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https://issues.apache.org/jira/browse/HBASE-18431?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16103453#comment-16103453
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Andrew Purtell commented on HBASE-18431:
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[~mdrob] I have only been looking at this in terms of getting 1.4 out the door.
Could do more to provide a path for removal in 2.0. What do you think of this
plan?
* Add back the new SnapshotDescription definition in Snapshot.proto
* Deprecate but do not remove Admin APIs using HBaseProtos#SnapshotDescription
* Create a new SnapshotDescription model class and add ProtobufUtil static
helpers for translating between the model and its serialization.
Insta-deprecated methods returning HBaseProtos#SnapshotDescription. New methods
returning SnapshotProtos#SnapshotDescription. SnapshotDescription model class
will have constructors that accept both. Constructor accepting
HBaseProtos#SnapshotDescription is insta-deprecated.
* Add new Admin APIs using the SnapshotDescription model class
* In 1.x: Leave the coprocessor hook definitions as is
* In 2.x: Replace use of HBaseProtos#SnapshotDescription with
SnapshotDescription model class in coprocessor hooks. My feeling is it is
uglier to have a bunch of deprecated methods in these interfaces than to make a
clean break.
* The DeleteTracker package move that breaks a CP interface is fine for 2.x. No
need to deprecate. Again judging it better to make clean breaks for CP
interfaces on the major version than load down the interfaces with deprecated
methods.
> Mitigate compatibility concerns between branch-1.3 and branch-1.4
> -----------------------------------------------------------------
>
> Key: HBASE-18431
> URL: https://issues.apache.org/jira/browse/HBASE-18431
> Project: HBase
> Issue Type: Bug
> Reporter: Andrew Purtell
> Assignee: Andrew Purtell
> Priority: Blocker
> Fix For: 1.4.0, 1.5.0
>
> Attachments: HBASE-18431-branch-1.4.patch
>
>
> There are compatibility concerns with branch-1.4.
> {noformat}
> Library Name HBase
> Version #1 1.3.1
> Version #2 1.4.0-SNAPSHOT
> Subject Binary Compatibility
> Compatibility - 89.9%
> Added Methods - 305
> Removed Methods - 105
> Problems with Data Types
> High - 23
> Medium - 9
> Low - 21
> {noformat}
> {noformat}
> Library Name HBase
> Version #1 1.3.1
> Version #2 1.4.0-SNAPSHOT
> Subject Source Compatibility
> Compatibility- 86.5%
> Added Methods - 305
> Removed Methods - 105
> Problems with Data Types
> High - 88
> Medium - 0
> Low - 0
> Other Changes in Data Types - 25
> {noformat}
> This report includes HBASE-15816 which hasn't been committed yet. Otherwise
> it's current.
> I'm not generally concerned with added methods.
> The following methods have been added to Public/Evolving interface Table.
> Pointing them out in case it merits review.
> \\
> * Abstract method Table.getReadRpcTimeout ( ) has been added to this
> interface. No effect.
> * Abstract method Table.getWriteRpcTimeout ( ) has been added to this
> interface. No effect.
> * Abstract method Table.setReadRpcTimeout ( int ) has been added to this
> interface. No effect.
> * Abstract method Table.setWriteRpcTimeout ( int ) has been added to this
> interface.
> The Public/Evolving interface Admin has some signature changes equating to
> removed methods. I don't think this is allowed in a minor release.
> \\
> * Abstract method Admin.isSnapshotFinished ( HBaseProtos.SnapshotDescription
> ) has been removed from Admin.
> * Abstract method Admin.snapshot ( String, TableName,
> HBaseProtos.SnapshotDescription.Type ) has been removed from Admin.
> * Abstract method Admin.snapshot ( HBaseProtos.SnapshotDescription ) has been
> removed from Admin.
> * Abstract method Admin.takeSnapshotAsync ( HBaseProtos.SnapshotDescription
> ) has been removed from Admin.
> The LimitedPrivate(CONFIG) interface AsyncRpcClient has been removed. This
> change is debatable but I think we can allow it.
> \\
> * AsyncRpcClient has been removed
> The Public/Evolving class FastLongHistogram has been removed. I don't believe
> this change is allowed in a minor release.
> \\
> * FastLongHistogram has been removed
> Method signatures in LimitedPrivate(COPROC) interfaces MasterObserver and
> RegionObserver have changed, equating to removed methods. The first set of
> changes is due to move of SnapshotDescription from HBaseProtos to
> SnapshotProtos:
> \\
> * Abstract method MasterObserver.postCloneSnapshot (
> ObserverContext<MasterCoprocessorEnvironment>,
> HBaseProtos.SnapshotDescription, HTableDescriptor ) has been removed from
> MasterObserver.
> * Abstract method MasterObserver.postDeleteSnapshot (
> ObserverContext<MasterCoprocessorEnvironment>,
> HBaseProtos.SnapshotDescription ) has been removed from MasterObserver.
> * Abstract method MasterObserver.postListSnapshot (
> ObserverContext<MasterCoprocessorEnvironment>,
> HBaseProtos.SnapshotDescription ) has been removed from MasterObserver.
> * Abstract method MasterObserver.postRestoreSnapshot (
> ObserverContext<MasterCoprocessorEnvironment>,
> HBaseProtos.SnapshotDescription, HTableDescriptor ) has been removed from
> MasterObserver.
> * Abstract method MasterObserver.postSnapshot (
> ObserverContext<MasterCoprocessorEnvironment>,
> HBaseProtos.SnapshotDescription, HTableDescriptor ) has been removed from
> MasterObserver.
> * Abstract method MasterObserver.preCloneSnapshot (
> ObserverContext<MasterCoprocessorEnvironment>,
> HBaseProtos.SnapshotDescription, HTableDescriptor ) has been removed from
> MasterObserver.
> * Abstract method MasterObserver.preDeleteSnapshot (
> ObserverContext<MasterCoprocessorEnvironment>,
> HBaseProtos.SnapshotDescription ) has been removed from MasterObserver.
> * Abstract method MasterObserver.preListSnapshot (
> ObserverContext<MasterCoprocessorEnvironment>,
> HBaseProtos.SnapshotDescription ) has been removed from MasterObserver.
> * Abstract method MasterObserver.preRestoreSnapshot (
> ObserverContext<MasterCoprocessorEnvironment>,
> HBaseProtos.SnapshotDescription, HTableDescriptor ) has been removed from
> MasterObserver.
> * Abstract method MasterObserver.preSnapshot (
> ObserverContext<MasterCoprocessorEnvironment>,
> HBaseProtos.SnapshotDescription, HTableDescriptor ) has been removed from
> MasterObserver.
> Here, maybe DeleteTracker moved packages?
> \\
> * Abstract method RegionObserver.postInstantiateDeleteTracker (
> ObserverContext<RegionCoprocessorEnvironment>, DeleteTracker ) has been
> removed from RegionObserver.
> The LimitedPrivate(COPROC) interface Store has method signature changes
> equating to removed methods. The changes are debatable. I am thinking we can
> allow them. Anyone implementing their own Stores?
> \\
> * Abstract method Store.bulkLoadHFile ( String, long ) has been removed from
> Store.
> * Abstract method Store.getScanners ( List<StoreFile>, boolean, boolean,
> boolean, boolean, ScanQueryMatcher, byte[ ], byte[ ], long, boolean ) has
> been removed from Store.
> * Abstract method Store.getScanners ( boolean, boolean, boolean, boolean,
> ScanQueryMatcher, byte[ ], byte[ ], long ) has been removed from Store.
> * Abstract method Store.upsert ( Iterable<Cell>, long ) has been removed from
> Store.
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