<s>
Apache	B-Application
Samza	I-Application
is	O
an	O
open-source	B-Application
,	O
near-realtime	O
,	O
asynchronous	O
computational	O
framework	O
for	O
stream	B-Application
processing	I-Application
developed	O
by	O
the	O
Apache	O
Software	O
Foundation	O
in	O
Scala	B-Application
and	O
Java	B-Language
.	O
</s>
<s>
It	O
has	O
been	O
developed	O
in	O
conjunction	O
with	O
Apache	B-Language
Kafka	I-Language
.	O
</s>
<s>
Both	O
were	O
originally	O
developed	O
by	O
LinkedIn	B-Application
.	O
</s>
<s>
Samza	B-Application
allows	O
users	O
to	O
build	O
stateful	B-Application
applications	O
that	O
process	O
data	O
in	O
real-time	O
from	O
multiple	O
sources	O
including	O
Apache	B-Language
Kafka	I-Language
.	O
</s>
<s>
Samza	B-Application
provides	O
fault	O
tolerance	O
,	O
isolation	O
and	O
stateful	B-Application
processing	O
.	O
</s>
<s>
Unlike	O
batch	O
systems	O
such	O
as	O
Apache	B-Application
Hadoop	I-Application
or	O
Apache	B-Language
Spark	I-Language
,	O
it	O
provides	O
continuous	O
computation	O
and	O
output	O
,	O
which	O
result	O
in	O
sub-second	O
response	O
times	O
.	O
</s>
<s>
There	O
are	O
many	O
players	O
in	O
the	O
field	O
of	O
real-time	O
stream	B-Application
processing	I-Application
and	O
Samza	B-Application
is	O
one	O
of	O
the	O
mature	O
products	O
.	O
</s>
<s>
Samza	B-Application
is	O
used	O
by	O
multiple	O
companies	O
.	O
</s>
<s>
The	O
biggest	O
installation	O
is	O
in	O
LinkedIn	B-Application
.	O
</s>
