ggershinsky commented on a change in pull request #615:
URL: https://github.com/apache/parquet-mr/pull/615#discussion_r439795858



##########
File path: 
parquet-hadoop/src/main/java/org/apache/parquet/crypto/keytools/HadoopFSKeyMaterialStore.java
##########
@@ -0,0 +1,127 @@
+/*
+ * 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.parquet.crypto.keytools;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FSDataInputStream;
+import org.apache.hadoop.fs.FSDataOutputStream;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.parquet.crypto.ParquetCryptoRuntimeException;
+import org.codehaus.jackson.JsonNode;
+import org.codehaus.jackson.map.ObjectMapper;
+import org.codehaus.jackson.type.TypeReference;
+
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Set;
+
+public class HadoopFSKeyMaterialStore implements FileKeyMaterialStore {
+  
+  public final static String KEY_MATERIAL_FILE_PREFIX = "_KEY_MATERIAL_FOR_";
+  public static final String TEMP_FILE_PREFIX = "_TMP";
+  public final static String KEY_MATERIAL_FILE_SUFFFIX = ".json";
+  private static final ObjectMapper objectMapper = new ObjectMapper();
+
+  private FileSystem hadoopFileSystem;
+  private Map<String, String> keyMaterialMap;
+  private Path keyMaterialFile;
+  
+  HadoopFSKeyMaterialStore(FileSystem hadoopFileSystem) {
+    this.hadoopFileSystem = hadoopFileSystem;
+  }
+
+  @Override
+  public void initialize(Path parquetFilePath, Configuration hadoopConfig, 
boolean tempStore) {
+    String fullPrefix = (tempStore? TEMP_FILE_PREFIX : "");
+    fullPrefix += KEY_MATERIAL_FILE_PREFIX;
+    keyMaterialFile = new Path(parquetFilePath.getParent(),
+      fullPrefix + parquetFilePath.getName() + KEY_MATERIAL_FILE_SUFFFIX);
+  }
+
+  @Override
+  public void addKeyMaterial(String keyIDInFile, String keyMaterial) throws 
ParquetCryptoRuntimeException {
+    if (null == keyMaterialMap) {
+      keyMaterialMap = new HashMap<>();
+    }
+    keyMaterialMap.put(keyIDInFile, keyMaterial);
+  }
+
+  @Override
+  public String getKeyMaterial(String keyIDInFile)  throws 
ParquetCryptoRuntimeException {
+    if (null == keyMaterialMap) {
+      loadKeyMaterialMap();
+    }
+    return keyMaterialMap.get(keyIDInFile);
+  }
+  
+  private void loadKeyMaterialMap() {
+    try (FSDataInputStream keyMaterialStream = 
hadoopFileSystem.open(keyMaterialFile)) {
+      JsonNode keyMaterialJson = objectMapper.readTree(keyMaterialStream);
+      keyMaterialMap = objectMapper.readValue(keyMaterialJson,
+        new TypeReference<Map<String, String>>() { });
+    } catch (IOException e) {
+      throw new ParquetCryptoRuntimeException("Failed to get key material from 
" + keyMaterialFile, e);
+    }
+  }
+
+  @Override
+  public void saveMaterial() throws ParquetCryptoRuntimeException {
+    // TODO needed? Path qualifiedPath = 
parquetFilePath.makeQualified(hadoopFileSystem);

Review comment:
       will remove the comment.




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