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HBASE-19301
Provide way for CPs to create short circuited connection with custom configurations
The Configuration returned by CPEnv should be read-only.
CoprocessorEnvironment should be exposed to CPs
Add the ClusterStatus hook and cleanup other hooks which can be replaced by ClusterStatus hook
preCompact and preFlush can bypass by returning null scanner; shut it down
Add CP hooks in RegionObserver for in memory compaction
Make Tag IA.LimitedPrivate and expose for CPs
Miscellaneous Observer cleanups
Do not wrap the original CompactionLifeCycleTracker when calling CP hooks
Do not expose getHDFSBlockDistribution in StoreFile
Cleanup MasterObserver hooks which takes IA private params
CP exposed Scanner types should not extend Shipper
RegionObserver#postCompactSelection Avoid passing shaded ImmutableList param
Deprecate RegionObserver#postInstantiateDeleteTracker
Allow CP users to change versions and TTL before opening StoreScanner
Introduce more examples to show how to intercept normal region operations
Remove the hooks in RegionObserver which are designed to construct a StoreScanner which is marked as IA.Private
Move methods that are for internal usage from CellUtil to Private util class
Polish the compaction related CP hooks
Make *CoprocessorHost classes private
Remove the CompactionRequest parameter in preCompactSelection
Make a IA.LimitedPrivate interface for CellComparator
Make ObserverContext an interface and remove private/testing methods
Provide Region#waitForFlushes API
Allow CPs to request flush on Region and know the completion of the requested flush
Use Optional<T> return types when T can be null
Hide protobufs in GlobalQuotaSettings
Purge PB from BulkLoadObserver
Apply RegionInfo to code base
Use HStore instead of Store in our own code base and remove unnecessary methods in Store interface
Use HStoreFile instead of StoreFile in our own code base and remove unnecessary methods in StoreFile interface
Apply RegionInfo to MasterObserver/RegionObserver/WALObserver
We need to pass something like CompactionRequest in CP to give user some information about the compaction
Remove the unused methods in RegionServerObserver
Remove deprecated methods in MasterObserver
Remove deprecated methods in RegionObserver
Remove bypass method in ObserverContext and implement the 'bypass' logic case by case
Introduce new example and helper classes to tell CP users how to do filtering on scanners
Introduce a new constructor for StoreScanner for MOB
CompactionRequest should not be exposed to user directly
Mark StoreFileScanner/StoreFileReader as IA.LimitedPrivate(Phoenix)
RegionServerServices Interface cleanup for CP expose
Region interface cleanup for CP expose
Remove LegacyScanQueryMatcher
Cleanup bypass semantic in MasterCoprocessorHost
MasterServices needs a short-back-and-sides; pare-back exposure of internals and IA.Private classes