[jira] [Created] (HBASE-17106) Wrap arguments to Coprocessor method invocations in Context objects

["Enis Soztutar (JIRA)" <ji...@apache.org>]

Enis Soztutar created HBASE-17106:
-------------------------------------

             Summary: Wrap arguments to Coprocessor method invocations in Context objects
                 Key: HBASE-17106
                 URL: https://issues.apache.org/jira/browse/HBASE-17106
             Project: HBase
          Issue Type: New Feature
            Reporter: Enis Soztutar
             Fix For: 2.0.0


As discussed in various contexts (and recently in https://issues.apache.org/jira/browse/HBASE-16962?focusedCommentId=15648512&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15648512) we have a very large number of deprecated methods in RegionObserver (and possibly others) which are due to the fact that the method signatures like: 
{code}
  @Deprecated
  InternalScanner preFlushScannerOpen(final ObserverContext<RegionCoprocessorEnvironment> c,
      final Store store, final KeyValueScanner memstoreScanner, final InternalScanner s)
      throws IOException;
{code}
depend inherently on the internal method signatures which gets changed frequently. 

We should look into wrapping the method arguments for such declerations in the RegionObserver interface so that we can evolve and add new arguments without breaking existing coprocessors between minor versions. 



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