Master's thesis, TU Kaiserslautern, August 2012 http://code.google.com/p/marimba-framework

1. A MapReduce-based
Programming Model for
Self-maintainable Aggregate Views
2012-08-31
Johannes Schildgen
TU Kaiserslautern
schildgen@cs.uni-kl.de

2. Motivation

3. 11 26 14 23 37
39 41 26
19 8
25
19 22 15 18 10 16
27
8 9 12 14 15

4. Kinderriegel: 26
Balisto: 39
Hanuta: 14
Snickers: 19
Ritter Sport: 41
Pickup: 12
…

5. Kinderriegel: 26
Balisto: 39
Hanuta: 14
Snickers: 19
Ritter Sport: 41
Pickup: 12
…

6. Kinderriegel: 26
Balisto: 39
Hanuta: 14
Snickers: 19
Ritter Sport: 41
Δ
Balisto: -1
Pickup: 12
…

7. Kinderriegel: 26
Balisto: 39
Hanuta: 14
Snickers: 19
Ritter Sport: 41
Δ
Balisto: -8
Pickup: 12 Snickers: +24
… Ritter Sport: -7

8. Increment Installation
Kinderriegel: 26
Balisto: 31
Hanuta: 14
Snickers: 43
Ritter Sport: 34
Δ
Balisto: -8
Pickup: 12 Snickers: +24
… Ritter Sport: -7

9. Overwrite Installation
Kinderriegel: 26
Balisto: 39
Hanuta: 14
Snickers: 19
Δ
Balisto: -8
Ritter Sport: 41Kinderriegel: 26
Pickup: 12 Balisto: 31 Snickers: +24
Hanuta: 14 Ritter Sport: -7
… Snickers: 43
Ritter Sport: 34
Pickup: 12

12. Fundamentals &
The Marimba Framework Evaluation
Related Work

16. public class WordCount extends Configured implements Tool {
public static class WordCountMapper extends
Mapper<LongWritable, Text, ImmutableBytesWritable,
LongWritable> {
private Text word = new Text();
@Override
public void map(LongWritable key, Text value, Context context)
throws IOException, InterruptedException {
String line = value.toString();
StringTokenizer tokenizer = new StringTokenizer(line);
while (tokenizer.hasMoreTokens()) {
this.word.set(tokenizer.nextToken());

17. A A E
B E F
C F B
D C D

18. > create 'person', 'default'
> put 'person', 'p27', 'default:forename', 'Anton'
> put 'person', 'p27', 'default:surname', 'Schmidt'
> get 'person', 'p27'
COLUMN CELL
default:forname timestamp=1338991497408, value=Schmidt
default:surname timestamp=1338991436688, value=Anton
2 row(s) in 0.0640 seconds

19. banane
die
iss
nimm
3
4
1
1
Δ
kaufe 1
schale 1
die 0
schäle 1
banane 1
schmeiß 1
schmeiß -1
weg 1
schale -1
weg -1

20. banane
die
iss
kaufe
nimm
4
4
1
1
1
Δ
kaufe 1
increment()
schale 0 die 0
schäle 1 banane 1
schmeiß 0 schmeiß -1
weg 0 schale -1
weg -1

21. banane
die
iss
nimm
3
4
1
1
Δ
kaufe 1
schale 1 overwrite() die 0
schäle 1
banane 1
schmeiß 1
schmeiß -1
weg 1
schale -1
weg -1

22. banane
die
iss
kaufe
nimm
4
4
1
1
1
Δ
kaufe 1
schale 0 overwrite() die 0
schäle 1 banane 1
schmeiß 0 schmeiß -1
weg 0 schale -1
weg -1

23. void map(key, value) {
if(value is inserted) {
for(word : value.split(" ")) {
write(word, 1);
}
else if(value is deleted) {
for(word : value.split(" ")) {
write(word, -1);
}
}
}

24. void map(key, value) {
if(value is inserted) {
for(word : value.split(" ")) {
write(word, 1);
}
else if(value is deleted) {
for(word : value.split(" ")) {
write(word, -1);
}
}
else { // old result
write(key, value);
}
}

25. Overwrite Installation
void reduce(key, values) {
sum = 0;
for(value : value) {
sum += value;
}
put = new Put(key);
put.add("fam", "col", sum);
context.write(key, put);
}

26. Increment Installation
void reduce(key, values) {
sum = 0;
for(value : value) {
sum += value;
}
inc = new Increment(key);
inc.add("fam", "col", sum);
context.write(key, inc);
}

27. Formalization

28. Formalization

29. Generic Mapper

30. Generic Reducer

31. Fundamentals &
The Marimba Framework Evaluation
Related Work

32. Core functionality:
Distributed computations
with MapReduce
I care about:
IncDec, Overwrite,
reading old results,
producing of Increments,…
I tell you how to
read input data,
Core functionality: aggregate, invert and
write the output
Incremental computations

33. public class WordTranslator extends
Translator<LongWritable, Text> {
public void translate(…) {
…
}
IncJob job = new IncJobOverwrite(conf);
job.setTranslatorClass(
WordTranslator.class);
job.setAbelianClass(WordAbelian.class);

34. public class WordAbelian implements
Abelian<WordAbelian> {
WordAbelian invert() { … }
WordAbelian aggregate(WordAbelian
other) { … }
WordAbelian neutral() { … }
boolean isNeutral() { … }
Writable extractKey() { … }
void write(…) { … }
void readFields(…) { … }
}

35. public class WordSerializer
implements Serializer<WordAbelian> {
Writable serialize(Writable key,
WordAbelian v) {
…
}
WordAbelian deserializeHBase(
byte[] rowId, byte[] colFamily,
byte[] qualifier, byte[] value) {
…
}
}

36. How To Write A Marimba-Job
1. Abelian-Class
2. Translator-Class
3. Serializer-Class
4. Write a Hadoop-Job and use the
class IncJob

37. Implementation
setInputTable(…)
IncJob setOutputTable(…)
IncJobFull
IncJobIncDec IncJobOverwrite
Recomputation
setResultInputTable(…)

38. NeutralOutputStrategy
(for IncJobOverwrite)

39. public interface Abelian<T extends
Abelian<?>> extends
WritableComparable<BinaryComparable>{
T invert();
T aggregate(T other);
T neutral();
boolean isNeutral();
Writable extractKey();
void write(…);
void readFields(…);
}

40. public interface Serialzer<T extends
Abelian<?>> {
Writable serialize(T obj);
T deserializeHBase(
byte[] rowId, byte[] colFamily,
byte[] qualifier, byte[] value);
}

41. public abstract class Translator
<KEYIN, VALUEIN> {
public abstract void translate
(KEYIN key, VALUEIN value,
Context context);
this.mapContext.write(
abelianValue.extractKey(),
this.invertValue ?
abelianValue.invert() :
abelianValue);

42. GenericMapper
From InputFormat: Value
OverwriteResult InsertedValue DeletedValue PreservedValue
deserialize translate set invertValue=true; ignore
translate

43. GenericReducer
1. aggregate
2. serialize
3. write
IncDec: Overwrite:
PUT → write
putToIncrement(…) IGNORE → don‘t write
DELETE → putToDelete(...)

44. GenericCombiner
„Write A Combiner“
-- 7 Tips for Improving MapReduce Performance, (Tipp 4)
1. aggregate

45. TextWindowInputFormat

46. Example:
1. WordCount
void translate(key, value) {
WordAbelian invert() {
return new WordAbelian(
for(word : value.split(" ")) { this.word,
write( -1 * this.count);
new WordAbelian(word, 1)); }
}
} WordAbelian aggregate(
WordAbelian other) {
return new WordAbelian(
Writable serialize( this.word,
WordAbelian w) { this.count
Put p = new Put( + other.count);
w.getWord()); }
p.add(…);
return p; boolean neutral() {
} return new WordAbelian(
this.word, 0);
}
boolean isNeutral() {
Translator }
return (this.count == 0);
Serializer WordAbelian

47. Example:
2. Friends Of Friends
FRIENDS
A
D
B FRIENDS OF FRIENDS
C
E

48. Example:
2. Friends Of Friends
translate(person, friends):
aggregate(…):
Merge friends-of-friends-
sets

49. Example:
3. Reverse WebLink-Graph
REVERSE WEB LINK GRAPH
(Row-ID -> Columns)
Google -> {eBay, Wikipedia}
aggregate(…): -> {Google, Wikipedia}
eBay
Merge link-sets Mensa-KL -> {Google}
Facebook -> {Google, Mensa-
KL, Uni-KL}
Wikipedia -> {Google}
Uni-KL -> {Google, Wikipedia}

50. Example:
4. Bigrams
Hi, kannst du mich ___?___ am
Bahnhof abholen? So in etwa
10 ___?___. Viele liebe ___?__.
P.S. Ich habe viel ___?___.

51. Idea:
Analize large amount of
text data

54. Example:
4. Bigrams
extractKey()
a invert():
count*=-1
b NGramAbelian
count
aggregate(… other):
write(…) count+=other.count
neutral():
isNeutral(): count=0
count==0
NGramStep2Abelian

55. Beispielanwendungen:
4. Bigrams
extractKey()
a invert():
count*=-1
b NGramAbelian
count
aggregate(… other):
write(…) count+=other.count
neutral():
isNeutral(): count=0
count==0
NGramStep2Abelian

56. „Which input
data?“

57. bitte
Hi, kannst du mich ___ ___ am
nicht
Bahnhof abholen? So in etwa
<num>Minuten
<num>
Jahre
10 ___ ___. Grüße
dich
Viele liebe ___ __.
zu
Spaß
P.S. Ich habe viel ___ ___.

58. Fundamentals &
The Marimba Framework Evaluation
Related Work

59. WordCount
01:10
01:00
00:50
00:40
Zeit [hh:mm]
00:30 FULL
INCDEC
OVERWRITE
00:20
00:10
00:00
0% 10% 20% 30% 40% 50% 60% 70% 80%
Änderungen

60. Reverse Weblink-Graph
02:51
02:41
02:31
02:21
02:11
02:00
01:50
01:40
Zeit [hh:mm]
01:30
FULL
01:20
INCDEC
01:10
OVERWRITE
01:00
00:50
00:40
00:30
00:20
00:10
00:00
0% 10% 20% 30% 40% 50% 60% 70% 80%
Änderungen

61. Conclusion
Full Recomputation
IncDec / Overwrite

62. Images
Folie 5-9: Folie 37-44:
Flammen und Smilie: Microsoft Office 2010 Puzzle: http://www.flickr.com/photos/dps/136565237/
Folie 10: Folie 46 - 48:
Google: http://www.google.de Junge: Microsoft Office 2010
Folie 11: Folie 49:
Amazon: http://www.amazon.de Google: http://www.google.de
eBay: http://www.ebay.de
Folie 12: Mensa-KL: http://www.mensa-kl.de
Hadoop: http://hadoop.apache.org facebook: http://www.facebook.de
Casio Wristwatch: Wikipedia: http://de.wikipedia.org
http://www.flickr.com/photos/andresrueda/3448240252 TU Kaiserslautern: http://www.uni-kl.de
Folie 16: Folie 50-51:
Hadoop: http://hadoop.apache.org Handy: Microsoft Office 2010
Folie 17: Folie 56:
Hadoop: http://hadoop.apache.org Wikipedia: http://de.wikipedia.org
Notebook: Microsoft Office 2010 Twitter: http://www.twitter.com
Folie 18: Folie 57:
HBase: http://hbase.apache.org Handy: Microsoft Office 2010
Folie 31: Folie 58:
Hadoop: http://hadoop.apache.org Hadoop: http://hadoop.apache.org
Casio Wristwatch: Casio Wristwatch: http://www.flickr.com/photos/andresrueda/3448240252
http://www.flickr.com/photos/andresrueda/3448240252
Folie 32:
Gerüst: http://www.flickr.com/photos/michale/94538528/
Hadoop: http://hadoop.apache.org
Junge: Microsoft Office 2010

63. Bibliography (1/2)
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Masterarbeit, TU Kaiserslautern, August 2012
[1] Apache Hadoop project. http://hadoop.apache.org/.
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http://www.philippeadjiman.com/blog/2010/01/14/hadoop-tutorial-series-issue-4-to-use-or-not-to-use-a-combiner/.
[4] Kai Biermann. Big Data: Twitter wird zum Fieberthermometer der Gesellschaft, April 2012.
http://www.zeit.de/digital/internet/2012-04/twitter-krankheiten-nowcast.
[5] Julie Bort. 8 Crazy Things IBM Scientists Have Learned Studying Twitter, January 2012.
http://www.businessinsider.com/8-crazy-things-ibm-scientists-have-learned-studying-twitter-2012-1.
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http://database.cs.brown.edu/projects/mapreduce-vs-dbms/.
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http://horicky.blogspot.de/2010/08/mapreduce-to-recommend-people.html.
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[13] Steve Krenzel. MapReduce: Finding Friends, 2010. http://stevekrenzel.com/finding-friends-with-mapreduce.
[14] Todd Lipcon. 7 Tips for Improving MapReduce Performance, 2009.http://www.cloudera.com/blog/2009/12/7-tips-for-improving-
mapreduce-performance/.

64. Bibliography (2/2)
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http://play.google.com/store/apps/details?id=com.touchtype.swiftkey.
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