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From YouTube: CDS Jewel -- Passive Monitors
A
B
B
B
So
that
would
that
was
my
initial
idea.
Sage
mentioned
very
well
that
this
could
be
used
as
a
backup,
monitor
and
all
that
sorts
of
stuff,
although
yeah
what's
my
pad,
although
this
has
a
bunch
of
small
issues
that
need
to
be
ironed
out,
one
of
which
would
be
how
to
actually
get
a
passive
monitor
into
the
active
set
of
monitors
and
when
to
actually
decide
what
to
do
with.
B
Can
we
just
bring
up
the
passive
monitor
and
have
that
passive
monitor
forming
a
quorum
in
the
second
room?
Would
this
cause
potentially
a
split
brain
situation?
So
this
is
the
kind
of
issues
that
need
to
be
our
end
out,
because
the
rest
of
the
rest
of
the
other
issues
are
basically
tiny
things
such
as
will
this
monitor
participate
in
an
election?
B
B
B
C
B
C
C
D
E
E
Consider
I
want
to
do
like
a
backup
for
like
with.
E
B
D
You
have
a
sequence
of
hot
standbys
for
a
particular
rank.
I
mean
that
we
don't
have
one
yet,
but
we
would,
after
does.
Let's
say
that
the
rank
and
monitor
has
stand
by
zero
through
L.
You
could
scan
by
K
would
be
could
safely
take
over
as
long
as
it
has
an
assurance
from
everything
greater
than
K
that
they
aren't
currently
active.
Does
that
make
sense
the
active
would
be
allowed
to
run
as
long
as
the
passives
affirmative
Lee
tell
it
that
they're
not
running
that
would
allow
you
to
do
it.
D
B
So
in
that
case,
you
would
probably
hit
the
split
brain
issue
with
having
two
columns
that
are
not
aware
of
each
other,
and
this
is
why
I
would
love
to
at
first
to
just
delegate
this
to
the
admin
and
let
the
admins
cited
yeah.
This
is
not
a
problem,
we'll
just
bring
this
one
passive,
monitor
up
or
back
to
the
forum,
and
this
would
be
a
very
dump
approach,
but
as
a
first
approach,
it
would
be
a
suitable
problems.
D
C
D
B
D
B
The
thing
say
that
you
still
you
have
just
two
monitors
in
the
New
York
cluster
one
dies
but
eventually
comes
back
for
some
reason:
yeah
it
will.
Okay
by
the
example,
you
have
three
monitors
in
the
quorum,
one
dies,
the
the
second
one
that
you
have
still
have
a
quorum,
but
the
second
one
dies
as
well.
The
one
that
died
previously
comes
back
to
quorum
comes
back
alive.
A
D
B
E
D
D
B
B
The
other
two
would
not
have
a
core.
Oh
no
day,
here's
the
thing
and
last
the
other
two
knew
about
the
passive
monitor,
bring
being
brought
back
to
being
brought
into
the
into
the
active
set
whatever
they
would
still
be
able
to
form
a
quorum
or
not
big.
Let
me
refresh
is
this:
if
you
have
one
passive
monitor
being
brought
up
in
in
both
rooms,
both
rooms
would
assume
they
had
a
quorum.
D
B
D
You
would
have,
you
would
have
822
matter
requires
and
two
additional
machines.
You
are
hoping
to
add
to
the
quorum.
I
thought
this
is
usually
how
paxos
closer
expansions
work.
They
usually
require
an
existing
either
that
or
an
administrator
needs
to
say.
I
know
for
sure
that
you're,
the
only
alive,
1
and
I
want
you
to
use
your
state
that
kind
of
thing,
but
if
it
normally,
if
you
want
to
do
it
in
the
strictly
correct
way,
you
need
a
quorum
of
the
original
monitors
to
persist.
The
fact
that
you're
expanding
the
forum.
B
Yeah,
but
we
don't
really
do
that,
I
think,
for
instance
the
example
in
point
synchronization.
If
you
only
have
one,
if
you
had
three
monitors
and
two
died,
you
can
just
bring
one
monitor
up
and
it
will
synchronize
from
a
non-existent
quorum,
which
is
just
one
single
monitor,
because
the
other
two
have
died.
Horrible
deaths.
D
I'm
getting
at
is
that
it's
it's
equivalent
to
if
you
had
a
three
minor
quorum
to
in
one
room.
One
on
the
other
and
a
split
brain
happened
between
those
two
rooms
and
one
of
the
OS
DS
and
the
other
room
died.
Then
you
could
just
as
easily
bring
up
a
new
monitor
in
each
room
and
both
rooms
would
think
they
had
2
22
monitors
right.
That's
not
different
from
it.
Bringing
up
a
passive
monitoring,
utrom.
B
D
I
mean
so
there's
there's
the
operational
and
efficiency
difference
about
if
you're,
bringing
up
new
vm
with
a
new
monitor,
you
have
to
fill
it
store.
First,
the
synchronization
part,
but
I
think
the
part
where
you
empower
it
to
be
a
deciding
part
of
the
monitor
quorum,
isn't
different.
I
think
that
part's
the
same.
C
C
B
B
D
B
D
B
B
B
D
B
B
B
B
B
That
one
I
think
is
pretty
easy
to
accomplish
other
than
that
I
I
think
this
will
be
mostly
a
matter
of
how
consistent
we,
how
actually,
how
up
to
date
with
a
closer
state.
We
want
the
passive
monitors
to
be
because
on
one
hand
we
want
them
to
be
up
to
date,
but,
on
the
other
hand,
don't
want
to
hammer
the
existing
monitors
and
disguise
likely
the
leader
and
at
in
the
third,
in
a
first
approach,
with
the
responsibility
of
keep
on
having
these
monitors
up
to
date
at
all
times,
because
faxes
proposals.
B
If
we
have
frequent
praxis
proposals,
we
may
not
well
send
keep
on
sending
keeping
on
sending
messages
to
the
passive
monitors.
May
just
be
hammering
the
leader
a
bit,
because,
instead
of
updating,
three
or
four
monitors
or
whatever
we
would
be
updating
an
additional
monitor
or
two
or
three
monitors
or
whatever
monitors
when
possible
solution
would
be
to
actually
tie
a
passive
monitor
to
a
random
monitor
for
two
for
the
purpose
of
receiving
the
updates,
so
that,
instead
of
being
the
leader
there
is
the
one
responsible
for
sending
these
updates.
E
E
This
we
would
keep
your
documentation
a
little
bit
and
they
have
a
concept
of
observers
which
can
participate
in
gorham,
but
rather
than
being
used
for
KJ
forces
or
optimizing
adding
new
members
to
the
quorum
they
used
mainly
for
by
creed.
Scalability
seems
like
they're
kind
of
two
different
use
cases.
Yeah.
B
Yeah,
that's
one
of
the
things
I
mentioned
earlier.
I
think
whether
these
passive
monitors
would
serve
client
requests
reads,
for
instance,
but
if
that's
right,
if
they
are
to
serve
reads,
we
need
to
make
sure
they
are
up
to
date
as
up
to
date
as
a
remaining
cluster,
because
we
don't
want
to
serve
old
maps
to
clients.
B
B
B
Yeah:
okay,
when
regard
to
reads,
is
the
huge
thing.
Unless
the
client
is
aware
that
those
monitors
are
only
for
reads,
we
would
still
have
to
forward
all
the
messages
to
to
the
leader
all
the
right
requests
and
that
would
be
basically
acting
as
a
peon,
but
a
slightly
out-of-date
beyond
which
we
would
not
be
able
to
have,
because
we
don't
have.
We
don't
want
to
serve
old
reads
all
versions,
so
it's
basically
the
same
as
hiring
peons
and.
B
B
B
C
C
C
C
Example,
I
have
two
two
rooms,
two
monitors
on
each
side
and
have
a
sewing
room
that
we
saw
a
cyclist
all
these
or
something
like
that,
but
it's
only
a
modifier
on
that
to
run
in
the
case
where
we
have
a
split
friend
situation
between
them
across
the
network
connection
between
volume.
Modern
too,
is
that
so
we
have
a
search
device
running
and
deciding
which
side
is
winning,
but
they
have
the
same
problem.
All
your
mistakes,
I
did.
All
this
text
is
deciding
I
rod
still
running
and
room
1
and
surface
exciting.