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ArcCounter.java
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Created
Sat, Aug 31, 01:13
Size
4 KB
Mime Type
text/x-java
Expires
Mon, Sep 2, 01:13 (2 d)
Engine
blob
Format
Raw Data
Handle
20338475
Attached To
R1473 warcbase
ArcCounter.java
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package
org.warcbase.analysis
;
import
java.io.IOException
;
import
java.util.Iterator
;
import
org.apache.commons.cli.CommandLine
;
import
org.apache.commons.cli.CommandLineParser
;
import
org.apache.commons.cli.GnuParser
;
import
org.apache.commons.cli.HelpFormatter
;
import
org.apache.commons.cli.OptionBuilder
;
import
org.apache.commons.cli.Options
;
import
org.apache.commons.cli.ParseException
;
import
org.apache.hadoop.conf.Configured
;
import
org.apache.hadoop.fs.FileSystem
;
import
org.apache.hadoop.fs.Path
;
import
org.apache.hadoop.io.IntWritable
;
import
org.apache.hadoop.io.LongWritable
;
import
org.apache.hadoop.io.Text
;
import
org.apache.hadoop.mapreduce.Job
;
import
org.apache.hadoop.mapreduce.Mapper
;
import
org.apache.hadoop.mapreduce.Reducer
;
import
org.apache.hadoop.mapreduce.lib.input.FileInputFormat
;
import
org.apache.hadoop.mapreduce.lib.output.FileOutputFormat
;
import
org.apache.hadoop.mapreduce.lib.output.TextOutputFormat
;
import
org.apache.hadoop.util.Tool
;
import
org.apache.hadoop.util.ToolRunner
;
import
org.apache.log4j.Logger
;
import
org.jwat.arc.ArcRecordBase
;
import
org.warcbase.mapreduce.JwatArcInputFormat
;
public
class
ArcCounter
extends
Configured
implements
Tool
{
private
static
final
Logger
LOG
=
Logger
.
getLogger
(
ArcCounter
.
class
);
private
static
class
MyReducer
extends
Reducer
<
Text
,
IntWritable
,
Text
,
IntWritable
>
{
private
final
static
IntWritable
SUM
=
new
IntWritable
();
@Override
public
void
reduce
(
Text
key
,
Iterable
<
IntWritable
>
values
,
Context
context
)
throws
IOException
,
InterruptedException
{
Iterator
<
IntWritable
>
iter
=
values
.
iterator
();
int
sum
=
0
;
while
(
iter
.
hasNext
())
{
sum
+=
iter
.
next
().
get
();
}
SUM
.
set
(
sum
);
context
.
write
(
key
,
SUM
);
}
}
private
final
Class
<?
extends
Mapper
<
LongWritable
,
ArcRecordBase
,
Text
,
IntWritable
>>
mapperClass
;
public
ArcCounter
(
Class
<?
extends
Mapper
<
LongWritable
,
ArcRecordBase
,
Text
,
IntWritable
>>
mapperClass
)
{
this
.
mapperClass
=
mapperClass
;
}
public
static
final
String
INPUT_OPTION
=
"input"
;
public
static
final
String
OUTPUT_OPTION
=
"output"
;
/**
* Runs this tool.
*/
@SuppressWarnings
(
"static-access"
)
public
int
run
(
String
[]
args
)
throws
Exception
{
Options
options
=
new
Options
();
options
.
addOption
(
OptionBuilder
.
withArgName
(
"path"
).
hasArg
()
.
withDescription
(
"input path"
).
create
(
INPUT_OPTION
));
options
.
addOption
(
OptionBuilder
.
withArgName
(
"path"
).
hasArg
()
.
withDescription
(
"output path"
).
create
(
OUTPUT_OPTION
));
CommandLine
cmdline
;
CommandLineParser
parser
=
new
GnuParser
();
try
{
cmdline
=
parser
.
parse
(
options
,
args
);
}
catch
(
ParseException
exp
)
{
HelpFormatter
formatter
=
new
HelpFormatter
();
formatter
.
printHelp
(
this
.
getClass
().
getName
(),
options
);
ToolRunner
.
printGenericCommandUsage
(
System
.
out
);
System
.
err
.
println
(
"Error parsing command line: "
+
exp
.
getMessage
());
return
-
1
;
}
if
(!
cmdline
.
hasOption
(
INPUT_OPTION
)
||
!
cmdline
.
hasOption
(
OUTPUT_OPTION
))
{
HelpFormatter
formatter
=
new
HelpFormatter
();
formatter
.
printHelp
(
this
.
getClass
().
getName
(),
options
);
ToolRunner
.
printGenericCommandUsage
(
System
.
out
);
return
-
1
;
}
String
input
=
cmdline
.
getOptionValue
(
INPUT_OPTION
);
Path
output
=
new
Path
(
cmdline
.
getOptionValue
(
OUTPUT_OPTION
));
LOG
.
info
(
"Tool name: "
+
CountArcContentTypes
.
class
.
getSimpleName
());
LOG
.
info
(
" - input: "
+
input
);
LOG
.
info
(
" - output: "
+
output
);
Job
job
=
Job
.
getInstance
(
getConf
(),
CountArcContentTypes
.
class
.
getSimpleName
()
+
":"
+
input
);
job
.
setJarByClass
(
CountArcContentTypes
.
class
);
job
.
setNumReduceTasks
(
1
);
FileInputFormat
.
addInputPaths
(
job
,
input
);
FileOutputFormat
.
setOutputPath
(
job
,
output
);
job
.
setOutputKeyClass
(
Text
.
class
);
job
.
setOutputValueClass
(
IntWritable
.
class
);
job
.
setInputFormatClass
(
JwatArcInputFormat
.
class
);
job
.
setOutputFormatClass
(
TextOutputFormat
.
class
);
job
.
setMapperClass
(
mapperClass
);
job
.
setCombinerClass
(
MyReducer
.
class
);
job
.
setReducerClass
(
MyReducer
.
class
);
FileSystem
fs
=
FileSystem
.
get
(
getConf
());
if
(
FileSystem
.
get
(
getConf
()).
exists
(
output
))
{
fs
.
delete
(
output
,
true
);
}
job
.
waitForCompletion
(
true
);
return
0
;
}
}
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