org.apache.hadoop.hive.ql.io.SymbolicInputFormat Maven / Gradle / Ivy
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* distributed with this work for additional information
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* to you under the Apache License, Version 2.0 (the
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* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.hadoop.hive.ql.io;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.common.FileUtils;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.ql.plan.MapredWork;
import org.apache.hadoop.hive.ql.plan.PartitionDesc;
import org.apache.hadoop.mapred.TextInputFormat;
public class SymbolicInputFormat implements ReworkMapredInputFormat {
public void rework(HiveConf job, MapredWork work) throws IOException {
Map pathToParts = work.getMapWork().getPathToPartitionInfo();
List toRemovePaths = new ArrayList();
Map toAddPathToPart = new HashMap();
Map> pathToAliases = work.getMapWork().getPathToAliases();
for (Map.Entry pathPartEntry : pathToParts
.entrySet()) {
String path = pathPartEntry.getKey();
PartitionDesc partDesc = pathPartEntry.getValue();
// this path points to a symlink path
if (partDesc.getInputFileFormatClass().equals(
SymlinkTextInputFormat.class)) {
// change to TextInputFormat
partDesc.setInputFileFormatClass(TextInputFormat.class);
Path symlinkDir = new Path(path);
FileSystem fileSystem = symlinkDir.getFileSystem(job);
FileStatus fStatus = fileSystem.getFileStatus(symlinkDir);
FileStatus[] symlinks = null;
if (!fStatus.isDir()) {
symlinks = new FileStatus[] { fStatus };
} else {
symlinks = fileSystem.listStatus(symlinkDir, FileUtils.HIDDEN_FILES_PATH_FILTER);
}
toRemovePaths.add(path);
ArrayList aliases = pathToAliases.remove(path);
for (FileStatus symlink : symlinks) {
BufferedReader reader = null;
try {
reader = new BufferedReader(new InputStreamReader(
fileSystem.open(symlink.getPath())));
partDesc.setInputFileFormatClass(TextInputFormat.class);
String line;
while ((line = reader.readLine()) != null) {
// no check for the line? How to check?
// if the line is invalid for any reason, the job will fail.
toAddPathToPart.put(line, partDesc);
pathToAliases.put(line, aliases);
}
} finally {
org.apache.hadoop.io.IOUtils.closeStream(reader);
}
}
}
}
pathToParts.putAll(toAddPathToPart);
for (String toRemove : toRemovePaths) {
pathToParts.remove(toRemove);
}
}
}