/**
* 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.hadoop.hive.cli;
import java.io.BufferedOutputStream;
import java.io.FileDescriptor;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CodingErrorAction;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.ql.io.RCFileRecordReader;
import org.apache.hadoop.hive.serde2.columnar.BytesRefArrayWritable;
import org.apache.hadoop.hive.serde2.columnar.BytesRefWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.FileSplit;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
public class RCFileCat implements Tool{
// Size of string buffer in bytes
private static final int STRING_BUFFER_SIZE = 16 * 1024;
// The size to flush the string buffer at
private static final int STRING_BUFFER_FLUSH_SIZE = 14 * 1024;
// Size of stdout buffer in bytes
private static final int STDOUT_BUFFER_SIZE = 128 * 1024;
// In verbose mode, print an update per RECORD_PRINT_INTERVAL records
private static final int RECORD_PRINT_INTERVAL = (1024*1024);
public RCFileCat() {
super();
decoder = Charset.forName("UTF-8").newDecoder().
onMalformedInput(CodingErrorAction.REPLACE).
onUnmappableCharacter(CodingErrorAction.REPLACE);
}
private static CharsetDecoder decoder;
Configuration conf = null;
private static String TAB ="\t";
private static String NEWLINE ="\r\n";
@Override
public int run(String[] args) throws Exception {
long start = 0l;
long length = -1l;
int recordCount = 0;
long startT = System.currentTimeMillis();
boolean verbose = false;
//get options from arguments
if (args.length < 1 || args.length > 3) {
printUsage(null);
}
Path fileName = null;
for (int i = 0; i < args.length; i++) {
String arg = args[i];
if(arg.startsWith("--start=")) {
start = Long.parseLong(arg.substring("--start=".length()));
} else if (arg.startsWith("--length=")) {
length = Long.parseLong(arg.substring("--length=".length()));
} else if (arg.equals("--verbose")) {
verbose = true;
} else if (fileName == null){
fileName = new Path(arg);
} else {
printUsage(null);
}
}
setupBufferedOutput();
FileSystem fs = FileSystem.get(fileName.toUri(), conf);
long fileLen = fs.getFileStatus(fileName).getLen();
if (start < 0) {
start = 0;
}
if (start > fileLen) {
return 0;
}
if (length < 0 || (start + length) > fileLen) {
length = fileLen - start;
}
//share the code with RecordReader.
FileSplit split = new FileSplit(fileName,start, length, new JobConf(conf));
RCFileRecordReader recordReader = new RCFileRecordReader(conf, split);
LongWritable key = new LongWritable();
BytesRefArrayWritable value = new BytesRefArrayWritable();
StringBuilder buf = new StringBuilder(STRING_BUFFER_SIZE); // extra capacity in case we overrun, to avoid resizing
while (recordReader.next(key, value)) {
printRecord(value, buf);
recordCount++;
if (verbose && (recordCount % RECORD_PRINT_INTERVAL) == 0) {
long now = System.currentTimeMillis();
System.err.println("Read " + recordCount/1024 + "k records");
System.err.println("Read " + ((recordReader.getPos() / (1024L*1024L)))
+ "MB");
System.err.printf("Input scan rate %.2f MB/s\n",
(recordReader.getPos() * 1.0 / (now - startT)) / 1024.0);
}
if (buf.length() > STRING_BUFFER_FLUSH_SIZE) {
System.out.print(buf.toString());
buf.setLength(0);
}
}
// print out last part of buffer
System.out.print(buf.toString());
System.out.flush();
return 0;
}
/**
* Print record to string builder
* @param value
* @param buf
* @throws IOException
*/
private void printRecord(BytesRefArrayWritable value, StringBuilder buf)
throws IOException {
int n = value.size();
if (n > 0) {
BytesRefWritable v = value.unCheckedGet(0);
ByteBuffer bb = ByteBuffer.wrap(v.getData(), v.getStart(), v.getLength());
buf.append(decoder.decode(bb));
for (int i = 1; i < n; i++) {
// do not put the TAB for the last column
buf.append(RCFileCat.TAB);
v = value.unCheckedGet(i);
bb = ByteBuffer.wrap(v.getData(), v.getStart(), v.getLength());
buf.append(decoder.decode(bb));
}
buf.append(RCFileCat.NEWLINE);
}
}
@Override
public Configuration getConf() {
return conf;
}
@Override
public void setConf(Configuration conf) {
this.conf = conf;
}
private static String Usage = "RCFileCat [--start=start_offet] [--length=len] [--verbose] fileName";
public static void main(String[] args) {
try {
Configuration conf = new Configuration();
RCFileCat instance = new RCFileCat();
instance.setConf(conf);
ToolRunner.run(instance, args);
} catch (Exception e) {
e.printStackTrace();
System.err.println("\n\n\n");
printUsage(e.getMessage());
}
}
private static void setupBufferedOutput() {
FileOutputStream fdout =
new FileOutputStream(FileDescriptor.out);
BufferedOutputStream bos =
new BufferedOutputStream(fdout, STDOUT_BUFFER_SIZE);
PrintStream ps =
new PrintStream(bos, false);
System.setOut(ps);
}
private static void printUsage(String errorMsg) {
System.err.println(Usage);
if(errorMsg != null) {
System.err.println(errorMsg);
}
System.exit(1);
}
}