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OrcAcidUtils.java
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92 lines (83 loc) · 2.95 KB
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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.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;
import java.nio.charset.StandardCharsets;
/**
* @since 1.1.0
*/
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 = StandardCharsets.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;
}
}
}