| /* |
| * 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; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.hive.metastore.api.FileMetadataExprType; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * The base implementation of a file metadata handler for a specific file type. |
| * There are currently two classes for each file type (of 1), this one, which is very simple due |
| * to the fact that it just calls the proxy class for most calls; and the proxy class, that |
| * contains the actual implementation that depends on some stuff in QL (for ORC). |
| */ |
| public abstract class FileMetadataHandler { |
| protected static final Logger LOG = LoggerFactory.getLogger(FileMetadataHandler.class); |
| |
| protected Configuration conf; |
| private PartitionExpressionProxy expressionProxy; |
| private FileFormatProxy fileFormatProxy; |
| private MetadataStore store; |
| |
| /** |
| * Same as RawStore.getFileMetadataByExpr. |
| */ |
| public abstract void getFileMetadataByExpr(List<Long> fileIds, byte[] expr, |
| ByteBuffer[] metadatas, ByteBuffer[] results, boolean[] eliminated) throws IOException; |
| |
| protected abstract FileMetadataExprType getType(); |
| |
| protected PartitionExpressionProxy getExpressionProxy() { |
| return expressionProxy; |
| } |
| |
| protected FileFormatProxy getFileFormatProxy() { |
| return fileFormatProxy; |
| } |
| |
| protected MetadataStore getStore() { |
| return store; |
| } |
| |
| /** |
| * Configures the handler. Called once before use. |
| * @param conf Config. |
| * @param expressionProxy Expression proxy to access ql stuff. |
| * @param store Storage interface to manipulate the metadata. |
| */ |
| public void configure( |
| Configuration conf, PartitionExpressionProxy expressionProxy, MetadataStore store) { |
| this.conf = conf; |
| this.expressionProxy = expressionProxy; |
| this.store = store; |
| this.fileFormatProxy = expressionProxy.getFileFormatProxy(getType()); |
| } |
| |
| /** |
| * Caches the file metadata for a particular file. |
| * @param fileId File id. |
| * @param fs The filesystem of the file. |
| * @param path Path to the file. |
| */ |
| public void cacheFileMetadata(long fileId, FileSystem fs, Path path) |
| throws IOException, InterruptedException { |
| // ORC is in ql, so we cannot do anything here. For now, all the logic is in the proxy. |
| ByteBuffer[] cols = fileFormatProxy.getAddedColumnsToCache(); |
| ByteBuffer[] vals = (cols == null) ? null : new ByteBuffer[cols.length]; |
| ByteBuffer metadata = fileFormatProxy.getMetadataToCache(fs, path, vals); |
| LOG.info("Caching file metadata for " + path + ", size " + metadata.remaining()); |
| store.storeFileMetadata(fileId, metadata, cols, vals); |
| } |
| |
| /** |
| * @return the added column names to be cached in metastore with the metadata for this type. |
| */ |
| public ByteBuffer[] createAddedCols() { |
| return fileFormatProxy.getAddedColumnsToCache(); |
| } |
| |
| /** |
| * @return the values for the added columns returned by createAddedCols for respective metadatas. |
| */ |
| public ByteBuffer[][] createAddedColVals(List<ByteBuffer> metadata) { |
| return fileFormatProxy.getAddedValuesToCache(metadata); |
| } |
| } |