default void preRestoreSnapshot(final ObserverContext<MasterCoprocessorEnvironment> 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
hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/MasterObserver.java