/**
* Copyright 2013 Netflix, Inc.
*
* Licensed 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 com.netflix.aegisthus.input.readers;
import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.IOError;
import java.io.IOException;
import java.io.InputStream;
import org.apache.cassandra.io.sstable.Descriptor;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import com.netflix.aegisthus.input.AegSplit;
import com.netflix.aegisthus.io.commitlog.CommitLogScanner;
public class CommitLogRecordReader extends AegisthusRecordReader {
protected CommitLogScanner scanner;
protected int cfId;
@Override
public void close() throws IOException {
super.close();
if (scanner != null) {
scanner.close();
}
}
@Override
public void initialize(InputSplit inputSplit, TaskAttemptContext ctx) throws IOException, InterruptedException {
AegSplit split = (AegSplit) inputSplit;
start = split.getStart();
end = split.getEnd();
final Path file = split.getPath();
try {
cfId = ctx.getConfiguration().getInt("commitlog.cfid", -1000);
if (cfId == -1000) {
throw new IOException("commitlog.cfid must be set");
}
// open the file and seek to the start of the split
FileSystem fs = file.getFileSystem(ctx.getConfiguration());
FSDataInputStream fileIn = fs.open(split.getPath());
InputStream dis = new BufferedInputStream(fileIn);
scanner = new CommitLogScanner(new DataInputStream(dis), split.getConvertors(),
Descriptor.fromFilename(split.getPath().getName()).version);
this.pos = start;
} catch (IOException e) {
throw new IOError(e);
}
}
@Override
public boolean nextKeyValue() throws IOException, InterruptedException {
String line = scanner.next();
if (line == null) {
return false;
}
pos += scanner.getDatasize();
String[] text = line.split("\t", 2);
if (text[0].charAt(0) == '{') {
text[0] = text[0].substring(2, text[0].length() - 1);
}
key.set(text[0]);
value.set(text[1]);
return true;
}
}