Yu Li commented on HBASE-16626:

Thanks all for review [~tedyu], [~anoop.hbase], [~ram_krish], [~chenheng], 
[~stack], and thanks [~anoop.hbase] for help commit this.

> User customized RegionScanner from 1.X is incompatible with 2.0.0's off-heap 
> part
> ---------------------------------------------------------------------------------
>                 Key: HBASE-16626
>                 URL: https://issues.apache.org/jira/browse/HBASE-16626
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Offheaping
>    Affects Versions: 2.0.0
>            Reporter: Charlie Qiangeng Xu
>            Assignee: Charlie Qiangeng Xu
>             Fix For: 2.0.0
>         Attachments: HBASE-16626-v1.patch
> 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.

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