[HBASE-17106] Wrap arguments to Coprocessor method invocations in Context objects

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Incomplete
• Assignee: Unassigned
• Reporter: Enis Soztutar
• Created: 16/Nov/16 01:08
• Updated: 16/Jun/22 18:18
• Resolved: 16/Jun/22 18:18

Description

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:

  @Deprecated
  InternalScanner preFlushScannerOpen(final ObserverContext<RegionCoprocessorEnvironment> c,
      final Store store, final KeyValueScanner memstoreScanner, final InternalScanner s)
      throws IOException;

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.

Issue Links

• is related to: HBASE-16962 Add readPoint to preCompactScannerOpen() and preFlushScannerOpen() API
• is related to: HBASE-14996 Some more API cleanup for 2.0