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From "Charlie Qiangeng Xu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-16626) User customized RegionScanner from 1.X is incompatible in 2.0.0's off heap part
Date Tue, 13 Sep 2016 11:52:21 GMT

     [ https://issues.apache.org/jira/browse/HBASE-16626?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Charlie Qiangeng Xu updated HBASE-16626:
----------------------------------------
    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.(since
HBASE-15624 we decide to use JAVA8 only in 2.0.0)


  was:
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();

Instead of forcing every one of our users to add a empty implementation(if they don't really
need to scan the file or the RS don't use L2 cache) , adding a default method of shipped might
be a better way.(since HBASE-15624 we decide to use JAVA8 only in 2.0.0)



> User customized RegionScanner from 1.X is incompatible in 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.(since
HBASE-15624 we decide to use JAVA8 only in 2.0.0)



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