[HBASE-18498] Design improvements to Clock.java

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: HBASE-14070
• Assignee: Apekshit Sharma
• Reporter: Apekshit Sharma
• Created: 02/Aug/17 01:58
• Updated: 14/Aug/17 19:30
• Resolved: 02/Aug/17 22:15

Description

• Delete PhysicalClock interface which seems useless give we have SYSTEM implementation of Clock which is basically the same.
• Embed systemMonotonic clock into HLC to get rid of redundancy in management of physical component, esp logic around ensuring monotonicity.
• Make max_skew in clocks configurable
• Remove isMonotonicallyIncreasing() which is not used.
• update logical overflow test to not use hooks but prod code path
• Added lots of comments.

Issue Links

• is duplicated by: HBASE-18499 Design improvements to Clock.java (duplicate)
• links to: Review Board (HBASE-14070.HLC)