<s>
StormCrawler	B-Language
is	O
an	O
open-source	B-Application
collection	O
of	O
resources	O
for	O
building	O
low-latency	O
,	O
scalable	O
web	B-Application
crawlers	I-Application
onApache	O
Storm	O
.	O
</s>
<s>
It	O
is	O
provided	O
under	O
Apache	B-Application
License	I-Application
and	O
is	O
written	O
mostly	O
in	O
Java	B-Language
(	O
programming	O
language	O
)	O
.	O
</s>
<s>
StormCrawler	B-Language
is	O
modular	O
and	O
consists	O
of	O
a	O
core	O
module	O
,	O
which	O
provides	O
the	O
basic	O
building	O
blocks	O
of	O
a	O
web	B-Application
crawler	I-Application
such	O
as	O
fetching	O
,	O
parsing	O
,	O
URL	O
filtering	O
.	O
</s>
<s>
Apart	O
from	O
the	O
core	O
components	O
,	O
the	O
project	O
also	O
provides	O
external	O
resources	O
,	O
like	O
for	O
instance	O
spout	O
and	O
bolts	O
for	O
Elasticsearch	B-Application
and	O
Apache	B-Language
Solr	I-Language
or	O
a	O
ParserBolt	O
which	O
uses	O
Apache	B-Language
Tika	I-Language
to	O
parse	O
various	O
document	O
formats	O
.	O
</s>
<s>
Linux	B-Application
published	O
a	O
Q&A	O
in	O
October	O
2016	O
with	O
the	O
author	O
of	O
StormCrawler	B-Language
.	O
</s>
<s>
A	O
comparative	O
benchmark	O
with	O
Apache	B-Language
Nutch	I-Language
was	O
published	O
in	O
January	O
2017	O
on	O
dzone.com	O
.	O
</s>
<s>
Several	O
research	O
papers	O
mentioned	O
the	O
use	O
of	O
StormCrawler	B-Language
,	O
in	O
particular	O
:	O
</s>
<s>
StormCrawler	B-Language
is	O
used	O
notably	O
by	O
Common	O
Crawl	O
for	O
generating	O
a	O
large	O
and	O
publicly	O
available	O
dataset	O
of	O
news	O
.	O
</s>
