org.apache.hadoop.hbase.coprocessor.MasterObserver Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of hbase-server Show documentation
Show all versions of hbase-server Show documentation
Server functionality for HBase
/*
* 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 java.io.IOException;
import java.util.List;
import java.util.Set;
import org.apache.hadoop.hbase.ClusterMetrics;
import org.apache.hadoop.hbase.HBaseInterfaceAudience;
import org.apache.hadoop.hbase.MetaMutationAnnotation;
import org.apache.hadoop.hbase.NamespaceDescriptor;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.MasterSwitchType;
import org.apache.hadoop.hbase.client.Mutation;
import org.apache.hadoop.hbase.client.RegionInfo;
import org.apache.hadoop.hbase.client.SnapshotDescription;
import org.apache.hadoop.hbase.client.TableDescriptor;
import org.apache.hadoop.hbase.master.RegionPlan;
import org.apache.hadoop.hbase.net.Address;
import org.apache.hadoop.hbase.quotas.GlobalQuotaSettings;
import org.apache.hadoop.hbase.replication.ReplicationPeerConfig;
import org.apache.hadoop.hbase.security.access.Permission;
import org.apache.hadoop.hbase.security.access.UserPermission;
import org.apache.yetus.audience.InterfaceAudience;
import org.apache.yetus.audience.InterfaceStability;
/**
* Defines coprocessor hooks for interacting with operations on the
* {@link org.apache.hadoop.hbase.master.HMaster} process.
*
*
* 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
public interface MasterObserver {
/**
* Called before we create the region infos for this table. Called as part of create table RPC
* call.
* @param ctx the environment to interact with the framework and master
* @param desc the TableDescriptor for the table
* @return the TableDescriptor used to create the table. Default is the one passed in. Return
* {@code null} means cancel the creation.
*/
default TableDescriptor preCreateTableRegionsInfos(
final ObserverContext ctx, TableDescriptor desc)
throws IOException {
return desc;
}
/**
* Called before a new table is created by
* {@link org.apache.hadoop.hbase.master.HMaster}. Called as part of create
* table RPC call.
* @param ctx the environment to interact with the framework and master
* @param desc the TableDescriptor for the table
* @param regions the initial regions created for the table
*/
default void preCreateTable(final ObserverContext ctx,
TableDescriptor desc, RegionInfo[] regions) throws IOException {}
/**
* Called after the createTable operation has been requested. Called as part
* of create table RPC call.
* @param ctx the environment to interact with the framework and master
* @param desc the TableDescriptor for the table
* @param regions the initial regions created for the table
*/
default void postCreateTable(final ObserverContext ctx,
TableDescriptor desc, RegionInfo[] regions) throws IOException {}
/**
* Called before a new table is created by
* {@link org.apache.hadoop.hbase.master.HMaster}. Called as part of create
* table procedure and it is async to the create RPC call.
*
* @param ctx the environment to interact with the framework and master
* @param desc the TableDescriptor for the table
* @param regions the initial regions created for the table
*/
default void preCreateTableAction(
final ObserverContext ctx,
final TableDescriptor desc,
final RegionInfo[] regions) throws IOException {}
/**
* Called after the createTable operation has been requested. Called as part
* of create table RPC call. Called as part of create table procedure and
* it is async to the create RPC call.
*
* @param ctx the environment to interact with the framework and master
* @param desc the TableDescriptor for the table
* @param regions the initial regions created for the table
*/
default void postCompletedCreateTableAction(
final ObserverContext ctx,
final TableDescriptor desc,
final RegionInfo[] regions) throws IOException {}
/**
* Called before {@link org.apache.hadoop.hbase.master.HMaster} deletes a
* table. Called as part of delete table RPC call.
* @param ctx the environment to interact with the framework and master
* @param tableName the name of the table
*/
default void preDeleteTable(final ObserverContext ctx,
TableName tableName) throws IOException {}
/**
* Called after the deleteTable operation has been requested. Called as part
* of delete table RPC call.
* @param ctx the environment to interact with the framework and master
* @param tableName the name of the table
*/
default void postDeleteTable(final ObserverContext ctx,
TableName tableName) throws IOException {}
/**
* Called before {@link org.apache.hadoop.hbase.master.HMaster} deletes a
* table. Called as part of delete table procedure and
* it is async to the delete RPC call.
*
* @param ctx the environment to interact with the framework and master
* @param tableName the name of the table
*/
default void preDeleteTableAction(
final ObserverContext ctx, final TableName tableName)
throws IOException {}
/**
* Called after {@link org.apache.hadoop.hbase.master.HMaster} deletes a
* table. Called as part of delete table procedure and it is async to the
* delete RPC call.
*
* @param ctx the environment to interact with the framework and master
* @param tableName the name of the table
*/
default void postCompletedDeleteTableAction(
final ObserverContext ctx, final TableName tableName)
throws IOException {}
/**
* Called before {@link org.apache.hadoop.hbase.master.HMaster} truncates a
* table. Called as part of truncate table RPC call.
* @param ctx the environment to interact with the framework and master
* @param tableName the name of the table
*/
default void preTruncateTable(final ObserverContext ctx,
TableName tableName) throws IOException {}
/**
* Called after the truncateTable operation has been requested. Called as part
* of truncate table RPC call.
* The truncate is synchronous, so this method will be called when the
* truncate operation is terminated.
* @param ctx the environment to interact with the framework and master
* @param tableName the name of the table
*/
default void postTruncateTable(final ObserverContext ctx,
TableName tableName) throws IOException {}
/**
* Called before {@link org.apache.hadoop.hbase.master.HMaster} truncates a
* table. Called as part of truncate table procedure and it is async
* to the truncate RPC call.
*
* @param ctx the environment to interact with the framework and master
* @param tableName the name of the table
*/
default void preTruncateTableAction(
final ObserverContext ctx, final TableName tableName)
throws IOException {}
/**
* Called after {@link org.apache.hadoop.hbase.master.HMaster} truncates a
* table. Called as part of truncate table procedure and it is async to the
* truncate RPC call.
*
* @param ctx the environment to interact with the framework and master
* @param tableName the name of the table
*/
default void postCompletedTruncateTableAction(
final ObserverContext ctx, final TableName tableName)
throws IOException {}
/**
* Called prior to modifying a table's properties. Called as part of modify
* table RPC call.
* @param ctx the environment to interact with the framework and master
* @param tableName the name of the table
* @param newDescriptor after modify operation, table will have this descriptor
* @deprecated Since 2.1. Will be removed in 3.0.
*/
@Deprecated
default void preModifyTable(final ObserverContext ctx,
final TableName tableName, TableDescriptor newDescriptor) throws IOException {}
/**
* Called prior to modifying a table's properties. Called as part of modify
* table RPC call.
* @param ctx the environment to interact with the framework and master
* @param tableName the name of the table
* @param currentDescriptor current TableDescriptor of the table
* @param newDescriptor after modify operation, table will have this descriptor
*/
default TableDescriptor preModifyTable(final ObserverContext ctx,
final TableName tableName, TableDescriptor currentDescriptor, TableDescriptor newDescriptor)
throws IOException {
return newDescriptor;
}
/**
* Called after the modifyTable operation has been requested. Called as part
* of modify table RPC call.
* @param ctx the environment to interact with the framework and master
* @param tableName the name of the table
* @param currentDescriptor current TableDescriptor of the table
* @deprecated Since 2.1. Will be removed in 3.0.
*/
@Deprecated
default void postModifyTable(final ObserverContext ctx,
final TableName tableName, TableDescriptor currentDescriptor) throws IOException {}
/**
* Called after the modifyTable operation has been requested. Called as part
* of modify table RPC call.
* @param ctx the environment to interact with the framework and master
* @param tableName the name of the table
* @param oldDescriptor descriptor of table before modify operation happened
* @param currentDescriptor current TableDescriptor of the table
*/
default void postModifyTable(final ObserverContext ctx,
final TableName tableName, TableDescriptor oldDescriptor, TableDescriptor currentDescriptor)
throws IOException {
postModifyTable(ctx, tableName, currentDescriptor);
}
/**
* Called prior to modifying a table's properties. Called as part of modify
* table procedure and it is async to the modify table RPC call.
*
* @param ctx the environment to interact with the framework and master
* @param tableName the name of the table
* @param newDescriptor after modify operation, table will have this descriptor
* @deprecated Since 2.1. Will be removed in 3.0.
*/
@Deprecated
default void preModifyTableAction(
final ObserverContext ctx,
final TableName tableName,
final TableDescriptor newDescriptor) throws IOException {}
/**
* Called prior to modifying a table's properties. Called as part of modify
* table procedure and it is async to the modify table RPC call.
*
* @param ctx the environment to interact with the framework and master
* @param tableName the name of the table
* @param currentDescriptor current TableDescriptor of the table
* @param newDescriptor after modify operation, table will have this descriptor
*/
default void preModifyTableAction(
final ObserverContext ctx,
final TableName tableName,
final TableDescriptor currentDescriptor,
final TableDescriptor newDescriptor) throws IOException {
preModifyTableAction(ctx, tableName, newDescriptor);
}
/**
* Called after to modifying a table's properties. Called as part of modify
* table procedure and it is async to the modify table RPC call.
*
* @param ctx the environment to interact with the framework and master
* @param tableName the name of the table
* @param currentDescriptor current TableDescriptor of the table
* @deprecated Since 2.1. Will be removed in 3.0.
*/
@Deprecated
default void postCompletedModifyTableAction(
final ObserverContext ctx,
final TableName tableName,
final TableDescriptor currentDescriptor) throws IOException {}
/**
* Called after to modifying a table's properties. Called as part of modify
* table procedure and it is async to the modify table RPC call.
*
* @param ctx the environment to interact with the framework and master
* @param tableName the name of the table
* @param oldDescriptor descriptor of table before modify operation happened
* @param currentDescriptor current TableDescriptor of the table
*/
default void postCompletedModifyTableAction(
final ObserverContext ctx,
final TableName tableName,
final TableDescriptor oldDescriptor,
final TableDescriptor currentDescriptor) throws IOException {
postCompletedModifyTableAction(ctx, tableName, currentDescriptor);
}
/**
* Called prior to enabling a table. Called as part of enable table RPC call.
* @param ctx the environment to interact with the framework and master
* @param tableName the name of the table
*/
default void preEnableTable(final ObserverContext ctx,
final TableName tableName) throws IOException {}
/**
* Called after the enableTable operation has been requested. Called as part
* of enable table RPC call.
* @param ctx the environment to interact with the framework and master
* @param tableName the name of the table
*/
default void postEnableTable(final ObserverContext ctx,
final TableName tableName) throws IOException {}
/**
* Called prior to enabling a table. Called as part of enable table procedure
* and it is async to the enable table RPC call.
*
* @param ctx the environment to interact with the framework and master
* @param tableName the name of the table
*/
default void preEnableTableAction(
final ObserverContext ctx,
final TableName tableName) throws IOException {}
/**
* Called after the enableTable operation has been requested. Called as part
* of enable table procedure and it is async to the enable table RPC call.
*
* @param ctx the environment to interact with the framework and master
* @param tableName the name of the table
*/
default void postCompletedEnableTableAction(
final ObserverContext ctx,
final TableName tableName) throws IOException {}
/**
* Called prior to disabling a table. Called as part of disable table RPC
* call.
* @param ctx the environment to interact with the framework and master
* @param tableName the name of the table
*/
default void preDisableTable(final ObserverContext ctx,
final TableName tableName) throws IOException {}
/**
* Called after the disableTable operation has been requested. Called as part
* of disable table RPC call.
* @param ctx the environment to interact with the framework and master
* @param tableName the name of the table
*/
default void postDisableTable(final ObserverContext ctx,
final TableName tableName) throws IOException {}
/**
* Called prior to disabling a table. Called as part of disable table procedure
* and it is asyn to the disable table RPC call.
*
* @param ctx the environment to interact with the framework and master
* @param tableName the name of the table
*/
default void preDisableTableAction(
final ObserverContext ctx,
final TableName tableName) throws IOException {}
/**
* Called after the disableTable operation has been requested. Called as part
* of disable table procedure and it is asyn to the disable table RPC call.
*
* @param ctx the environment to interact with the framework and master
* @param tableName the name of the table
*/
default void postCompletedDisableTableAction(
final ObserverContext ctx,
final TableName tableName) throws IOException {}
/**
* Called before a abortProcedure request has been processed.
* @param ctx the environment to interact with the framework and master
* @param procId the Id of the procedure
*/
default void preAbortProcedure(
ObserverContext ctx, final long procId) throws IOException {}
/**
* Called after a abortProcedure request has been processed.
* @param ctx the environment to interact with the framework and master
*/
default void postAbortProcedure(ObserverContext ctx)
throws IOException {}
/**
* Called before a getProcedures request has been processed.
* @param ctx the environment to interact with the framework and master
*/
default void preGetProcedures(ObserverContext ctx)
throws IOException {}
/**
* Called after a getProcedures request has been processed.
* @param ctx the environment to interact with the framework and master
*/
default void postGetProcedures(ObserverContext ctx)
throws IOException {}
/**
* Called before a getLocks request has been processed.
* @param ctx the environment to interact with the framework and master
* @throws IOException if something went wrong
*/
default void preGetLocks(ObserverContext ctx)
throws IOException {}
/**
* Called after a getLocks request has been processed.
* @param ctx the environment to interact with the framework and master
* @throws IOException if something went wrong
*/
default void postGetLocks(
ObserverContext ctx) throws IOException {}
/**
* Called prior to moving a given region from one region server to another.
* @param ctx the environment to interact with the framework and master
* @param region the RegionInfo
* @param srcServer the source ServerName
* @param destServer the destination ServerName
*/
default void preMove(final ObserverContext ctx,
final RegionInfo region, final ServerName srcServer,
final ServerName destServer)
throws IOException {}
/**
* Called after the region move has been requested.
* @param ctx the environment to interact with the framework and master
* @param region the RegionInfo
* @param srcServer the source ServerName
* @param destServer the destination ServerName
*/
default void postMove(final ObserverContext ctx,
final RegionInfo region, final ServerName srcServer,
final ServerName destServer)
throws IOException {}
/**
* Called prior to assigning a specific region.
* @param ctx the environment to interact with the framework and master
* @param regionInfo the regionInfo of the region
*/
default void preAssign(final ObserverContext ctx,
final RegionInfo regionInfo) throws IOException {}
/**
* Called after the region assignment has been requested.
* @param ctx the environment to interact with the framework and master
* @param regionInfo the regionInfo of the region
*/
default void postAssign(final ObserverContext ctx,
final RegionInfo regionInfo) throws IOException {}
/**
* Called prior to unassigning a given region.
* @param ctx the environment to interact with the framework and master
* @param regionInfo
* @param force whether to force unassignment or not
*/
default void preUnassign(final ObserverContext ctx,
final RegionInfo regionInfo, final boolean force) throws IOException {}
/**
* Called after the region unassignment has been requested.
* @param ctx the environment to interact with the framework and master
* @param regionInfo
* @param force whether to force unassignment or not
*/
default void postUnassign(final ObserverContext ctx,
final RegionInfo regionInfo, final boolean force) throws IOException {}
/**
* Called prior to marking a given region as offline.
* @param ctx the environment to interact with the framework and master
* @param regionInfo
*/
default void preRegionOffline(final ObserverContext ctx,
final RegionInfo regionInfo) throws IOException {}
/**
* Called after the region has been marked offline.
* @param ctx the environment to interact with the framework and master
* @param regionInfo
*/
default void postRegionOffline(final ObserverContext ctx,
final RegionInfo regionInfo) throws IOException {}
/**
* Called prior to requesting rebalancing of the cluster regions, though after
* the initial checks for regions in transition and the balance switch flag.
* @param ctx the environment to interact with the framework and master
*/
default void preBalance(final ObserverContext ctx)
throws IOException {}
/**
* Called after the balancing plan has been submitted.
* @param ctx the environment to interact with the framework and master
* @param plans the RegionPlans which master has executed. RegionPlan serves as hint
* as for the final destination for the underlying region but may not represent the
* final state of assignment
*/
default void postBalance(final ObserverContext ctx, List plans)
throws IOException {}
/**
* Called prior to setting split / merge switch
* Supports Coprocessor 'bypass'.
* @param ctx the coprocessor instance's environment
* @param newValue the new value submitted in the call
* @param switchType type of switch
*/
default void preSetSplitOrMergeEnabled(final ObserverContext ctx,
final boolean newValue, final MasterSwitchType switchType) throws IOException {}
/**
* Called after setting split / merge switch
* @param ctx the coprocessor instance's environment
* @param newValue the new value submitted in the call
* @param switchType type of switch
*/
default void postSetSplitOrMergeEnabled(final ObserverContext ctx,
final boolean newValue, final MasterSwitchType switchType) throws IOException {}
/**
* Called before the split region procedure is called.
* @param c the environment to interact with the framework and master
* @param tableName the table where the region belongs to
* @param splitRow split point
*/
default void preSplitRegion(
final ObserverContext c,
final TableName tableName,
final byte[] splitRow)
throws IOException {}
/**
* Called before the region is split.
* @param c the environment to interact with the framework and master
* @param tableName the table where the region belongs to
* @param splitRow split point
*/
default void preSplitRegionAction(
final ObserverContext c,
final TableName tableName,
final byte[] splitRow)
throws IOException {}
/**
* Called after the region is split.
* @param c the environment to interact with the framework and master
* @param regionInfoA the left daughter region
* @param regionInfoB the right daughter region
*/
default void postCompletedSplitRegionAction(
final ObserverContext c,
final RegionInfo regionInfoA,
final RegionInfo regionInfoB) throws IOException {}
/**
* This will be called before update META step as part of split transaction.
* @param ctx the environment to interact with the framework and master
* @param splitKey
* @param metaEntries
*/
default void preSplitRegionBeforeMETAAction(
final ObserverContext ctx,
final byte[] splitKey,
final List metaEntries) throws IOException {}
/**
* This will be called after update META step as part of split transaction
* @param ctx the environment to interact with the framework and master
*/
default void preSplitRegionAfterMETAAction(
final ObserverContext ctx)
throws IOException {}
/**
* This will be called after the roll back of the split region is completed
* @param ctx the environment to interact with the framework and master
*/
default void postRollBackSplitRegionAction(
final ObserverContext ctx)
throws IOException {}
/**
* Called before the regions merge.
* @param ctx the environment to interact with the framework and master
*/
default void preMergeRegionsAction(
final ObserverContext ctx,
final RegionInfo[] regionsToMerge) throws IOException {}
/**
* called after the regions merge.
* @param ctx the environment to interact with the framework and master
*/
default void postCompletedMergeRegionsAction(
final ObserverContext ctx,
final RegionInfo[] regionsToMerge,
final RegionInfo mergedRegion) throws IOException {}
/**
* This will be called before update META step as part of regions merge transaction.
* @param ctx the environment to interact with the framework and master
* @param metaEntries mutations to execute on hbase:meta atomically with regions merge updates.
* Any puts or deletes to execute on hbase:meta can be added to the mutations.
*/
default void preMergeRegionsCommitAction(
final ObserverContext ctx,
final RegionInfo[] regionsToMerge,
@MetaMutationAnnotation List metaEntries) throws IOException {}
/**
* This will be called after META step as part of regions merge transaction.
* @param ctx the environment to interact with the framework and master
*/
default void postMergeRegionsCommitAction(
final ObserverContext ctx,
final RegionInfo[] regionsToMerge,
final RegionInfo mergedRegion) throws IOException {}
/**
* This will be called after the roll back of the regions merge.
* @param ctx the environment to interact with the framework and master
*/
default void postRollBackMergeRegionsAction(
final ObserverContext ctx,
final RegionInfo[] regionsToMerge) throws IOException {}
/**
* Called prior to modifying the flag used to enable/disable region balancing.
* @param ctx the coprocessor instance's environment
*/
default void preBalanceSwitch(final ObserverContext ctx,
final boolean newValue) throws IOException {}
/**
* Called after the flag to enable/disable balancing has changed.
* @param ctx the coprocessor instance's environment
* @param oldValue the previously set balanceSwitch value
* @param newValue the newly set balanceSwitch value
*/
default void postBalanceSwitch(final ObserverContext ctx,
final boolean oldValue, final boolean newValue) throws IOException {}
/**
* Called prior to shutting down the full HBase cluster, including this
* {@link org.apache.hadoop.hbase.master.HMaster} process.
*/
default void preShutdown(final ObserverContext ctx)
throws IOException {}
/**
* Called immediately prior to stopping this
* {@link org.apache.hadoop.hbase.master.HMaster} process.
*/
default void preStopMaster(final ObserverContext ctx)
throws IOException {}
/**
* Called immediately after an active master instance has completed
* initialization. Will not be called on standby master instances unless
* they take over the active role.
*/
default void postStartMaster(final ObserverContext ctx)
throws IOException {}
/**
* Call before the master initialization is set to true.
* {@link org.apache.hadoop.hbase.master.HMaster} process.
*/
default void preMasterInitialization(final ObserverContext ctx)
throws IOException {}
/**
* Called before a new snapshot is taken.
* Called as part of snapshot RPC call.
* @param ctx the environment to interact with the framework and master
* @param snapshot the SnapshotDescriptor for the snapshot
* @param tableDescriptor the TableDescriptor of the table to snapshot
*/
default void preSnapshot(final ObserverContext ctx,
final SnapshotDescription snapshot, final TableDescriptor tableDescriptor)
throws IOException {}
/**
* Called after the snapshot operation has been requested.
* Called as part of snapshot RPC call.
* @param ctx the environment to interact with the framework and master
* @param snapshot the SnapshotDescriptor for the snapshot
* @param tableDescriptor the TableDescriptor of the table to snapshot
*/
default void postSnapshot(final ObserverContext ctx,
final SnapshotDescription snapshot, final TableDescriptor tableDescriptor)
throws IOException {}
/**
* Called before listSnapshots request has been processed.
* @param ctx the environment to interact with the framework and master
* @param snapshot the SnapshotDescriptor of the snapshot to list
*/
default void preListSnapshot(final ObserverContext ctx,
final SnapshotDescription snapshot) throws IOException {}
/**
* Called after listSnapshots request has been processed.
* @param ctx the environment to interact with the framework and master
* @param snapshot the SnapshotDescriptor of the snapshot to list
*/
default void postListSnapshot(final ObserverContext ctx,
final SnapshotDescription snapshot) throws IOException {}
/**
* Called before a snapshot is cloned.
* Called as part of restoreSnapshot RPC call.
* @param ctx the environment to interact with the framework and master
* @param snapshot the SnapshotDescriptor for the snapshot
* @param tableDescriptor the TableDescriptor of the table to create
*/
default void preCloneSnapshot(final ObserverContext ctx,
final SnapshotDescription snapshot, final TableDescriptor tableDescriptor)
throws IOException {}
/**
* Called after a snapshot clone operation has been requested.
* Called as part of restoreSnapshot RPC call.
* @param ctx the environment to interact with the framework and master
* @param snapshot the SnapshotDescriptor for the snapshot
* @param tableDescriptor the v of the table to create
*/
default void postCloneSnapshot(final ObserverContext ctx,
final SnapshotDescription snapshot, final TableDescriptor tableDescriptor)
throws IOException {}
/**
* Called before a snapshot is restored.
* Called as part of restoreSnapshot RPC call.
* @param ctx the environment to interact with the framework and master
* @param snapshot the SnapshotDescriptor for the snapshot
* @param tableDescriptor the TableDescriptor of the table to restore
*/
default void preRestoreSnapshot(final ObserverContext ctx,
final SnapshotDescription snapshot, final TableDescriptor tableDescriptor)
throws IOException {}
/**
* Called after a snapshot restore operation has been requested.
* Called as part of restoreSnapshot RPC call.
* @param ctx the environment to interact with the framework and master
* @param snapshot the SnapshotDescriptor for the snapshot
* @param tableDescriptor the TableDescriptor of the table to restore
*/
default void postRestoreSnapshot(final ObserverContext ctx,
final SnapshotDescription snapshot, final TableDescriptor tableDescriptor)
throws IOException {}
/**
* Called before a snapshot is deleted.
* Called as part of deleteSnapshot RPC call.
* @param ctx the environment to interact with the framework and master
* @param snapshot the SnapshotDescriptor of the snapshot to delete
*/
default void preDeleteSnapshot(final ObserverContext ctx,
final SnapshotDescription snapshot) throws IOException {}
/**
* Called after the delete snapshot operation has been requested.
* Called as part of deleteSnapshot RPC call.
* @param ctx the environment to interact with the framework and master
* @param snapshot the SnapshotDescriptor of the snapshot to delete
*/
default void postDeleteSnapshot(final ObserverContext ctx,
final SnapshotDescription snapshot) throws IOException {}
/**
* Called before a getTableDescriptors request has been processed.
* @param ctx the environment to interact with the framework and master
* @param tableNamesList the list of table names, or null if querying for all
* @param descriptors an empty list, can be filled with what to return in coprocessor
* @param regex regular expression used for filtering the table names
*/
default void preGetTableDescriptors(ObserverContext ctx,
List tableNamesList, List descriptors,
String regex) throws IOException {}
/**
* Called after a getTableDescriptors request has been processed.
* @param ctx the environment to interact with the framework and master
* @param tableNamesList the list of table names, or null if querying for all
* @param descriptors the list of descriptors about to be returned
* @param regex regular expression used for filtering the table names
*/
default void postGetTableDescriptors(ObserverContext ctx,
List tableNamesList, List descriptors,
String regex) throws IOException {}
/**
* Called before a getTableNames request has been processed.
* @param ctx the environment to interact with the framework and master
* @param descriptors an empty list, can be filled with what to return by coprocessor
* @param regex regular expression used for filtering the table names
*/
default void preGetTableNames(ObserverContext ctx,
List descriptors, String regex) throws IOException {}
/**
* Called after a getTableNames request has been processed.
* @param ctx the environment to interact with the framework and master
* @param descriptors the list of descriptors about to be returned
* @param regex regular expression used for filtering the table names
*/
default void postGetTableNames(ObserverContext ctx,
List descriptors, String regex) throws IOException {}
/**
* Called before a new namespace is created by
* {@link org.apache.hadoop.hbase.master.HMaster}.
* @param ctx the environment to interact with the framework and master
* @param ns the NamespaceDescriptor for the table
*/
default void preCreateNamespace(final ObserverContext ctx,
NamespaceDescriptor ns) throws IOException {}
/**
* Called after the createNamespace operation has been requested.
* @param ctx the environment to interact with the framework and master
* @param ns the NamespaceDescriptor for the table
*/
default void postCreateNamespace(final ObserverContext ctx,
NamespaceDescriptor ns) throws IOException {}
/**
* Called before {@link org.apache.hadoop.hbase.master.HMaster} deletes a
* namespace
* @param ctx the environment to interact with the framework and master
* @param namespace the name of the namespace
*/
default void preDeleteNamespace(final ObserverContext ctx,
String namespace) throws IOException {}
/**
* Called after the deleteNamespace operation has been requested.
* @param ctx the environment to interact with the framework and master
* @param namespace the name of the namespace
*/
default void postDeleteNamespace(final ObserverContext ctx,
String namespace) throws IOException {}
/**
* Called prior to modifying a namespace's properties.
* @param ctx the environment to interact with the framework and master
* @param newNsDescriptor after modify operation, namespace will have this descriptor
* @deprecated Since 2.1. Will be removed in 3.0.
*/
@Deprecated
default void preModifyNamespace(final ObserverContext ctx,
NamespaceDescriptor newNsDescriptor) throws IOException {}
/**
* Called prior to modifying a namespace's properties.
* @param ctx the environment to interact with the framework and master
* @param currentNsDescriptor current NamespaceDescriptor of the namespace
* @param newNsDescriptor after modify operation, namespace will have this descriptor
*/
default void preModifyNamespace(final ObserverContext ctx,
NamespaceDescriptor currentNsDescriptor, NamespaceDescriptor newNsDescriptor)
throws IOException {
preModifyNamespace(ctx, newNsDescriptor);
}
/**
* Called after the modifyNamespace operation has been requested.
* @param ctx the environment to interact with the framework and master
* @param currentNsDescriptor current NamespaceDescriptor of the namespace
* @deprecated Since 2.1. Will be removed in 3.0.
*/
@Deprecated
default void postModifyNamespace(final ObserverContext ctx,
NamespaceDescriptor currentNsDescriptor) throws IOException {}
/**
* Called after the modifyNamespace operation has been requested.
* @param ctx the environment to interact with the framework and master
* @param oldNsDescriptor descriptor of namespace before modify operation happened
* @param currentNsDescriptor current NamespaceDescriptor of the namespace
*/
default void postModifyNamespace(final ObserverContext ctx,
NamespaceDescriptor oldNsDescriptor, NamespaceDescriptor currentNsDescriptor)
throws IOException {
postModifyNamespace(ctx, currentNsDescriptor);
}
/**
* Called before a getNamespaceDescriptor request has been processed.
* @param ctx the environment to interact with the framework and master
* @param namespace the name of the namespace
*/
default void preGetNamespaceDescriptor(ObserverContext ctx,
String namespace) throws IOException {}
/**
* Called after a getNamespaceDescriptor request has been processed.
* @param ctx the environment to interact with the framework and master
* @param ns the NamespaceDescriptor
*/
default void postGetNamespaceDescriptor(ObserverContext ctx,
NamespaceDescriptor ns) throws IOException {}
/**
* Called before a listNamespaceDescriptors request has been processed.
* @param ctx the environment to interact with the framework and master
* @param descriptors an empty list, can be filled with what to return by coprocessor
*/
default void preListNamespaceDescriptors(ObserverContext ctx,
List descriptors) throws IOException {}
/**
* Called after a listNamespaceDescriptors request has been processed.
* @param ctx the environment to interact with the framework and master
* @param descriptors the list of descriptors about to be returned
*/
default void postListNamespaceDescriptors(ObserverContext ctx,
List descriptors) throws IOException {}
/**
* Called before the table memstore is flushed to disk.
* @param ctx the environment to interact with the framework and master
* @param tableName the name of the table
*/
default void preTableFlush(final ObserverContext ctx,
final TableName tableName) throws IOException {}
/**
* Called after the table memstore is flushed to disk.
* @param ctx the environment to interact with the framework and master
* @param tableName the name of the table
*/
default void postTableFlush(final ObserverContext ctx,
final TableName tableName) throws IOException {}
/**
* Called before the quota for the user is stored.
* @param ctx the environment to interact with the framework and master
* @param userName the name of user
* @param quotas the current quota for the user
*/
default void preSetUserQuota(final ObserverContext ctx,
final String userName, final GlobalQuotaSettings quotas) throws IOException {}
/**
* Called after the quota for the user is stored.
* @param ctx the environment to interact with the framework and master
* @param userName the name of user
* @param quotas the resulting quota for the user
*/
default void postSetUserQuota(final ObserverContext ctx,
final String userName, final GlobalQuotaSettings quotas) throws IOException {}
/**
* Called before the quota for the user on the specified table is stored.
* @param ctx the environment to interact with the framework and master
* @param userName the name of user
* @param tableName the name of the table
* @param quotas the current quota for the user on the table
*/
default void preSetUserQuota(
final ObserverContext ctx, final String userName,
final TableName tableName, final GlobalQuotaSettings quotas) throws IOException {}
/**
* Called after the quota for the user on the specified table is stored.
* @param ctx the environment to interact with the framework and master
* @param userName the name of user
* @param tableName the name of the table
* @param quotas the resulting quota for the user on the table
*/
default void postSetUserQuota(
final ObserverContext ctx, final String userName,
final TableName tableName, final GlobalQuotaSettings quotas) throws IOException {}
/**
* Called before the quota for the user on the specified namespace is stored.
* @param ctx the environment to interact with the framework and master
* @param userName the name of user
* @param namespace the name of the namespace
* @param quotas the current quota for the user on the namespace
*/
default void preSetUserQuota(
final ObserverContext ctx, final String userName,
final String namespace, final GlobalQuotaSettings quotas) throws IOException {}
/**
* Called after the quota for the user on the specified namespace is stored.
* @param ctx the environment to interact with the framework and master
* @param userName the name of user
* @param namespace the name of the namespace
* @param quotas the resulting quota for the user on the namespace
*/
default void postSetUserQuota(
final ObserverContext ctx, final String userName,
final String namespace, final GlobalQuotaSettings quotas) throws IOException {}
/**
* Called before the quota for the table is stored.
* @param ctx the environment to interact with the framework and master
* @param tableName the name of the table
* @param quotas the current quota for the table
*/
default void preSetTableQuota(final ObserverContext ctx,
final TableName tableName, final GlobalQuotaSettings quotas) throws IOException {}
/**
* Called after the quota for the table is stored.
* @param ctx the environment to interact with the framework and master
* @param tableName the name of the table
* @param quotas the resulting quota for the table
*/
default void postSetTableQuota(final ObserverContext ctx,
final TableName tableName, final GlobalQuotaSettings quotas) throws IOException {}
/**
* Called before the quota for the namespace is stored.
* @param ctx the environment to interact with the framework and master
* @param namespace the name of the namespace
* @param quotas the current quota for the namespace
*/
default void preSetNamespaceQuota(final ObserverContext ctx,
final String namespace, final GlobalQuotaSettings quotas) throws IOException {}
/**
* Called after the quota for the namespace is stored.
* @param ctx the environment to interact with the framework and master
* @param namespace the name of the namespace
* @param quotas the resulting quota for the namespace
*/
default void postSetNamespaceQuota(final ObserverContext ctx,
final String namespace, final GlobalQuotaSettings quotas) throws IOException {}
/**
* Called before the quota for the region server is stored.
* @param ctx the environment to interact with the framework and master
* @param regionServer the name of the region server
* @param quotas the current quota for the region server
*/
default void preSetRegionServerQuota(final ObserverContext ctx,
final String regionServer, final GlobalQuotaSettings quotas) throws IOException {}
/**
* Called after the quota for the region server is stored.
* @param ctx the environment to interact with the framework and master
* @param regionServer the name of the region server
* @param quotas the resulting quota for the region server
*/
default void postSetRegionServerQuota(final ObserverContext ctx,
final String regionServer, final GlobalQuotaSettings quotas) throws IOException {}
/**
* Called before merge regions request.
* @param ctx coprocessor environment
* @param regionsToMerge regions to be merged
*/
default void preMergeRegions(
final ObserverContext ctx,
final RegionInfo[] regionsToMerge) throws IOException {}
/**
* called after merge regions request.
* @param c coprocessor environment
* @param regionsToMerge regions to be merged
*/
default void postMergeRegions(
final ObserverContext c,
final RegionInfo[] regionsToMerge) throws IOException {}
/**
* Called before servers are moved to target region server group
* @param ctx the environment to interact with the framework and master
* @param servers set of servers to move
* @param targetGroup destination group
*/
default void preMoveServersAndTables(final ObserverContext ctx,
Set servers, Set tables, String targetGroup) throws IOException {}
/**
* Called after servers are moved to target region server group
* @param ctx the environment to interact with the framework and master
* @param servers set of servers to move
* @param targetGroup name of group
*/
default void postMoveServersAndTables(final ObserverContext ctx,
Set servers, Set tables, String targetGroup) throws IOException {}
/**
* Called before servers are moved to target region server group
* @param ctx the environment to interact with the framework and master
* @param servers set of servers to move
* @param targetGroup destination group
*/
default void preMoveServers(final ObserverContext ctx,
Set servers, String targetGroup) throws IOException {}
/**
* Called after servers are moved to target region server group
* @param ctx the environment to interact with the framework and master
* @param servers set of servers to move
* @param targetGroup name of group
*/
default void postMoveServers(final ObserverContext ctx,
Set servers, String targetGroup) throws IOException {}
/**
* Called before tables are moved to target region server group
* @param ctx the environment to interact with the framework and master
* @param tables set of tables to move
* @param targetGroup name of group
*/
default void preMoveTables(final ObserverContext ctx,
Set tables, String targetGroup) throws IOException {}
/**
* Called after servers are moved to target region server group
* @param ctx the environment to interact with the framework and master
* @param tables set of tables to move
* @param targetGroup name of group
*/
default void postMoveTables(final ObserverContext ctx,
Set tables, String targetGroup) throws IOException {}
/**
* Called before a new region server group is added
* @param ctx the environment to interact with the framework and master
* @param name group name
*/
default void preAddRSGroup(final ObserverContext ctx,
String name) throws IOException {}
/**
* Called after a new region server group is added
* @param ctx the environment to interact with the framework and master
* @param name group name
*/
default void postAddRSGroup(final ObserverContext ctx,
String name) throws IOException {}
/**
* Called before a region server group is removed
* @param ctx the environment to interact with the framework and master
* @param name group name
*/
default void preRemoveRSGroup(final ObserverContext ctx,
String name) throws IOException {}
/**
* Called after a region server group is removed
* @param ctx the environment to interact with the framework and master
* @param name group name
*/
default void postRemoveRSGroup(final ObserverContext ctx,
String name) throws IOException {}
/**
* Called before a region server group is removed
* @param ctx the environment to interact with the framework and master
* @param groupName group name
*/
default void preBalanceRSGroup(final ObserverContext ctx,
String groupName) throws IOException {}
/**
* Called after a region server group is removed
* @param ctx the environment to interact with the framework and master
* @param groupName group name
*/
default void postBalanceRSGroup(final ObserverContext ctx,
String groupName, boolean balancerRan) throws IOException {}
/**
* Called before servers are removed from rsgroup
* @param ctx the environment to interact with the framework and master
* @param servers set of decommissioned servers to remove
*/
default void preRemoveServers(
final ObserverContext ctx,
Set servers) throws IOException {}
/**
* Called after servers are removed from rsgroup
* @param ctx the environment to interact with the framework and master
* @param servers set of servers to remove
*/
default void postRemoveServers(
final ObserverContext ctx,
Set servers) throws IOException {}
/**
* Called before add a replication peer
* @param ctx the environment to interact with the framework and master
* @param peerId a short name that identifies the peer
* @param peerConfig configuration for the replication peer
*/
default void preAddReplicationPeer(final ObserverContext ctx,
String peerId, ReplicationPeerConfig peerConfig) throws IOException {}
/**
* Called after add a replication peer
* @param ctx the environment to interact with the framework and master
* @param peerId a short name that identifies the peer
* @param peerConfig configuration for the replication peer
*/
default void postAddReplicationPeer(final ObserverContext ctx,
String peerId, ReplicationPeerConfig peerConfig) throws IOException {}
/**
* Called before remove a replication peer
* @param ctx
* @param peerId a short name that identifies the peer
*/
default void preRemoveReplicationPeer(final ObserverContext ctx,
String peerId) throws IOException {}
/**
* Called after remove a replication peer
* @param ctx
* @param peerId a short name that identifies the peer
*/
default void postRemoveReplicationPeer(final ObserverContext ctx,
String peerId) throws IOException {}
/**
* Called before enable a replication peer
* @param ctx
* @param peerId a short name that identifies the peer
*/
default void preEnableReplicationPeer(final ObserverContext ctx,
String peerId) throws IOException {}
/**
* Called after enable a replication peer
* @param ctx
* @param peerId a short name that identifies the peer
*/
default void postEnableReplicationPeer(final ObserverContext ctx,
String peerId) throws IOException {}
/**
* Called before disable a replication peer
* @param ctx
* @param peerId a short name that identifies the peer
*/
default void preDisableReplicationPeer(final ObserverContext ctx,
String peerId) throws IOException {}
/**
* Called after disable a replication peer
* @param ctx
* @param peerId a short name that identifies the peer
*/
default void postDisableReplicationPeer(final ObserverContext ctx,
String peerId) throws IOException {}
/**
* Called before get the configured ReplicationPeerConfig for the specified peer
* @param ctx
* @param peerId a short name that identifies the peer
*/
default void preGetReplicationPeerConfig(final ObserverContext ctx,
String peerId) throws IOException {}
/**
* Called after get the configured ReplicationPeerConfig for the specified peer
* @param ctx
* @param peerId a short name that identifies the peer
*/
default void postGetReplicationPeerConfig(
final ObserverContext ctx, String peerId) throws IOException {}
/**
* Called before update peerConfig for the specified peer
* @param ctx
* @param peerId a short name that identifies the peer
*/
default void preUpdateReplicationPeerConfig(
final ObserverContext ctx, String peerId,
ReplicationPeerConfig peerConfig) throws IOException {}
/**
* Called after update peerConfig for the specified peer
* @param ctx the environment to interact with the framework and master
* @param peerId a short name that identifies the peer
*/
default void postUpdateReplicationPeerConfig(
final ObserverContext ctx, String peerId,
ReplicationPeerConfig peerConfig) throws IOException {}
/**
* Called before list replication peers.
* @param ctx the environment to interact with the framework and master
* @param regex The regular expression to match peer id
*/
default void preListReplicationPeers(final ObserverContext ctx,
String regex) throws IOException {}
/**
* Called after list replication peers.
* @param ctx the environment to interact with the framework and master
* @param regex The regular expression to match peer id
*/
default void postListReplicationPeers(final ObserverContext ctx,
String regex) throws IOException {}
/**
* Called before new LockProcedure is queued.
* @param ctx the environment to interact with the framework and master
*/
default void preRequestLock(ObserverContext ctx, String namespace,
TableName tableName, RegionInfo[] regionInfos, String description) throws IOException {}
/**
* Called after new LockProcedure is queued.
* @param ctx the environment to interact with the framework and master
*/
default void postRequestLock(ObserverContext ctx, String namespace,
TableName tableName, RegionInfo[] regionInfos, String description) throws IOException {}
/**
* Called before heartbeat to a lock.
* @param ctx the environment to interact with the framework and master
*/
default void preLockHeartbeat(ObserverContext ctx,
TableName tn, String description) throws IOException {}
/**
* Called after heartbeat to a lock.
* @param ctx the environment to interact with the framework and master
*/
default void postLockHeartbeat(ObserverContext ctx)
throws IOException {}
/**
* Called before get cluster status.
*/
default void preGetClusterMetrics(ObserverContext ctx)
throws IOException {}
/**
* Called after get cluster status.
*/
default void postGetClusterMetrics(ObserverContext ctx,
ClusterMetrics status) throws IOException {}
/**
* Called before clear dead region servers.
*/
default void preClearDeadServers(ObserverContext ctx)
throws IOException {}
/**
* Called after clear dead region servers.
*/
default void postClearDeadServers(ObserverContext ctx,
List servers, List notClearedServers)
throws IOException {}
/**
* Called before decommission region servers.
*/
default void preDecommissionRegionServers(ObserverContext ctx,
List servers, boolean offload) throws IOException {}
/**
* Called after decommission region servers.
*/
default void postDecommissionRegionServers(ObserverContext ctx,
List servers, boolean offload) throws IOException {}
/**
* Called before list decommissioned region servers.
*/
default void preListDecommissionedRegionServers(ObserverContext ctx)
throws IOException {}
/**
* Called after list decommissioned region servers.
*/
default void postListDecommissionedRegionServers(ObserverContext ctx)
throws IOException {}
/**
* Called before recommission region server.
*/
default void preRecommissionRegionServer(ObserverContext ctx,
ServerName server, List encodedRegionNames) throws IOException {}
/**
* Called after recommission region server.
*/
default void postRecommissionRegionServer(ObserverContext ctx,
ServerName server, List encodedRegionNames) throws IOException {}
/**
* Called before switching rpc throttle enabled state.
* @param ctx the coprocessor instance's environment
* @param enable the rpc throttle value
*/
default void preSwitchRpcThrottle(final ObserverContext ctx,
final boolean enable) throws IOException {
}
/**
* Called after switching rpc throttle enabled state.
* @param ctx the coprocessor instance's environment
* @param oldValue the previously rpc throttle value
* @param newValue the newly rpc throttle value
*/
default void postSwitchRpcThrottle(final ObserverContext ctx,
final boolean oldValue, final boolean newValue) throws IOException {
}
/**
* Called before getting if is rpc throttle enabled.
* @param ctx the coprocessor instance's environment
*/
default void preIsRpcThrottleEnabled(final ObserverContext ctx)
throws IOException {
}
/**
* Called after getting if is rpc throttle enabled.
* @param ctx the coprocessor instance's environment
* @param rpcThrottleEnabled the rpc throttle enabled value
*/
default void postIsRpcThrottleEnabled(final ObserverContext ctx,
final boolean rpcThrottleEnabled) throws IOException {
}
/**
* Called before switching exceed throttle quota state.
* @param ctx the coprocessor instance's environment
* @param enable the exceed throttle quota value
*/
default void preSwitchExceedThrottleQuota(final ObserverContext ctx,
final boolean enable) throws IOException {
}
/**
* Called after switching exceed throttle quota state.
* @param ctx the coprocessor instance's environment
* @param oldValue the previously exceed throttle quota value
* @param newValue the newly exceed throttle quota value
*/
default void postSwitchExceedThrottleQuota(
final ObserverContext ctx, final boolean oldValue,
final boolean newValue) throws IOException {
}
/**
* Called before granting user permissions.
* @param ctx the coprocessor instance's environment
* @param userPermission the user and permissions
* @param mergeExistingPermissions True if merge with previous granted permissions
*/
default void preGrant(ObserverContext ctx,
UserPermission userPermission, boolean mergeExistingPermissions) throws IOException {
}
/**
* Called after granting user permissions.
* @param ctx the coprocessor instance's environment
* @param userPermission the user and permissions
* @param mergeExistingPermissions True if merge with previous granted permissions
*/
default void postGrant(ObserverContext ctx,
UserPermission userPermission, boolean mergeExistingPermissions) throws IOException {
}
/**
* Called before revoking user permissions.
* @param ctx the coprocessor instance's environment
* @param userPermission the user and permissions
*/
default void preRevoke(ObserverContext ctx,
UserPermission userPermission) throws IOException {
}
/**
* Called after revoking user permissions.
* @param ctx the coprocessor instance's environment
* @param userPermission the user and permissions
*/
default void postRevoke(ObserverContext ctx,
UserPermission userPermission) throws IOException {
}
/**
* Called before getting user permissions.
* @param ctx the coprocessor instance's environment
* @param userName the user name, null if get all user permissions
* @param namespace the namespace, null if don't get namespace permission
* @param tableName the table name, null if don't get table permission
* @param family the table column family, null if don't get table family permission
* @param qualifier the table column qualifier, null if don't get table qualifier permission
* @throws IOException if something went wrong
*/
default void preGetUserPermissions(ObserverContext ctx,
String userName, String namespace, TableName tableName, byte[] family, byte[] qualifier)
throws IOException {
}
/**
* Called after getting user permissions.
* @param ctx the coprocessor instance's environment
* @param userName the user name, null if get all user permissions
* @param namespace the namespace, null if don't get namespace permission
* @param tableName the table name, null if don't get table permission
* @param family the table column family, null if don't get table family permission
* @param qualifier the table column qualifier, null if don't get table qualifier permission
* @throws IOException if something went wrong
*/
default void postGetUserPermissions(ObserverContext ctx,
String userName, String namespace, TableName tableName, byte[] family, byte[] qualifier)
throws IOException {
}
/*
* Called before checking if user has permissions.
* @param ctx the coprocessor instance's environment
* @param userName the user name
* @param permissions the permission list
*/
default void preHasUserPermissions(ObserverContext ctx,
String userName, List permissions) throws IOException {
}
/**
* Called after checking if user has permissions.
* @param ctx the coprocessor instance's environment
* @param userName the user name
* @param permissions the permission list
*/
default void postHasUserPermissions(ObserverContext ctx,
String userName, List permissions) throws IOException {
}
/**
* Called before rename rsgroup.
* @param ctx the environment to interact with the framework and master
* @param oldName old rsgroup name
* @param newName new rsgroup name
* @throws IOException on failure
*/
default void preRenameRSGroup(final ObserverContext ctx,
final String oldName, final String newName) throws IOException {
}
/**
* Called after rename rsgroup.
* @param ctx the environment to interact with the framework and master
* @param oldName old rsgroup name
* @param newName new rsgroup name
* @throws IOException on failure
*/
default void postRenameRSGroup(final ObserverContext ctx,
final String oldName, final String newName) throws IOException {
}
}