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persimmon
load balancer
Solution Engineering
FUKUTOMI Yutaka
if no balancer
with balancer
LB
thread
LB
listener
server thread
server thread
server thread
server thread
loop{
read from client;
write to server;
read from server;
write to client;
}
selector
LB
selector
client server
selector
loop{
select;
if(accept)
connect to server;
if(on read)
write to other;
}
session
session data
fool balancer
LB
session data
NO session data !!
session error !!
wise balancer
LB session data
client server
A X
A
X
Y
session with wise balancer
LB
session data
for A
session data
for B
A
B
X
Y
client server
A X
B Y
reliability
LB
when LB down
LB
active/standby
LB
LB
active
standby
normal
LB
LB
active
standby
a
b
(x)
connect to “x”
Hey! I’m alive!!
“active” is live.
I stay as “standby”
when active LB is down
LB
LB
active
standby
a
b
(x)
connect to “x”
no “active”
is alive?
failover
LB
LB
active
a
b
(x)
connect to “x”
I become
“active”.
Hey! I’m alive!!
終劇 (fin)

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Jun.27 fukutomi