<s>
The	O
Scalable	O
Weakly	O
Consistent	O
Infection-style	O
Process	O
Group	O
Membership	O
(	O
SWIM	O
)	O
Protocol	O
is	O
a	O
group	O
membership	O
protocol	O
based	O
on	O
"	O
outsourced	O
heartbeats	B-Operating_System
"	O
used	O
in	O
distributed	B-Architecture
systems	I-Architecture
,	O
first	O
introduced	O
by	O
Indranil	O
Gupta	O
in	O
2001	O
.	O
</s>
<s>
It	O
is	O
a	O
hybrid	O
algorithm	O
which	O
combines	O
failure	B-Operating_System
detection	I-Operating_System
with	O
group	O
membership	O
dissemination	O
.	O
</s>
<s>
The	O
protocol	O
has	O
two	O
components	O
,	O
the	O
Failure	B-Operating_System
Detector	I-Operating_System
Component	O
and	O
the	O
Dissemination	O
Component	O
.	O
</s>
<s>
The	O
Failure	B-Operating_System
Detector	I-Operating_System
Component	O
functions	O
as	O
follows	O
:	O
</s>
<s>
the	O
crash-failure	O
of	O
any	O
node	O
in	O
the	O
group	O
is	O
eventually	O
detected	O
by	O
all	O
live	O
nodes	O
)	O
.	O
</s>
<s>
This	O
is	O
equivalent	O
to	O
gossip	B-Operating_System
dissemination	I-Operating_System
.	O
</s>
<s>
Round-Robin	B-Algorithm
Probe	O
Target	O
Selection'''	O
:	O
Instead	O
of	O
randomly	O
picking	O
a	O
node	O
to	O
probe	O
during	O
each	O
protocol	O
time	O
step	O
,	O
the	O
protocol	O
is	O
modified	O
so	O
that	O
each	O
node	O
performs	O
a	O
round-robin	B-Algorithm
selection	O
of	O
probe	O
target	O
.	O
</s>
