[HBASE-10663] Some code cleanup of class Leases and ScannerListener.leaseExpired

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 0.99.0
• Component/s: regionserver
• Hadoop Flags: Reviewed
• Assignee: Honghua Feng
• Reporter: Honghua Feng
• Created: 04/Mar/14 10:22
• Updated: 21/Feb/15 23:28
• Resolved: 07/Mar/14 23:47

Description

Some cleanup of Leases and ScannerListener.leaseExpired:

1. Reject renewLease if stopRequested (same as addLease, stopRequested means Leases is asked to stop and is waiting for all remained leases to expire)
2. Raise log level from info to warn for case that no related region scanner found when a lease expires (should it be an error?)
3. Replace System.currentTimeMillis() with EnvironmentEdgeManager.currentTimeMillis()
4. Correct some wrong comments and remove some irrelevant comments(Queue rather than Map is used for leases before?)