| /** |
| * 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 |
| * <p/> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p/> |
| * 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.orc.impl; |
| |
| import org.apache.hadoop.fs.FSDataInputStream; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.orc.Reader; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.nio.charset.CharacterCodingException; |
| import java.nio.charset.Charset; |
| import java.nio.charset.CharsetDecoder; |
| |
| public class OrcAcidUtils { |
| public static final String ACID_STATS = "hive.acid.stats"; |
| public static final String DELTA_SIDE_FILE_SUFFIX = "_flush_length"; |
| |
| /** |
| * Get the filename of the ORC ACID side file that contains the lengths |
| * of the intermediate footers. |
| * @param main the main ORC filename |
| * @return the name of the side file |
| */ |
| public static Path getSideFile(Path main) { |
| return new Path(main + DELTA_SIDE_FILE_SUFFIX); |
| } |
| |
| /** |
| * Read the side file to get the last flush length. |
| * @param fs the file system to use |
| * @param deltaFile the path of the delta file |
| * @return the maximum size of the file to use |
| * @throws IOException |
| */ |
| public static long getLastFlushLength(FileSystem fs, |
| Path deltaFile) throws IOException { |
| Path lengths = getSideFile(deltaFile); |
| long result = Long.MAX_VALUE; |
| if(!fs.exists(lengths)) { |
| return result; |
| } |
| try (FSDataInputStream stream = fs.open(lengths)) { |
| result = -1; |
| while (stream.available() > 0) { |
| result = stream.readLong(); |
| } |
| return result; |
| } catch (IOException ioe) { |
| return result; |
| } |
| } |
| |
| private static final Charset utf8 = Charset.forName("UTF-8"); |
| private static final CharsetDecoder utf8Decoder = utf8.newDecoder(); |
| |
| public static AcidStats parseAcidStats(Reader reader) { |
| if (reader.hasMetadataValue(ACID_STATS)) { |
| try { |
| ByteBuffer val = reader.getMetadataValue(ACID_STATS).duplicate(); |
| return new AcidStats(utf8Decoder.decode(val).toString()); |
| } catch (CharacterCodingException e) { |
| throw new IllegalArgumentException("Bad string encoding for " + |
| ACID_STATS, e); |
| } |
| } else { |
| return null; |
| } |
| } |
| |
| } |