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https://issues.apache.org/jira/browse/HBASE-16626?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15487290#comment-15487290
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Anoop Sam John commented on HBASE-16626:
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bq.adding a default method of shipped in Interface RegionScanner might be a
better way.
+1
> 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: 1.2.2, 1.1.6
> Reporter: Charlie Qiangeng Xu
> Fix For: 2.0.0
>
>
> 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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