[KYLIN-3289] Refactor the storage garbage clean up code

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: v2.3.0
• Fix Version/s: v2.4.0
• Assignee: Guangyao Li
• Reporter: Guangyao Li
• Created: 13/Mar/18 01:55
• Updated: 23/Jun/18 14:56
• Resolved: 11/Jun/18 06:01

Description

Kylin will produce some garbage data in storage when it runs.

Now, the clean up tool "kylin.sh org.apache.kylin.tool.StorageCleanupJob" can show what is garbage data or clean up the garbage by setting options "–delete false" or "delete true".

But Kylin can't show the size of garbage data for users.

This reconfiguration adds some member variables and methods recording the  garbage size in the detection process. 

After clean up job running over, Kylin can get the information about garbage size.