<s>
Apache	B-Language
Giraph	I-Language
is	O
an	O
Apache	O
project	O
to	O
perform	O
graph	B-Application
processing	I-Application
on	O
big	B-Application
data	I-Application
.	O
</s>
<s>
Giraph	O
utilizes	O
Apache	B-Application
Hadoop	I-Application
's	O
MapReduce	O
implementation	O
to	O
process	O
graphs	O
.	O
</s>
<s>
Facebook	B-Application
used	O
Giraph	O
with	O
some	O
performance	O
improvements	O
to	O
analyze	O
one	O
trillion	O
edges	O
using	O
200	O
machines	O
in	O
4	O
minutes	O
.	O
</s>
<s>
Giraph	O
is	O
based	O
on	O
a	O
paper	O
published	O
by	O
Google	O
about	O
its	O
own	O
graph	B-Application
processing	I-Application
system	O
called	O
Pregel	O
.	O
</s>
<s>
It	O
can	O
be	O
compared	O
to	O
other	O
Big	O
Graph	B-Application
processing	I-Application
libraries	O
such	O
as	O
Cassovary	O
.	O
</s>
