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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.hadoop.hbase.coprocessor;
import com.google.common.collect.ImmutableList;
import java.io.IOException;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.NavigableSet;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.Coprocessor;
import org.apache.hadoop.hbase.HBaseInterfaceAudience;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.classification.InterfaceStability;
import org.apache.hadoop.hbase.client.Append;
import org.apache.hadoop.hbase.client.Delete;
import org.apache.hadoop.hbase.client.Durability;
import org.apache.hadoop.hbase.client.Get;
import org.apache.hadoop.hbase.client.Increment;
import org.apache.hadoop.hbase.client.Mutation;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.filter.ByteArrayComparable;
import org.apache.hadoop.hbase.filter.CompareFilter.CompareOp;
import org.apache.hadoop.hbase.io.FSDataInputStreamWrapper;
import org.apache.hadoop.hbase.io.Reference;
import org.apache.hadoop.hbase.io.hfile.CacheConfig;
import org.apache.hadoop.hbase.regionserver.InternalScanner;
import org.apache.hadoop.hbase.regionserver.KeyValueScanner;
import org.apache.hadoop.hbase.regionserver.MiniBatchOperationInProgress;
import org.apache.hadoop.hbase.regionserver.OperationStatus;
import org.apache.hadoop.hbase.regionserver.Region;
import org.apache.hadoop.hbase.regionserver.Region.Operation;
import org.apache.hadoop.hbase.regionserver.RegionScanner;
import org.apache.hadoop.hbase.regionserver.ScanType;
import org.apache.hadoop.hbase.regionserver.Store;
import org.apache.hadoop.hbase.regionserver.StoreFile;
import org.apache.hadoop.hbase.regionserver.StoreFileReader;
import org.apache.hadoop.hbase.regionserver.compactions.CompactionRequest;
import org.apache.hadoop.hbase.regionserver.querymatcher.DeleteTracker;
import org.apache.hadoop.hbase.regionserver.wal.WALEdit;
import org.apache.hadoop.hbase.util.Pair;
import org.apache.hadoop.hbase.wal.WALKey;
/**
* Coprocessors implement this interface to observe and mediate client actions
* on the region.
*
* Since most implementations will be interested in only a subset of hooks, this class uses
* 'default' functions to avoid having to add unnecessary overrides. When the functions are
* non-empty, it's simply to satisfy the compiler by returning value of expected (non-void) type.
* It is done in a way that these default definitions act as no-op. So our suggestion to
* implementation would be to not call these 'default' methods from overrides.
*
*
* Exception Handling
* For all functions, exception handling is done as follows:
*
* - Exceptions of type {@link IOException} are reported back to client.
* - For any other kind of exception:
*
* - If the configuration {@link CoprocessorHost#ABORT_ON_ERROR_KEY} is set to true, then
* the server aborts.
* - Otherwise, coprocessor is removed from the server and
* {@link org.apache.hadoop.hbase.DoNotRetryIOException} is returned to the client.
*
*
*
*/
@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.COPROC)
@InterfaceStability.Evolving
// TODO as method signatures need to break, update to
// ObserverContext
// so we can use additional environment state that isn't exposed to coprocessors.
public interface RegionObserver extends Coprocessor {
/** Mutation type for postMutationBeforeWAL hook */
enum MutationType {
APPEND, INCREMENT
}
/**
* Called before the region is reported as open to the master.
* @param c the environment provided by the region server
*/
default void preOpen(final ObserverContext c) throws IOException {}
/**
* Called after the region is reported as open to the master.
* @param c the environment provided by the region server
*/
default void postOpen(final ObserverContext c) {}
/**
* Called after the log replay on the region is over.
* @param c the environment provided by the region server
*/
default void postLogReplay(final ObserverContext c) {}
/**
* Called before a memstore is flushed to disk and prior to creating the scanner to read from
* the memstore. To override or modify how a memstore is flushed,
* implementing classes can return a new scanner to provide the KeyValues to be
* stored into the new {@code StoreFile} or null to perform the default processing.
* Calling {@link org.apache.hadoop.hbase.coprocessor.ObserverContext#bypass()} has no
* effect in this hook.
* @param c the environment provided by the region server
* @param store the store being flushed
* @param scanners the scanners for the memstore that is flushed
* @param s the base scanner, if not {@code null}, from previous RegionObserver in the chain
* @return the scanner to use during the flush. {@code null} if the default implementation
* is to be used.
* @deprecated Use {@link #preFlushScannerOpen(ObserverContext, Store, List,
* InternalScanner, long)}
*/
@Deprecated
default InternalScanner preFlushScannerOpen(final ObserverContext c,
final Store store, final List scanners, final InternalScanner s)
throws IOException {
return s;
}
/**
* Called before a memstore is flushed to disk and prior to creating the scanner to read from
* the memstore. To override or modify how a memstore is flushed,
* implementing classes can return a new scanner to provide the KeyValues to be
* stored into the new {@code StoreFile} or null to perform the default processing.
* Calling {@link org.apache.hadoop.hbase.coprocessor.ObserverContext#bypass()} has no
* effect in this hook.
* @param c the environment provided by the region server
* @param store the store being flushed
* @param scanners the scanners for the memstore that is flushed
* @param s the base scanner, if not {@code null}, from previous RegionObserver in the chain
* @param readPoint the readpoint to create scanner
* @return the scanner to use during the flush. {@code null} if the default implementation
* is to be used.
*/
default InternalScanner preFlushScannerOpen(final ObserverContext c,
final Store store, final List scanners, final InternalScanner s,
final long readPoint) throws IOException {
return preFlushScannerOpen(c, store, scanners, s);
}
/**
* Maintain backward compatibility.
* @param c the environment provided by the region server
* @param store the store being flushed
* @param scanner the scanner for the memstore that is flushed
* @param s the base scanner, if not {@code null}, from previous RegionObserver in the chain
* @param readPoint the readpoint to create scanner
* @return the scanner to use during the flush. {@code null} if the default implementation
* is to be used.
*/
default InternalScanner preFlushScannerOpen(final ObserverContext c,
final Store store, final KeyValueScanner scanner, final InternalScanner s,
final long readPoint) throws IOException {
return preFlushScannerOpen(c, store, Collections.singletonList(scanner), s, readPoint);
}
/**
* Called before the memstore is flushed to disk.
* @param c the environment provided by the region server
* @deprecated use {@link #preFlush(ObserverContext, Store, InternalScanner)} instead
*/
@Deprecated
default void preFlush(final ObserverContext c) throws IOException {}
/**
* Called before a Store's memstore is flushed to disk.
* @param c the environment provided by the region server
* @param store the store where compaction is being requested
* @param scanner the scanner over existing data used in the store file
* @return the scanner to use during compaction. Should not be {@code null}
* unless the implementation is writing new store files on its own.
*/
default InternalScanner preFlush(final ObserverContext c,
final Store store, final InternalScanner scanner) throws IOException {
return scanner;
}
/**
* Called after the memstore is flushed to disk.
* @param c the environment provided by the region server
* @deprecated use {@link #preFlush(ObserverContext, Store, InternalScanner)} instead.
*/
@Deprecated
default void postFlush(final ObserverContext c)
throws IOException {}
/**
* Called after a Store's memstore is flushed to disk.
* @param c the environment provided by the region server
* @param store the store being flushed
* @param resultFile the new store file written out during compaction
*/
default void postFlush(final ObserverContext c, final Store store,
final StoreFile resultFile) throws IOException {}
/**
* Called prior to selecting the {@link StoreFile StoreFiles} to compact from the list of
* available candidates. To alter the files used for compaction, you may mutate the passed in list
* of candidates.
* @param c the environment provided by the region server
* @param store the store where compaction is being requested
* @param candidates the store files currently available for compaction
* @param request custom compaction request
*/
default void preCompactSelection(final ObserverContext c,
final Store store, final List candidates, final CompactionRequest request)
throws IOException {
preCompactSelection(c, store, candidates);
}
/**
* Called prior to selecting the {@link StoreFile}s to compact from the list of available
* candidates. To alter the files used for compaction, you may mutate the passed in list of
* candidates.
* @param c the environment provided by the region server
* @param store the store where compaction is being requested
* @param candidates the store files currently available for compaction
* @deprecated Use {@link #preCompactSelection(ObserverContext, Store, List, CompactionRequest)}
* instead
*/
@Deprecated
default void preCompactSelection(final ObserverContext c,
final Store store, final List candidates) throws IOException {}
/**
* Called after the {@link StoreFile}s to compact have been selected from the available
* candidates.
* @param c the environment provided by the region server
* @param store the store being compacted
* @param selected the store files selected to compact
* @param request custom compaction request
*/
default void postCompactSelection(final ObserverContext c,
final Store store, final ImmutableList selected, CompactionRequest request) {
postCompactSelection(c, store, selected);
}
/**
* Called after the {@link StoreFile}s to compact have been selected from the available
* candidates.
* @param c the environment provided by the region server
* @param store the store being compacted
* @param selected the store files selected to compact
* @deprecated use {@link #postCompactSelection(ObserverContext, Store, ImmutableList,
* CompactionRequest)} instead.
*/
@Deprecated
default void postCompactSelection(final ObserverContext c,
final Store store, final ImmutableList selected) {}
/**
* Called prior to writing the {@link StoreFile}s selected for compaction into a new
* {@code StoreFile}. To override or modify the compaction process, implementing classes have two
* options:
*
* - Wrap the provided {@link InternalScanner} with a custom implementation that is returned
* from this method. The custom scanner can then inspect
* {@link org.apache.hadoop.hbase.KeyValue}s from the wrapped scanner, applying its own
* policy to what gets written.
* - Call {@link org.apache.hadoop.hbase.coprocessor.ObserverContext#bypass()} and provide a
* custom implementation for writing of new {@link StoreFile}s. Note: any implementations
* bypassing core compaction using this approach must write out new store files themselves or the
* existing data will no longer be available after compaction.
*
* @param c the environment provided by the region server
* @param store the store being compacted
* @param scanner the scanner over existing data used in the store file rewriting
* @param scanType type of Scan
* @param request the requested compaction
* @return the scanner to use during compaction. Should not be {@code null} unless the
* implementation is writing new store files on its own.
*/
default InternalScanner preCompact(final ObserverContext c,
final Store store, final InternalScanner scanner, final ScanType scanType,
CompactionRequest request) throws IOException {
return preCompact(c, store, scanner, scanType);
}
/**
* Called prior to writing the {@link StoreFile}s selected for compaction into a new
* {@code StoreFile}. To override or modify the compaction process, implementing classes have two
* options:
*
* - Wrap the provided {@link InternalScanner} with a custom implementation that is returned
* from this method. The custom scanner can then inspect
* {@link org.apache.hadoop.hbase.KeyValue}s from the wrapped scanner, applying its own
* policy to what gets written.
* - Call {@link org.apache.hadoop.hbase.coprocessor.ObserverContext#bypass()} and provide a
* custom implementation for writing of new {@link StoreFile}s. Note: any implementations
* bypassing core compaction using this approach must write out new store files themselves or the
* existing data will no longer be available after compaction.
*
* @param c the environment provided by the region server
* @param store the store being compacted
* @param scanner the scanner over existing data used in the store file rewriting
* @param scanType type of Scan
* @return the scanner to use during compaction. Should not be {@code null} unless the
* implementation is writing new store files on its own.
* @deprecated use
* {@link #preCompact(ObserverContext, Store, InternalScanner,
* ScanType, CompactionRequest)} instead
*/
@Deprecated
default InternalScanner preCompact(final ObserverContext c,
final Store store, final InternalScanner scanner, final ScanType scanType)
throws IOException {
return scanner;
}
/**
* Called prior to writing the {@link StoreFile}s selected for compaction into a new
* {@code StoreFile} and prior to creating the scanner used to read the input files. To override
* or modify the compaction process, implementing classes can return a new scanner to provide the
* KeyValues to be stored into the new {@code StoreFile} or null to perform the default
* processing. Calling {@link org.apache.hadoop.hbase.coprocessor.ObserverContext#bypass()} has no
* effect in this hook.
* @param c the environment provided by the region server
* @param store the store being compacted
* @param scanners the list {@link org.apache.hadoop.hbase.regionserver.StoreFileScanner}s
* to be read from
* @param scanType the {@link ScanType} indicating whether this is a major or minor compaction
* @param earliestPutTs timestamp of the earliest put that was found in any of the involved store
* files
* @param s the base scanner, if not {@code null}, from previous RegionObserver in the chain
* @param request the requested compaction
* @return the scanner to use during compaction. {@code null} if the default implementation is to
* be used.
* @deprecated Use {@link #preCompactScannerOpen(ObserverContext, Store, List, ScanType, long,
* InternalScanner, CompactionRequest, long)} instead.
*/
@Deprecated
default InternalScanner preCompactScannerOpen(
final ObserverContext c,
final Store store, List scanners, final ScanType scanType,
final long earliestPutTs, final InternalScanner s, CompactionRequest request)
throws IOException {
return preCompactScannerOpen(c, store, scanners, scanType, earliestPutTs, s);
}
/**
* Called prior to writing the {@link StoreFile}s selected for compaction into a new
* {@code StoreFile} and prior to creating the scanner used to read the input files. To override
* or modify the compaction process, implementing classes can return a new scanner to provide the
* KeyValues to be stored into the new {@code StoreFile} or null to perform the default
* processing. Calling {@link org.apache.hadoop.hbase.coprocessor.ObserverContext#bypass()} has no
* effect in this hook.
* @param c the environment provided by the region server
* @param store the store being compacted
* @param scanners the list {@link org.apache.hadoop.hbase.regionserver.StoreFileScanner}s
* to be read from
* @param scanType the {@link ScanType} indicating whether this is a major or minor compaction
* @param earliestPutTs timestamp of the earliest put that was found in any of the involved store
* files
* @param s the base scanner, if not {@code null}, from previous RegionObserver in the chain
* @param request compaction request
* @param readPoint the readpoint to create scanner
* @return the scanner to use during compaction. {@code null} if the default implementation is to
* be used.
*/
default InternalScanner preCompactScannerOpen(
final ObserverContext c,
final Store store, List scanners, final ScanType scanType,
final long earliestPutTs, final InternalScanner s, final CompactionRequest request,
final long readPoint) throws IOException {
return preCompactScannerOpen(c, store, scanners, scanType, earliestPutTs, s, request);
}
/**
* Called prior to writing the {@link StoreFile}s selected for compaction into a new
* {@code StoreFile} and prior to creating the scanner used to read the input files. To override
* or modify the compaction process, implementing classes can return a new scanner to provide the
* KeyValues to be stored into the new {@code StoreFile} or null to perform the default
* processing. Calling {@link org.apache.hadoop.hbase.coprocessor.ObserverContext#bypass()} has no
* effect in this hook.
* @param c the environment provided by the region server
* @param store the store being compacted
* @param scanners the list {@link org.apache.hadoop.hbase.regionserver.StoreFileScanner}s
* to be read from
* @param scanType the {@link ScanType} indicating whether this is a major or minor compaction
* @param earliestPutTs timestamp of the earliest put that was found in any of the involved store
* files
* @param s the base scanner, if not {@code null}, from previous RegionObserver in the chain
* @return the scanner to use during compaction. {@code null} if the default implementation is to
* be used.
* @deprecated Use
* {@link #preCompactScannerOpen(ObserverContext, Store, List, ScanType, long,
* InternalScanner, CompactionRequest, long)} instead.
*/
@Deprecated
default InternalScanner preCompactScannerOpen(
final ObserverContext c,
final Store store, List scanners, final ScanType scanType,
final long earliestPutTs, final InternalScanner s) throws IOException {
return s;
}
/**
* Called after compaction has completed and the new store file has been moved in to place.
* @param c the environment provided by the region server
* @param store the store being compacted
* @param resultFile the new store file written out during compaction
* @param request the requested compaction
*/
default void postCompact(final ObserverContext c, final Store store,
StoreFile resultFile, CompactionRequest request) throws IOException {
postCompact(c, store, resultFile);
}
/**
* Called after compaction has completed and the new store file has been moved in to place.
* @param c the environment provided by the region server
* @param store the store being compacted
* @param resultFile the new store file written out during compaction
* @deprecated Use {@link #postCompact(ObserverContext, Store, StoreFile, CompactionRequest)}
* instead
*/
@Deprecated
default void postCompact(final ObserverContext c, final Store store,
StoreFile resultFile) throws IOException {}
/**
* Called before the region is split.
* @param c the environment provided by the region server
* (e.getRegion() returns the parent region)
* @deprecated No longer called in hbase2/AMv2 given the master runs splits now;
* @see MasterObserver
*/
@Deprecated
default void preSplit(final ObserverContext c) throws IOException {}
/**
* Called before the region is split.
* @param c the environment provided by the region server
* (e.getRegion() returns the parent region)
*
* Note: the logic moves to Master; it is unused in RS
* @deprecated No longer called in hbase2/AMv2 given the master runs splits now;
* @see MasterObserver
*/
@Deprecated
default void preSplit(final ObserverContext c, byte[] splitRow)
throws IOException {}
/**
* Called after the region is split.
* @param c the environment provided by the region server
* (e.getRegion() returns the parent region)
* @param l the left daughter region
* @param r the right daughter region
* @deprecated No longer called in hbase2/AMv2 given the master runs splits now;
* @see MasterObserver
*/
@Deprecated
default void postSplit(final ObserverContext c, final Region l,
final Region r) throws IOException {}
/**
* This will be called before PONR step as part of split transaction. Calling
* {@link org.apache.hadoop.hbase.coprocessor.ObserverContext#bypass()} rollback the split
* @param ctx
* @param splitKey
* @param metaEntries
*
* Note: the logic moves to Master; it is unused in RS
* @deprecated No longer called in hbase2/AMv2 given the master runs splits now;
* @see MasterObserver
*/
@Deprecated
default void preSplitBeforePONR(final ObserverContext ctx,
byte[] splitKey, List metaEntries) throws IOException {}
/**
* This will be called after PONR step as part of split transaction
* Calling {@link org.apache.hadoop.hbase.coprocessor.ObserverContext#bypass()} has no
* effect in this hook.
* @param ctx
* Note: the logic moves to Master; it is unused in RS
* @deprecated No longer called in hbase2/AMv2 given the master runs splits now;
* @see MasterObserver
*/
@Deprecated
default void preSplitAfterPONR(final ObserverContext ctx)
throws IOException {}
/**
* This will be called before the roll back of the split region is completed
* @param ctx
*
* Note: the logic moves to Master; it is unused in RS
* @deprecated No longer called in hbase2/AMv2 given the master runs splits now;
* @see MasterObserver
*/
@Deprecated
default void preRollBackSplit(final ObserverContext ctx)
throws IOException {}
/**
* This will be called after the roll back of the split region is completed
* @param ctx
*
* Note: the logic moves to Master; it is unused in RS
* @deprecated No longer called in hbase2/AMv2 given the master runs splits now;
* @see MasterObserver
*/
@Deprecated
default void postRollBackSplit(final ObserverContext ctx)
throws IOException {}
/**
* Called after any split request is processed. This will be called irrespective of success or
* failure of the split.
* @param ctx
* @deprecated No longer called in hbase2/AMv2 given the master runs splits now;
* implement {@link MasterObserver#postCompletedSplitRegionAction(ObserverContext, HRegionInfo, HRegionInfo)}
* instead.
*/
@Deprecated
default void postCompleteSplit(final ObserverContext ctx)
throws IOException {}
/**
* Called before the region is reported as closed to the master.
* @param c the environment provided by the region server
* @param abortRequested true if the region server is aborting
*/
default void preClose(final ObserverContext c,
boolean abortRequested) throws IOException {}
/**
* Called after the region is reported as closed to the master.
* @param c the environment provided by the region server
* @param abortRequested true if the region server is aborting
*/
default void postClose(final ObserverContext c,
boolean abortRequested) {}
/**
* Called before the client performs a Get
*
* Call CoprocessorEnvironment#bypass to skip default actions
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors
* @param c the environment provided by the region server
* @param get the Get request
* @param result The result to return to the client if default processing
* is bypassed. Can be modified. Will not be used if default processing
* is not bypassed.
*/
default void preGetOp(final ObserverContext c, final Get get,
final List| result)
throws IOException {}
/**
* Called after the client performs a Get
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors
*
* Note: Do not retain references to any Cells in 'result' beyond the life of this invocation.
* If need a Cell reference for later use, copy the cell and use that.
* @param c the environment provided by the region server
* @param get the Get request
* @param result the result to return to the client, modify as necessary
*/
default void postGetOp(final ObserverContext c, final Get get,
final List| result)
throws IOException {}
/**
* Called before the client tests for existence using a Get.
*
* Call CoprocessorEnvironment#bypass to skip default actions
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors
* @param c the environment provided by the region server
* @param get the Get request
* @param exists
* @return the value to return to the client if bypassing default processing
*/
default boolean preExists(final ObserverContext c, final Get get,
final boolean exists) throws IOException {
return exists;
}
/**
* Called after the client tests for existence using a Get.
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors
* @param c the environment provided by the region server
* @param get the Get request
* @param exists the result returned by the region server
* @return the result to return to the client
*/
default boolean postExists(final ObserverContext c, final Get get,
final boolean exists) throws IOException {
return exists;
}
/**
* Called before the client stores a value.
*
* Call CoprocessorEnvironment#bypass to skip default actions
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors
*
* Note: Do not retain references to any Cells in 'put' beyond the life of this invocation.
* If need a Cell reference for later use, copy the cell and use that.
* @param c the environment provided by the region server
* @param put The Put object
* @param edit The WALEdit object that will be written to the wal
* @param durability Persistence guarantee for this Put
*/
default void prePut(final ObserverContext c,
final Put put, final WALEdit edit, final Durability durability)
throws IOException {}
/**
* Called after the client stores a value.
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors
*
* Note: Do not retain references to any Cells in 'put' beyond the life of this invocation.
* If need a Cell reference for later use, copy the cell and use that.
* @param c the environment provided by the region server
* @param put The Put object
* @param edit The WALEdit object for the wal
* @param durability Persistence guarantee for this Put
*/
default void postPut(final ObserverContext c,
final Put put, final WALEdit edit, final Durability durability)
throws IOException {}
/**
* Called before the client deletes a value.
*
* Call CoprocessorEnvironment#bypass to skip default actions
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors
*
* Note: Do not retain references to any Cells in 'delete' beyond the life of this invocation.
* If need a Cell reference for later use, copy the cell and use that.
* @param c the environment provided by the region server
* @param delete The Delete object
* @param edit The WALEdit object for the wal
* @param durability Persistence guarantee for this Delete
*/
default void preDelete(final ObserverContext c,
final Delete delete, final WALEdit edit, final Durability durability)
throws IOException {}
/**
* Called before the server updates the timestamp for version delete with latest timestamp.
*
* Call CoprocessorEnvironment#bypass to skip default actions
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors
* @param c the environment provided by the region server
* @param mutation - the parent mutation associated with this delete cell
* @param cell - The deleteColumn with latest version cell
* @param byteNow - timestamp bytes
* @param get - the get formed using the current cell's row.
* Note that the get does not specify the family and qualifier
*/
default void prePrepareTimeStampForDeleteVersion(
final ObserverContext c,
final Mutation mutation, final Cell cell, final byte[] byteNow,
final Get get) throws IOException {}
/**
* Called after the client deletes a value.
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors
*
* Note: Do not retain references to any Cells in 'delete' beyond the life of this invocation.
* If need a Cell reference for later use, copy the cell and use that.
* @param c the environment provided by the region server
* @param delete The Delete object
* @param edit The WALEdit object for the wal
* @param durability Persistence guarantee for this Delete
*/
default void postDelete(final ObserverContext c,
final Delete delete, final WALEdit edit, final Durability durability)
throws IOException {}
/**
* This will be called for every batch mutation operation happening at the server. This will be
* called after acquiring the locks on the mutating rows and after applying the proper timestamp
* for each Mutation at the server. The batch may contain Put/Delete. By setting OperationStatus
* of Mutations ({@link MiniBatchOperationInProgress#setOperationStatus(int, OperationStatus)}),
* {@link RegionObserver} can make Region to skip these Mutations.
*
* Note: Do not retain references to any Cells in Mutations beyond the life of this invocation.
* If need a Cell reference for later use, copy the cell and use that.
* @param c the environment provided by the region server
* @param miniBatchOp batch of Mutations getting applied to region.
*/
default void preBatchMutate(final ObserverContext c,
final MiniBatchOperationInProgress miniBatchOp) throws IOException {}
/**
* This will be called after applying a batch of Mutations on a region. The Mutations are added to
* memstore and WAL. The difference of this one with
* {@link #postPut(ObserverContext, Put, WALEdit, Durability) }
* and {@link #postDelete(ObserverContext, Delete, WALEdit, Durability) } is
* this hook will be executed before the mvcc transaction completion.
*
* Note: Do not retain references to any Cells in Mutations beyond the life of this invocation.
* If need a Cell reference for later use, copy the cell and use that.
* @param c the environment provided by the region server
* @param miniBatchOp batch of Mutations applied to region.
*/
default void postBatchMutate(final ObserverContext c,
final MiniBatchOperationInProgress miniBatchOp) throws IOException {}
/**
* This will be called for region operations where read lock is acquired in
* {@link Region#startRegionOperation()}.
* @param ctx
* @param operation The operation is about to be taken on the region
*/
default void postStartRegionOperation(final ObserverContext ctx,
Operation operation) throws IOException {}
/**
* Called after releasing read lock in {@link Region#closeRegionOperation()}.
* @param ctx
* @param operation
*/
default void postCloseRegionOperation(final ObserverContext ctx,
Operation operation) throws IOException {}
/**
* Called after the completion of batch put/delete and will be called even if the batch operation
* fails.
*
* Note: Do not retain references to any Cells in Mutations beyond the life of this invocation.
* If need a Cell reference for later use, copy the cell and use that.
* @param ctx
* @param miniBatchOp
* @param success true if batch operation is successful otherwise false.
*/
default void postBatchMutateIndispensably(final ObserverContext ctx,
MiniBatchOperationInProgress miniBatchOp, final boolean success)
throws IOException {}
/**
* Called before checkAndPut.
*
* Call CoprocessorEnvironment#bypass to skip default actions
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors
*
* Note: Do not retain references to any Cells in 'put' beyond the life of this invocation.
* If need a Cell reference for later use, copy the cell and use that.
* @param c the environment provided by the region server
* @param row row to check
* @param family column family
* @param qualifier column qualifier
* @param compareOp the comparison operation
* @param comparator the comparator
* @param put data to put if check succeeds
* @param result
* @return the return value to return to client if bypassing default
* processing
*/
default boolean preCheckAndPut(final ObserverContext c,
final byte [] row, final byte [] family, final byte [] qualifier,
final CompareOp compareOp, final ByteArrayComparable comparator,
final Put put, final boolean result)
throws IOException {
return result;
}
/**
* Called before checkAndPut but after acquiring rowlock.
*
* Note: Caution to be taken for not doing any long time operation in this hook.
* Row will be locked for longer time. Trying to acquire lock on another row, within this,
* can lead to potential deadlock.
*
* Call CoprocessorEnvironment#bypass to skip default actions
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors
*
* Note: Do not retain references to any Cells in 'put' beyond the life of this invocation.
* If need a Cell reference for later use, copy the cell and use that.
* @param c the environment provided by the region server
* @param row row to check
* @param family column family
* @param qualifier column qualifier
* @param compareOp the comparison operation
* @param comparator the comparator
* @param put data to put if check succeeds
* @param result
* @return the return value to return to client if bypassing default
* processing
*/
default boolean preCheckAndPutAfterRowLock(final ObserverContext c,
final byte[] row, final byte[] family, final byte[] qualifier, final CompareOp compareOp,
final ByteArrayComparable comparator, final Put put,
final boolean result) throws IOException {
return result;
}
/**
* Called after checkAndPut
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors
*
* Note: Do not retain references to any Cells in 'put' beyond the life of this invocation.
* If need a Cell reference for later use, copy the cell and use that.
* @param c the environment provided by the region server
* @param row row to check
* @param family column family
* @param qualifier column qualifier
* @param compareOp the comparison operation
* @param comparator the comparator
* @param put data to put if check succeeds
* @param result from the checkAndPut
* @return the possibly transformed return value to return to client
*/
default boolean postCheckAndPut(final ObserverContext c,
final byte [] row, final byte [] family, final byte [] qualifier,
final CompareOp compareOp, final ByteArrayComparable comparator,
final Put put, final boolean result)
throws IOException {
return result;
}
/**
* Called before checkAndDelete.
*
* Call CoprocessorEnvironment#bypass to skip default actions
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors
*
* Note: Do not retain references to any Cells in 'delete' beyond the life of this invocation.
* If need a Cell reference for later use, copy the cell and use that.
* @param c the environment provided by the region server
* @param row row to check
* @param family column family
* @param qualifier column qualifier
* @param compareOp the comparison operation
* @param comparator the comparator
* @param delete delete to commit if check succeeds
* @param result
* @return the value to return to client if bypassing default processing
*/
default boolean preCheckAndDelete(final ObserverContext c,
final byte [] row, final byte [] family, final byte [] qualifier,
final CompareOp compareOp, final ByteArrayComparable comparator,
final Delete delete, final boolean result)
throws IOException {
return result;
}
/**
* Called before checkAndDelete but after acquiring rowock.
*
* Note: Caution to be taken for not doing any long time operation in this hook.
* Row will be locked for longer time. Trying to acquire lock on another row, within this,
* can lead to potential deadlock.
*
* Call CoprocessorEnvironment#bypass to skip default actions
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors
*
* Note: Do not retain references to any Cells in 'delete' beyond the life of this invocation.
* If need a Cell reference for later use, copy the cell and use that.
* @param c the environment provided by the region server
* @param row row to check
* @param family column family
* @param qualifier column qualifier
* @param compareOp the comparison operation
* @param comparator the comparator
* @param delete delete to commit if check succeeds
* @param result
* @return the value to return to client if bypassing default processing
*/
default boolean preCheckAndDeleteAfterRowLock(
final ObserverContext c,
final byte[] row, final byte[] family, final byte[] qualifier, final CompareOp compareOp,
final ByteArrayComparable comparator, final Delete delete,
final boolean result) throws IOException {
return result;
}
/**
* Called after checkAndDelete
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors
*
* Note: Do not retain references to any Cells in 'delete' beyond the life of this invocation.
* If need a Cell reference for later use, copy the cell and use that.
* @param c the environment provided by the region server
* @param row row to check
* @param family column family
* @param qualifier column qualifier
* @param compareOp the comparison operation
* @param comparator the comparator
* @param delete delete to commit if check succeeds
* @param result from the CheckAndDelete
* @return the possibly transformed returned value to return to client
*/
default boolean postCheckAndDelete(final ObserverContext c,
final byte [] row, final byte [] family, final byte [] qualifier,
final CompareOp compareOp, final ByteArrayComparable comparator,
final Delete delete, final boolean result)
throws IOException {
return result;
}
/**
* Called before incrementColumnValue
*
* Call CoprocessorEnvironment#bypass to skip default actions
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors
* @param c the environment provided by the region server
* @param row row to check
* @param family column family
* @param qualifier column qualifier
* @param amount long amount to increment
* @param writeToWAL true if the change should be written to the WAL
* @return value to return to the client if bypassing default processing
* @deprecated This hook is no longer called by the RegionServer
*/
@Deprecated
default long preIncrementColumnValue(final ObserverContext c,
final byte [] row, final byte [] family, final byte [] qualifier,
final long amount, final boolean writeToWAL) throws IOException {
return amount;
}
/**
* Called after incrementColumnValue
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors
* @param c the environment provided by the region server
* @param row row to check
* @param family column family
* @param qualifier column qualifier
* @param amount long amount to increment
* @param writeToWAL true if the change should be written to the WAL
* @param result the result returned by incrementColumnValue
* @return the result to return to the client
* @deprecated This hook is no longer called by the RegionServer
*/
@Deprecated
default long postIncrementColumnValue(final ObserverContext c,
final byte [] row, final byte [] family, final byte [] qualifier,
final long amount, final boolean writeToWAL, final long result) throws IOException {
return result;
}
/**
* Called before Append.
*
* Call CoprocessorEnvironment#bypass to skip default actions
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors
*
* Note: Do not retain references to any Cells in 'append' beyond the life of this invocation.
* If need a Cell reference for later use, copy the cell and use that.
* @param c the environment provided by the region server
* @param append Append object
* @return result to return to the client if bypassing default processing
*/
default Result preAppend(final ObserverContext c,
final Append append)
throws IOException {
return null;
}
/**
* Called before Append but after acquiring rowlock.
*
* Note: Caution to be taken for not doing any long time operation in this hook.
* Row will be locked for longer time. Trying to acquire lock on another row, within this,
* can lead to potential deadlock.
*
* Call CoprocessorEnvironment#bypass to skip default actions
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors
*
* Note: Do not retain references to any Cells in 'append' beyond the life of this invocation.
* If need a Cell reference for later use, copy the cell and use that.
* @param c the environment provided by the region server
* @param append Append object
* @return result to return to the client if bypassing default processing
*/
default Result preAppendAfterRowLock(final ObserverContext c,
final Append append) throws IOException {
return null;
}
/**
* Called after Append
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors
*
* Note: Do not retain references to any Cells in 'append' beyond the life of this invocation.
* If need a Cell reference for later use, copy the cell and use that.
* @param c the environment provided by the region server
* @param append Append object
* @param result the result returned by increment
* @return the result to return to the client
*/
default Result postAppend(final ObserverContext c,
final Append append, final Result result)
throws IOException {
return result;
}
/**
* Called before Increment.
*
* Call CoprocessorEnvironment#bypass to skip default actions
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors
*
* Note: Do not retain references to any Cells in 'increment' beyond the life of this invocation.
* If need a Cell reference for later use, copy the cell and use that.
* @param c the environment provided by the region server
* @param increment increment object
* @return result to return to the client if bypassing default processing
*/
default Result preIncrement(final ObserverContext c,
final Increment increment)
throws IOException {
return null;
}
/**
* Called before Increment but after acquiring rowlock.
*
* Note: Caution to be taken for not doing any long time operation in this hook.
* Row will be locked for longer time. Trying to acquire lock on another row, within this,
* can lead to potential deadlock.
*
* Call CoprocessorEnvironment#bypass to skip default actions
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
*
* Note: Do not retain references to any Cells in 'increment' beyond the life of this invocation.
* If need a Cell reference for later use, copy the cell and use that.
*
* @param c
* the environment provided by the region server
* @param increment
* increment object
* @return result to return to the client if bypassing default processing
* if an error occurred on the coprocessor
*/
default Result preIncrementAfterRowLock(final ObserverContext c,
final Increment increment) throws IOException {
return null;
}
/**
* Called after increment
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors
*
* Note: Do not retain references to any Cells in 'increment' beyond the life of this invocation.
* If need a Cell reference for later use, copy the cell and use that.
* @param c the environment provided by the region server
* @param increment increment object
* @param result the result returned by increment
* @return the result to return to the client
*/
default Result postIncrement(final ObserverContext c,
final Increment increment, final Result result) throws IOException {
return result;
}
/**
* Called before the client opens a new scanner.
*
* Call CoprocessorEnvironment#bypass to skip default actions
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors
*
* Note: Do not retain references to any Cells returned by scanner, beyond the life of this
* invocation. If need a Cell reference for later use, copy the cell and use that.
* @param c the environment provided by the region server
* @param scan the Scan specification
* @param s if not null, the base scanner
* @return an RegionScanner instance to use instead of the base scanner if
* overriding default behavior, null otherwise
*/
default RegionScanner preScannerOpen(final ObserverContext c,
final Scan scan, final RegionScanner s) throws IOException {
return s;
}
/**
* Called before a store opens a new scanner.
* This hook is called when a "user" scanner is opened.
*
* See {@link #preFlushScannerOpen(ObserverContext, Store, List, InternalScanner, long)} and {@link #preCompactScannerOpen(ObserverContext,
* Store, List, ScanType, long, InternalScanner, CompactionRequest, long)}
* to override scanners created for flushes or compactions, resp.
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors.
* Calling {@link org.apache.hadoop.hbase.coprocessor.ObserverContext#bypass()} has no
* effect in this hook.
*
* Note: Do not retain references to any Cells returned by scanner, beyond the life of this
* invocation. If need a Cell reference for later use, copy the cell and use that.
* @param c the environment provided by the region server
* @param store the store being scanned
* @param scan the Scan specification
* @param targetCols columns to be used in the scanner
* @param s the base scanner, if not {@code null}, from previous RegionObserver in the chain
* @return a KeyValueScanner instance to use or {@code null} to use the default implementation
* @deprecated use {@link #preStoreScannerOpen(ObserverContext, Store, Scan, NavigableSet,
* KeyValueScanner, long)} instead
*/
@Deprecated
default KeyValueScanner preStoreScannerOpen(final ObserverContext c,
final Store store, final Scan scan, final NavigableSet targetCols,
final KeyValueScanner s) throws IOException {
return s;
}
/**
* Called before a store opens a new scanner.
* This hook is called when a "user" scanner is opened.
*
* See {@link #preFlushScannerOpen(ObserverContext, Store, List, InternalScanner, long)} and {@link #preCompactScannerOpen(ObserverContext,
* Store, List, ScanType, long, InternalScanner, CompactionRequest, long)}
* to override scanners created for flushes or compactions, resp.
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors.
* Calling {@link org.apache.hadoop.hbase.coprocessor.ObserverContext#bypass()} has no
* effect in this hook.
*
* Note: Do not retain references to any Cells returned by scanner, beyond the life of this
* invocation. If need a Cell reference for later use, copy the cell and use that.
* @param c the environment provided by the region server
* @param store the store being scanned
* @param scan the Scan specification
* @param targetCols columns to be used in the scanner
* @param s the base scanner, if not {@code null}, from previous RegionObserver in the chain
* @param readPt the read point
* @return a KeyValueScanner instance to use or {@code null} to use the default implementation
*/
default KeyValueScanner preStoreScannerOpen(final ObserverContext c,
final Store store, final Scan scan, final NavigableSet targetCols,
final KeyValueScanner s, final long readPt) throws IOException {
return preStoreScannerOpen(c, store, scan, targetCols, s);
}
/**
* Called after the client opens a new scanner.
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors
*
* Note: Do not retain references to any Cells returned by scanner, beyond the life of this
* invocation. If need a Cell reference for later use, copy the cell and use that.
* @param c the environment provided by the region server
* @param scan the Scan specification
* @param s if not null, the base scanner
* @return the scanner instance to use
*/
default RegionScanner postScannerOpen(final ObserverContext c,
final Scan scan, final RegionScanner s)
throws IOException {
return s;
}
/**
* Called before the client asks for the next row on a scanner.
*
* Call CoprocessorEnvironment#bypass to skip default actions
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors
*
* Note: Do not retain references to any Cells returned by scanner, beyond the life of this
* invocation. If need a Cell reference for later use, copy the cell and use that.
* @param c the environment provided by the region server
* @param s the scanner
* @param result The result to return to the client if default processing
* is bypassed. Can be modified. Will not be returned if default processing
* is not bypassed.
* @param limit the maximum number of results to return
* @param hasNext the 'has more' indication
* @return 'has more' indication that should be sent to client
*/
default boolean preScannerNext(final ObserverContext c,
final InternalScanner s, final List result,
final int limit, final boolean hasNext)
throws IOException {
return hasNext;
}
/**
* Called after the client asks for the next row on a scanner.
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors
*
* Note: Do not retain references to any Cells returned by scanner, beyond the life of this
* invocation. If need a Cell reference for later use, copy the cell and use that.
* @param c the environment provided by the region server
* @param s the scanner
* @param result the result to return to the client, can be modified
* @param limit the maximum number of results to return
* @param hasNext the 'has more' indication
* @return 'has more' indication that should be sent to client
*/
default boolean postScannerNext(final ObserverContext c,
final InternalScanner s, final List result, final int limit,
final boolean hasNext) throws IOException {
return hasNext;
}
/**
* This will be called by the scan flow when the current scanned row is being filtered out by the
* filter. The filter may be filtering out the row via any of the below scenarios
*
* -
*
boolean filterRowKey(byte [] buffer, int offset, int length) returning true
* -
*
boolean filterRow() returning true
* -
*
default void filterRow(List<KeyValue> kvs) removing all the kvs
* from the passed List
*
* @param c the environment provided by the region server
* @param s the scanner
* @param currentRow The current rowkey which got filtered out
* @param offset offset to rowkey
* @param length length of rowkey
* @param hasMore the 'has more' indication
* @return whether more rows are available for the scanner or not
* @deprecated As of release 2.0.0, this will be removed in HBase 3.0.0.
* Instead use {@link #postScannerFilterRow(ObserverContext, InternalScanner, Cell, boolean)}
*/
@Deprecated
default boolean postScannerFilterRow(final ObserverContext c,
final InternalScanner s, final byte[] currentRow, final int offset, final short length,
final boolean hasMore) throws IOException {
return hasMore;
}
/**
* This will be called by the scan flow when the current scanned row is being filtered out by the
* filter. The filter may be filtering out the row via any of the below scenarios
*
* -
*
boolean filterRowKey(byte [] buffer, int offset, int length) returning true
* -
*
boolean filterRow() returning true
* -
*
default void filterRow(List<KeyValue> kvs) removing all the kvs from
* the passed List
*
*
* Note: Do not retain references to any Cells returned by scanner, beyond the life of this
* invocation. If need a Cell reference for later use, copy the cell and use that.
* @param c the environment provided by the region server
* @param s the scanner
* @param curRowCell The cell in the current row which got filtered out
* @param hasMore the 'has more' indication
* @return whether more rows are available for the scanner or not
*/
default boolean postScannerFilterRow(final ObserverContext c,
final InternalScanner s, Cell curRowCell, final boolean hasMore) throws IOException {
return hasMore;
}
/**
* Called before the client closes a scanner.
*
* Call CoprocessorEnvironment#bypass to skip default actions
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors
* @param c the environment provided by the region server
* @param s the scanner
*/
default void preScannerClose(final ObserverContext c,
final InternalScanner s) throws IOException {}
/**
* Called after the client closes a scanner.
*
* Call CoprocessorEnvironment#complete to skip any subsequent chained
* coprocessors
* @param ctx the environment provided by the region server
* @param s the scanner
*/
default void postScannerClose(final ObserverContext ctx,
final InternalScanner s) throws IOException {}
/**
* Called before replaying WALs for this region.
* Calling {@link org.apache.hadoop.hbase.coprocessor.ObserverContext#bypass()} has no
* effect in this hook.
* @param ctx the environment provided by the region server
* @param info the RegionInfo for this region
* @param edits the file of recovered edits
*/
default void preReplayWALs(final ObserverContext ctx,
HRegionInfo info, Path edits) throws IOException {}
/**
* Called after replaying WALs for this region.
* @param ctx the environment provided by the region server
* @param info the RegionInfo for this region
* @param edits the file of recovered edits
*/
default void postReplayWALs(final ObserverContext ctx,
HRegionInfo info, Path edits) throws IOException {}
/**
* Called before a {@link org.apache.hadoop.hbase.regionserver.wal.WALEdit}
* replayed for this region.
* @param ctx the environment provided by the region server
*/
default void preWALRestore(final ObserverContext ctx,
HRegionInfo info, WALKey logKey, WALEdit logEdit) throws IOException {}
/**
* Called after a {@link org.apache.hadoop.hbase.regionserver.wal.WALEdit}
* replayed for this region.
* @param ctx the environment provided by the region server
*/
default void postWALRestore(final ObserverContext ctx,
HRegionInfo info, WALKey logKey, WALEdit logEdit) throws IOException {}
/**
* Called before bulkLoadHFile. Users can create a StoreFile instance to
* access the contents of a HFile.
*
* @param ctx the environment provided by the region server
* @param familyPaths pairs of { CF, HFile path } submitted for bulk load. Adding
* or removing from this list will add or remove HFiles to be bulk loaded.
*/
default void preBulkLoadHFile(final ObserverContext ctx,
List> familyPaths) throws IOException {}
/**
* Called before moving bulk loaded hfile to region directory.
*
* @param ctx the environment provided by the region server
* @param family column family
* @param pairs List of pairs of { HFile location in staging dir, HFile path in region dir }
* Each pair are for the same hfile.
*/
default void preCommitStoreFile(final ObserverContext ctx,
final byte[] family, final List> pairs) throws IOException {
}
/**
* Called after moving bulk loaded hfile to region directory.
*
* @param ctx the environment provided by the region server
* @param family column family
* @param srcPath Path to file before the move
* @param dstPath Path to file after the move
*/
default void postCommitStoreFile(final ObserverContext ctx,
final byte[] family, Path srcPath, Path dstPath) throws IOException {}
/**
* Called after bulkLoadHFile.
*
* @param ctx the environment provided by the region server
* @param stagingFamilyPaths pairs of { CF, HFile path } submitted for bulk load
* @param finalPaths Map of CF to List of file paths for the final loaded files
* @param hasLoaded whether the bulkLoad was successful
* @return the new value of hasLoaded
*/
default boolean postBulkLoadHFile(final ObserverContext ctx,
List> stagingFamilyPaths, Map> finalPaths,
boolean hasLoaded) throws IOException {
return postBulkLoadHFile(ctx, stagingFamilyPaths, hasLoaded);
}
/**
* Called after bulkLoadHFile.
*
* @param ctx the environment provided by the region server
* @param stagingFamilyPaths pairs of { CF, HFile path } submitted for bulk load
* @param hasLoaded whether the bulkLoad was successful
* @return the new value of hasLoaded
* @deprecated Use {@link #postBulkLoadHFile(ObserverContext, List, Map, boolean)}
*/
default boolean postBulkLoadHFile(final ObserverContext ctx,
List> stagingFamilyPaths, boolean hasLoaded) throws IOException {
return hasLoaded;
}
/**
* Called before creation of Reader for a store file.
* Calling {@link org.apache.hadoop.hbase.coprocessor.ObserverContext#bypass()} has no
* effect in this hook.
*
* @param ctx the environment provided by the region server
* @param fs fileystem to read from
* @param p path to the file
* @param in {@link FSDataInputStreamWrapper}
* @param size Full size of the file
* @param cacheConf
* @param r original reference file. This will be not null only when reading a split file.
* @param reader the base reader, if not {@code null}, from previous RegionObserver in the chain
* @return a Reader instance to use instead of the base reader if overriding
* default behavior, null otherwise
*/
default StoreFileReader preStoreFileReaderOpen(
final ObserverContext ctx,
final FileSystem fs, final Path p, final FSDataInputStreamWrapper in, long size,
final CacheConfig cacheConf, final Reference r, StoreFileReader reader) throws IOException {
return reader;
}
/**
* Called after the creation of Reader for a store file.
*
* @param ctx the environment provided by the region server
* @param fs fileystem to read from
* @param p path to the file
* @param in {@link FSDataInputStreamWrapper}
* @param size Full size of the file
* @param cacheConf
* @param r original reference file. This will be not null only when reading a split file.
* @param reader the base reader instance
* @return The reader to use
*/
default StoreFileReader postStoreFileReaderOpen(
final ObserverContext ctx,
final FileSystem fs, final Path p, final FSDataInputStreamWrapper in, long size,
final CacheConfig cacheConf, final Reference r, StoreFileReader reader) throws IOException {
return reader;
}
/**
* Called after a new cell has been created during an increment operation, but before
* it is committed to the WAL or memstore.
* Calling {@link org.apache.hadoop.hbase.coprocessor.ObserverContext#bypass()} has no
* effect in this hook.
* @param ctx the environment provided by the region server
* @param opType the operation type
* @param mutation the current mutation
* @param oldCell old cell containing previous value
* @param newCell the new cell containing the computed value
* @return the new cell, possibly changed
*/
default Cell postMutationBeforeWAL(ObserverContext ctx,
MutationType opType, Mutation mutation, Cell oldCell, Cell newCell) throws IOException {
return newCell;
}
/**
* Called after the ScanQueryMatcher creates ScanDeleteTracker. Implementing
* this hook would help in creating customised DeleteTracker and returning
* the newly created DeleteTracker
*
* @param ctx the environment provided by the region server
* @param delTracker the deleteTracker that is created by the QueryMatcher
* @return the Delete Tracker
*/
default DeleteTracker postInstantiateDeleteTracker(
final ObserverContext ctx, DeleteTracker delTracker)
throws IOException {
return delTracker;
}
}
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