[HBASE-16626] User customized RegionScanner from 1.X is incompatible with 2.0.0's off-heap part

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.0
• Fix Version/s: 2.0.0
• Component/s: Offheaping
• Hadoop Flags: Reviewed
• Assignee: Charlie Qiangeng Xu
• Reporter: Charlie Qiangeng Xu
• Created: 13/Sep/16 11:46
• Updated: 17/Jun/22 05:16
• Resolved: 15/Sep/16 12:38

Description

Introduced by 2.0.0's off-heap feature, the interface RegionScanner extends a new interface Shipper which contains a "shipped()" method.
In our case, some application user defined customized scanner that implements Interface RegionScanner in 1.X .

After we back ported the Off Heap feature of 2.0.0, RegionScannerShippedCallBack throws a "java.lang.AbstractMethodError" when executing scanner.shipped(). It is because the customized scanner didn't override the shipped method yet.

Instead of forcing every user to add a empty implementation(if they don't really need to scan the file or the RS don't use L2 cache, they don't need to do anything in shipped method) , adding a default method of shipped in Interface RegionScanner might be a better way.

Issue Links

• is related to: HBASE-11425 Cell/DBB end-to-end on the read-path
• is superceded by: HBASE-16929 Move default method of shipped to Shipper interface