Initial pass at KeySpacePath.importData

Author: ScottDugas

fdb-record-layer-core/src/main/java/com/apple/foundationdb/record/provider/foundationdb/keyspace/KeySpacePath.java

@@ -603,4 +603,21 @@ default RecordCursor<DataInKeySpacePath> exportAllData(@Nonnull FDBRecordContext
                                                            @Nonnull ScanProperties scanProperties) {
         throw new UnsupportedOperationException("exportAllData is not supported");
     }
+
+    /**
+     * Imports the provided data exported via {@link #exportAllData} into this {@code KeySpacePath}.
+     * This will validate that any data provided in {@code dataToImport} has a path that should be in this path,
+     * or one of the sub-directories, if not the future will complete exceptionally with
+     * {@link RecordCoreIllegalImportDataException}.
+     * If there is any data already existing under this path, the new data will overwrite if the keys are the same.
+     * This will use the logical value in the {@link DataInKeySpacePath#getResolvedPath()} to determine the key, rather
+     * than the raw key, meaning that this will work even if the data was exported from a different cluster.
+     * @param context the transaction context in which to save the data
+     * @param dataToImport the data to be saved to the database
+     * @return a future to be completed once all data has been important.
+     */
+    @API(API.Status.EXPERIMENTAL)
+    @Nonnull
+    CompletableFuture<Void> importData(@Nonnull FDBRecordContext context,
+                                       @Nonnull Iterable<DataInKeySpacePath> dataToImport);
 }

fdb-record-layer-core/src/main/java/com/apple/foundationdb/record/provider/foundationdb/keyspace/KeySpacePathImpl.java

@@ -386,6 +386,43 @@ public RecordCursor<DataInKeySpacePath> exportAllData(@Nonnull FDBRecordContext
                 .map(keyValue -> new DataInKeySpacePath(this, keyValue, context));
     }
 
+    @Nonnull
+    @Override
+    public CompletableFuture<Void> importData(@Nonnull FDBRecordContext context,
+                                              @Nonnull Iterable<DataInKeySpacePath> dataToImport) {
+        return toTupleAsync(context).thenCompose(targetTuple -> {
+            List<CompletableFuture<Void>> importFutures = new ArrayList<>();
+            
+            for (DataInKeySpacePath dataItem : dataToImport) {
+                CompletableFuture<Void> importFuture = dataItem.getResolvedPath().thenCompose(resolvedPath -> {
+                    // Validate that this data belongs under this path
+                    Tuple itemTuple = resolvedPath.toTuple();
+                    if (!TupleHelpers.isPrefix(targetTuple, itemTuple)) {
+                        throw new RecordCoreIllegalImportDataException(
+                                "Data item path does not belong under target path",
+                                "target", targetTuple, "item", itemTuple);
+                    }
+                    
+                    // Reconstruct the key using logical values from the resolved path
+                    Tuple keyTuple = itemTuple;
+                    if (resolvedPath.getRemainder() != null) {
+                        keyTuple = keyTuple.addAll(resolvedPath.getRemainder());
+                    }
+                    
+                    // Store the data
+                    byte[] keyBytes = keyTuple.pack();
+                    byte[] valueBytes = dataItem.getRawKeyValue().getValue();
+                    context.ensureActive().set(keyBytes, valueBytes);
+                    
+                    return AsyncUtil.DONE;
+                });
+                importFutures.add(importFuture);
+            }
+            
+            return AsyncUtil.whenAll(importFutures);
+        });
+    }
+
     /**
      * Returns this path properly wrapped in whatever implementation the directory the path is contained in dictates.
      */

fdb-record-layer-core/src/main/java/com/apple/foundationdb/record/provider/foundationdb/keyspace/KeySpacePathWrapper.java

@@ -239,4 +239,11 @@ public RecordCursor<DataInKeySpacePath> exportAllData(@Nonnull FDBRecordContext
                                                           @Nonnull ScanProperties scanProperties) {
         return inner.exportAllData(context, continuation, scanProperties);
     }
+
+    @Nonnull
+    @Override
+    public CompletableFuture<Void> importData(@Nonnull FDBRecordContext context,
+                                              @Nonnull Iterable<DataInKeySpacePath> dataToImport) {
+        return inner.importData(context, dataToImport);
+    }
 }

fdb-record-layer-core/src/main/java/com/apple/foundationdb/record/provider/foundationdb/keyspace/RecordCoreIllegalImportDataException.java

@@ -0,0 +1,33 @@
+/*
+ * RecordCoreIllegalImportDataException.java
+ *
+ * This source file is part of the FoundationDB open source project
+ *
+ * Copyright 2015-2025 Apple Inc. and the FoundationDB project authors
+ *
+ * Licensed 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 com.apple.foundationdb.record.provider.foundationdb.keyspace;
+
+import com.apple.foundationdb.record.RecordCoreArgumentException;
+
+import javax.annotation.Nonnull;
+
+public class RecordCoreIllegalImportDataException extends RecordCoreArgumentException {
+    private static final long serialVersionUID = 1L;
+    
+    public RecordCoreIllegalImportDataException(@Nonnull final String msg, @Nonnull final Object... keyValue) {
+        super(msg, keyValue);
+    }
+}