rmdmattingly commented on code in PR #7288: URL: https://github.com/apache/hbase/pull/7288#discussion_r2333662074
########## hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/RestoreBackupSystemTableProcedure.java: ########## @@ -0,0 +1,169 @@ +/* + * 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.master.procedure; + +import java.io.IOException; +import java.util.List; +import org.apache.hadoop.hbase.HBaseIOException; +import org.apache.hadoop.hbase.TableName; +import org.apache.hadoop.hbase.client.TableDescriptor; +import org.apache.hadoop.hbase.client.TableState; +import org.apache.hadoop.hbase.procedure2.Procedure; +import org.apache.hadoop.hbase.procedure2.ProcedureSuspendedException; +import org.apache.hadoop.hbase.procedure2.ProcedureYieldException; +import org.apache.hadoop.hbase.snapshot.SnapshotDoesNotExistException; +import org.apache.yetus.audience.InterfaceAudience; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import org.apache.hadoop.hbase.shaded.protobuf.ProtobufUtil; +import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProcedureProtos.RestoreBackupSystemTableState; +import org.apache.hadoop.hbase.shaded.protobuf.generated.SnapshotProtos.SnapshotDescription; + +@InterfaceAudience.Private +public class RestoreBackupSystemTableProcedure + extends AbstractStateMachineTableProcedure<RestoreBackupSystemTableState> { + private static final Logger LOG = + LoggerFactory.getLogger(RestoreBackupSystemTableProcedure.class); + + private final SnapshotDescription snapshot; + private boolean enableOnRollback = false; + + // Necessary for the procedure framework. Do not remove. + public RestoreBackupSystemTableProcedure() { + this(null); + } + + public RestoreBackupSystemTableProcedure(SnapshotDescription snapshot) { + this.snapshot = snapshot; + } + + @Override + public TableName getTableName() { + return TableName.valueOf(snapshot.getTable()); + } + + @Override + public TableOperationType getTableOperationType() { + return TableOperationType.RESTORE_BACKUP_SYSTEM_TABLE; + } + + @Override + protected Flow executeFromState(MasterProcedureEnv env, RestoreBackupSystemTableState state) + throws ProcedureSuspendedException, ProcedureYieldException, InterruptedException { + LOG.info("{} execute state={}", this, state); + + try { + switch (state) { + case RESTORE_BACKUP_SYSTEM_TABLE_PREPARE: + prepare(env); + return moreState(RestoreBackupSystemTableState.RESTORE_BACKUP_SYSTEM_TABLE_DISABLE); + case RESTORE_BACKUP_SYSTEM_TABLE_DISABLE: + TableState tableState = + env.getMasterServices().getTableStateManager().getTableState(getTableName()); + if (tableState.isEnabled()) { + addChildProcedure(createDisableTableProcedure(env)); + } + return moreState(RestoreBackupSystemTableState.RESTORE_BACKUP_SYSTEM_TABLE_RESTORE); + case RESTORE_BACKUP_SYSTEM_TABLE_RESTORE: + addChildProcedure(createRestoreSnapshotProcedure(env)); + return moreState(RestoreBackupSystemTableState.RESTORE_BACKUP_SYSTEM_TABLE_ENABLE); + case RESTORE_BACKUP_SYSTEM_TABLE_ENABLE: + addChildProcedure(createEnableTableProcedure(env)); + return Flow.NO_MORE_STATE; Review Comment: One problem we've run into is a huge pileup of enable table procs when the backup system is broken; should this be smart enough to avoid scheduling a child proc if one already exists? Maybe it's not a problem with the parent proc's locking here, and/or maybe addChildProcedure is already smart enough to do that? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@hbase.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
