http://git-wip-us.apache.org/repos/asf/hive/blob/133d3c47/standalone-metastore/src/main/java/org/apache/hadoop/hive/metastore/MetadataStore.java
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a/standalone-metastore/src/main/java/org/apache/hadoop/hive/metastore/MetadataStore.java
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+/*
+ * 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.hive.metastore;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.util.List;
+
+public interface MetadataStore {
+ /**
+ * @param fileIds file ID list.
+ * @param result The ref parameter, used to return the serialized file
metadata.
+ */
+ void getFileMetadata(List<Long> fileIds, ByteBuffer[] result) throws
IOException;
+
+ /**
+ * @param fileIds file ID list.
+ * @param metadataBuffers Serialized file metadata, one per file ID.
+ * @param addedCols The column names for additional columns created by
file-format-specific
+ * metadata handler, to be stored in the cache.
+ * @param addedVals The values for addedCols; one value per file ID per
added column.
+ */
+ void storeFileMetadata(List<Long> fileIds, List<ByteBuffer> metadataBuffers,
+ ByteBuffer[] addedCols, ByteBuffer[][] addedVals) throws IOException,
InterruptedException;
+
+ /**
+ * @param fileId The file ID.
+ * @param metadata Serialized file metadata.
+ * @param addedCols The column names for additional columns created by
file-format-specific
+ * metadata handler, to be stored in the cache.
+ * @param addedVals The values for addedCols; one value per added column.
+ */
+ void storeFileMetadata(long fileId, ByteBuffer metadata, ByteBuffer[]
addedCols,
+ ByteBuffer[] addedVals) throws IOException, InterruptedException;
+
+}
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