<s>
Apache	O
Nutch	O
is	O
a	O
highly	O
extensible	O
and	O
scalable	O
open	O
source	O
web	B-Application
crawler	I-Application
software	O
project	O
.	O
</s>
<s>
Nutch	O
is	O
coded	O
entirely	O
in	O
the	O
Java	B-Language
programming	I-Language
language	I-Language
,	O
but	O
data	O
is	O
written	O
in	O
language-independent	O
formats	O
.	O
</s>
<s>
The	O
fetcher	B-Protocol
(	O
"	O
robot	O
"	O
or	O
"	O
web	B-Application
crawler	I-Application
"	O
)	O
has	O
been	O
written	O
from	O
scratch	O
specifically	O
for	O
this	O
project	O
.	O
</s>
<s>
Nutch	O
originated	O
with	O
Doug	O
Cutting	O
,	O
creator	O
of	O
both	O
Lucene	B-Language
and	O
Hadoop	B-Application
,	O
and	O
Mike	O
Cafarella	O
.	O
</s>
<s>
To	O
meet	O
the	O
multi-machine	O
processing	O
needs	O
of	O
the	O
crawl	O
and	O
index	O
tasks	O
,	O
the	O
Nutch	O
project	O
has	O
also	O
implemented	O
a	O
MapReduce	B-Operating_System
facility	O
and	O
a	O
distributed	B-Protocol
file	I-Protocol
system	I-Protocol
.	O
</s>
<s>
The	O
two	O
facilities	O
have	O
been	O
spun	O
out	O
into	O
their	O
own	O
subproject	O
,	O
called	O
Hadoop	B-Application
.	O
</s>
<s>
In	O
January	O
,	O
2005	O
,	O
Nutch	O
joined	O
the	O
Apache	B-Application
Incubator	I-Application
,	O
from	O
which	O
it	O
graduated	O
to	O
become	O
a	O
subproject	O
of	O
Lucene	B-Language
in	O
June	O
of	O
that	O
same	O
year	O
.	O
</s>
<s>
Branch	O
Release	O
date	O
Description	O
1.1	O
2010-06-06	O
This	O
release	O
includes	O
several	O
major	O
upgrades	O
of	O
existing	O
libraries	O
(	O
Hadoop	B-Application
,	O
Solr	O
,	O
Tika	O
,	O
etc	O
.	O
)	O
</s>
<s>
1.4	O
2011-11-26	O
This	O
release	O
includes	O
several	O
improvements	O
including	O
allowing	O
Parsers	O
to	O
declare	O
support	O
for	O
multiple	O
MIME	O
types	O
,	O
configurable	O
Fetcher	B-Protocol
Queue	O
depth	O
,	O
Fetcher	B-Protocol
speed	O
improvements	O
,	O
tighter	O
Tika	O
integration	O
,	O
and	O
support	O
for	O
HTTP	O
auth	O
in	O
Solr	O
indexing	O
.	O
</s>
<s>
1.5	O
2012-06-07	O
This	O
release	O
includes	O
several	O
improvements	O
including	O
upgrades	O
of	O
several	O
major	O
components	O
including	O
Tika	O
1.1	O
and	O
Hadoop	B-Application
1.0.0	O
,	O
improvements	O
to	O
LinkRank	O
and	O
WebGraph	O
elements	O
as	O
well	O
as	O
a	O
number	O
of	O
new	O
plugins	O
covering	O
blacklisting	O
,	O
filtering	O
and	O
parsing	O
to	O
name	O
a	O
few	O
.	O
</s>
<s>
This	O
release	O
features	O
inclusion	O
of	O
Crawler-Commons	O
which	O
Nutch	O
now	O
utilizes	O
for	O
improved	O
robots.txt	O
parsing	O
,	O
library	O
upgrades	O
to	O
Apache	B-Application
Hadoop	I-Application
1.1.1	O
,	O
Apache	O
Gora	O
0.3	O
,	O
Apache	O
Tika	O
1.2	O
and	O
Automaton	O
1.11-8	O
.	O
</s>
<s>
Key	O
library	O
upgrades	O
have	O
been	O
made	O
to	O
Apache	B-Application
Hadoop	I-Application
1.2.0	O
and	O
Apache	O
Tika	O
1.3	O
.	O
</s>
<s>
2.2.1	O
2013-07-02	O
This	O
release	O
includes	O
library	O
upgrades	O
to	O
Apache	B-Application
Hadoop	I-Application
1.2.0	O
and	O
Apache	O
Tika	O
1.3	O
,	O
it	O
is	O
predominantly	O
a	O
bug	O
fix	O
for	O
NUTCH-1591	O
-	O
Incorrect	O
conversion	O
of	O
ByteBuffer	O
to	O
String	O
.	O
</s>
<s>
IBM	O
Research	O
studied	O
the	O
performance	O
of	O
Nutch/Lucene	O
as	O
part	O
of	O
its	O
Commercial	O
Scale	O
Out	O
(	O
CSO	O
)	O
project	O
.	O
</s>
<s>
Their	O
findings	O
were	O
that	O
a	O
scale-out	O
system	O
,	O
such	O
as	O
Nutch/Lucene	O
,	O
could	O
achieve	O
a	O
performance	O
level	O
on	O
a	O
cluster	O
of	O
blades	O
that	O
was	O
not	O
achievable	O
on	O
any	O
scale-up	O
computer	O
such	O
as	O
the	O
POWER5	B-Device
.	O
</s>
<s>
TREC	B-Language
)	O
was	O
gathered	O
using	O
Nutch	O
,	O
with	O
an	O
average	O
speed	O
of	O
755.31	O
documents	O
per	O
second	O
.	O
</s>
<s>
Hadoop	B-Application
–	O
Java	B-Language
framework	O
that	O
supports	O
distributed	O
applications	O
running	O
on	O
large	O
clusters	O
.	O
</s>
<s>
Krugle	B-Application
uses	O
Nutch	O
to	O
crawl	O
web	O
pages	O
for	O
code	O
,	O
archives	O
and	O
technically	O
interesting	O
content	O
.	O
</s>
