow return of a null object to indicate bypass (flush, compact) but these were fixed by HBASE-19122.

This issue is about giving a general pass over bypass to unify how it done everywhere. I don't think we too bad now after HBASE-18770 but more cleanup to do (Probably an hbase-3 project).