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/*
* Licensed to Metamarkets Group Inc. (Metamarkets) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Metamarkets 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 io.druid.indexer;
import com.fasterxml.jackson.databind.ObjectMapper;
import io.druid.jackson.DefaultObjectMapper;
import io.druid.java.util.common.jackson.JacksonUtils;
import io.druid.java.util.common.ISE;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.compress.CompressionCodec;
import org.apache.hadoop.io.compress.GzipCodec;
import org.apache.hadoop.mapreduce.JobContext;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.ReflectionUtils;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Map;
/**
*/
public class Utils
{
private static final ObjectMapper jsonMapper = new DefaultObjectMapper();
public static OutputStream makePathAndOutputStream(JobContext job, Path outputPath, boolean deleteExisting)
throws IOException
{
OutputStream retVal;
FileSystem fs = outputPath.getFileSystem(job.getConfiguration());
Class codecClass;
CompressionCodec codec = null;
if (FileOutputFormat.getCompressOutput(job)) {
codecClass = FileOutputFormat.getOutputCompressorClass(job, GzipCodec.class);
codec = ReflectionUtils.newInstance(codecClass, job.getConfiguration());
outputPath = new Path(outputPath.toString() + codec.getDefaultExtension());
}
if (fs.exists(outputPath)) {
if (deleteExisting) {
fs.delete(outputPath, false);
} else {
throw new ISE("outputPath[%s] must not exist.", outputPath);
}
}
if (FileOutputFormat.getCompressOutput(job)) {
retVal = codec.createOutputStream(fs.create(outputPath, false));
} else {
retVal = fs.create(outputPath, false);
}
return retVal;
}
public static InputStream openInputStream(JobContext job, Path inputPath) throws IOException
{
return openInputStream(job, inputPath, inputPath.getFileSystem(job.getConfiguration()));
}
public static boolean exists(JobContext job, FileSystem fs, Path inputPath) throws IOException
{
if (!FileOutputFormat.getCompressOutput(job)) {
return fs.exists(inputPath);
} else {
Class codecClass = FileOutputFormat.getOutputCompressorClass(job, GzipCodec.class);
CompressionCodec codec = ReflectionUtils.newInstance(codecClass, job.getConfiguration());
return fs.exists(new Path(inputPath.toString() + codec.getDefaultExtension()));
}
}
public static InputStream openInputStream(JobContext job, Path inputPath, final FileSystem fileSystem)
throws IOException
{
if (!FileOutputFormat.getCompressOutput(job)) {
return fileSystem.open(inputPath);
} else {
Class codecClass = FileOutputFormat.getOutputCompressorClass(job, GzipCodec.class);
CompressionCodec codec = ReflectionUtils.newInstance(codecClass, job.getConfiguration());
inputPath = new Path(inputPath.toString() + codec.getDefaultExtension());
return codec.createInputStream(fileSystem.open(inputPath));
}
}
public static Map getStats(JobContext job, Path statsPath)
throws IOException
{
FileSystem fs = statsPath.getFileSystem(job.getConfiguration());
return jsonMapper.readValue(
fs.open(statsPath),
JacksonUtils.TYPE_REFERENCE_MAP_STRING_OBJECT
);
}
public static void storeStats(
JobContext job, Path path, Map stats
) throws IOException
{
jsonMapper.writeValue(
makePathAndOutputStream(job, path, true),
stats
);
}
}