►
From YouTube: Samual Just -- Recovery erasure coding cache tiering
Description
A
A
C
A
A
A
Tries
to
make
it
easy
to
reason
about
accessing,
distributed,
storage
pockets
are
divided
into
flat,
namespaces
all
pools.
Each
pool
can
have
separate
placement
rules
that
allow
you
to
place
data
on
gas,
SSDs
or
slaughter
apart
rise,
depending
on
data
all
within
the
same
cluster
Randall's
also
offers
strong
consistency,
which
makes
it
a
lot
easier
to
reason
about
writing
assistant
like
our
guinea,
since
you
don't
have
to
worry
about
the
possibility
of
an
object
going
back
in
time,
simply
because
someone
happens
reboot
server.
Let
me
really
annoying
kratos.
A
Available
for
all
of
the
languages
I
mentioned
before,
the
interface
is
quite
rich,
which
poses
some
challenges
for
cash
generation.
Footage
will
get
into
limp.
For
one
thing:
we
support
partial
over
rights
of
objects
rather
than
requiring
usual
right,
I
erotic.
This
is
nice
for
our
beauty,
as
you
can.
A
Rights,
audio
fire
block
device
into
rights
on
the
individual
format,
my
chunks
fairly
directly
same
with
south
of
us.
It
would
be
much
more
difficult
if
RB
needed
to
do
or
read,
modify
the
four
megabyte
blog
Montgomery
on
the
right
back
out.
Each
object
can
also
have
a
set
of
user-defined
metadata
in
small
packs
actors,
pretty
much
exactly
like
you
would
imagine
or
standard
file
system,
but.
A
E
A
In
fact,
that
move
out
it's
just
up
and
similarly
every
button
index
as
a
data
payload
is
just
as
heavy
day
South
leaving
plenty
of
you
have
questions
for
me,
so
I'll
be
great
nervous.
I
think
everyone
here
is
familiar
with
South
buster,
but
there
are
two.
Basically
we've
got
the
OSC
which
actually
stores
data,
and
then
we
have
the
modern,
a
sauce
monitor
Buster,
which
is
essentially
where
the
cluster
gets
its
ground.
A
A
A
A
C
D
A
Data
and
the
way
it
does,
that
is
by
using
an
algorithm
fault
rush
rush,
takes
a
thing
to
be
placed
and
a
fuss
around
and
outputs
the
location
of
the
fov
do
so,
but
instead
of
actually
running
the
object
name
itself
from
crush,
we
instead
hash
the
object,
game
map
and
complacent
group
and
then
run
the
placement
for
Russia.
If
you.
D
E
A
A
A
Well?
That's.
Actually
a
cluster
mad
change.
The
OS
seus
will
report
the
failure
to
the
monitors
the
bouncy
novelist,
ESN
reported.
The
failure
providers
will
publish
a
new
cluster
map
marking
Mozilla's
heat
down.
This
is
exactly
what
you
see
in
when
you
run
set,
though,
is
d
dump
can
see
it
OSD
mark
this
down,
because
the
haustenberg
is
marked
down
crush,
will
skip
that
OSD
and
move
on
to
the
next
one
in
the
list,
which
in
this
case
is
this,
the
old
primary
will
then
arrange
for
the
data
to
be
replicated
to
the
new
relative.
A
D
C
C
A
Overseas,
where
the
width
group,
the
new
primary
work,
that
out
on
its
own
based
on
the
group
buffer
down
so
a
nice
cooperative
crush,
is
that
groups
are
d
bluster
that
is
into
placement
groups,
share
a
primary,
typically
replicas
Walter,
where
I'm
sorry,
if
to
yeah.
If
20,
if
to
place,
we
could
share
an
osc,
typically,
the
other,
the
other
relatives.
Those
new
place
recruits
will
be
on
different
illnesses.
This
seems
that
if
a
placement
always
seen
with
about
100,
plays
and
groups
diets,
we
won't
have
one.
A
A
The
answer
is
an
algorithm
called
hearing.
You
have
probably
seen
this
in
your
own
Buster's.
If
you
cause
it
changes
the
buzzer
a
bunch
of
place,
but
groups
will
go
into
a
period
stage
and
then
eventually
go
after,
and
this
is
what
they're
doing.
In
the
meantime,
each
OS
cevap
generated
by
the
monitors
is
assigned
an
increasing
other
number.
The
consistency
of
these
numbers
is
guaranteed
by
the
tassels
on
where
the
running
on
battery.
A
A
This
means
that
every
every
OSD
is
always
able
to
walk
backwards
through
time
and
figure
out.
Every
OSD
that
has
been
responsible
for
particular,
listen
back
last
time
that
that
placement
room
was
fully
recovered,
and
that
is
essentially
the
core
of
help.
Hearing
figures
out,
where
is
I
rights
and
may
not
know,
comes
so
to
be
really
kinky
redevelopments.
Let's
suppose
that
our
epic
2220
OST
11
map
is
the
primary
for
Fiji
1.4,
with
OS
ds5
and
30th
revenues
on
its
own.
A
It
must
verify
that
the
object
and
serving
everyone
is
coming
so
to
do
that
the
primary
walked
backwards
through
it
stored
now
and
begins
reconstructing
previous
sets
of
mosca
see
it
finds
that
the
bag,
except
last
change
in
epic
2113
before
now
in
1984.
Before
that,
we
were
able
to
stop
at
epic
1984,
because
0
is
the
11
has
written
down
that
it
went
active
in
fed
up
these
so-called
last
seven
start
a
member
of
the
PG
infrastructure.
A
A
So,
in
order
to
go
after
their
40
is
he
allowed?
It
simply
needs
to
make
sure
that
it
cures
from
either
OSD
540
is
in
30
since
any
right
completed
in
the
epic.
The
interval
workers
now
must
be
remembered
by
both
of
them,
since
any
right
must
be
completed
by
all
replicas.
Before
being
active
active
life,
we
represent
the
state
of
the
placement
of
molecular
low
esteem
by
keeping
a
list
of
the
most
recent
operations
on
the
facebook
group,
witness
one
that
was
neat
called
a
pgy.
No
teacher
long
does
not
contain
the
actual
data.
A
It
is
not
Madea.
It's
just
a
list
of
modifications
that
have
happened
through
objects
for
each
replica
get
the
relatives.
Log
overlaps
with
the
authoritative
water,
that
is
the
log
entries,
are
numbered,
so
the
logs
overlap.
We
can
construct
the
complete
list
of
every
object
that
that
replica
is
how
to
data
by
simply
walking
forward
with
us.
A
So
if
we
don't
know
which
objects
are
valid
on
the
primary,
we
certainly
can
serve
wings.
So
if
I
from
hearing
the
primary
determines
that
it
or
any
other
peer
requires,
actually
it
will
request
the
letter
per
cluster
publisher,
a
new
back
with
healthy,
closed
cities
instead
as
the
acting
Center
once
that
map
is
published
here,
it
will
happen
again
and
the
update
viewers
independently
conclude
that
they
should
serve
reads
and
writes,
welcome
currently
backfilling
directors.
A
A
1130,
a
placement
group
is
mapped
to
0
1
&
2.
Then
the
user
does
something
crazy
to
the
crush
map.
Maybe
they
remove
the
host
or
completely
change
the
crushed.
Crackers.
I
say
that,
because
this
sort
of
thing
wouldn't
normally
happen,
normally
one
no
se
might
might
might
might
change.
But
if
you
were
creative,
you
could
get
crushed
into
this
and
it
reacts.
The
placement
photo.
Is
these
three
four
and
five
and
seven
so
0
is
III,
will
then
go
through
hearing.
It
will
find
that
it
has
to
complete
the
FPPs.
A
A
Of
others,
it
simply
does
have
a
problem,
so
it
will
find
that
you're
not
actually
serve
any
data,
since
it
has
no
options,
so
it
sends
a
message
to
the
monitor
requesting
a
temporary
EG
matter.
In
fact,
if
you
do
a
set
PG
ducky,
you
will
seal
this
on
all
of
the
current
some
PG
Navitus,
any
modern
of
the
listen,
oh
and
it
of
course
shows
up
in
every
OST
up.
So
if
you
don't
always
see
now,
once
you
have
fooled
crystal
you'll
see
the
list.
A
So
it's
sense.
This
message
the
monitor
with
the
temporary
requesting
a
temporary,
badly
2012
since
those
30
s
these
are
still
perfectly
capable
of
serving
so.
Finally,
the
monitors
produce
a
nap
with
that
mapping
in
epic
1000
30
40
50
OSD
0
volt.
Here
it
will
find
that
it
is
a
temporary
EG
napping,
but
that
was
free
really
get
servings.
So
mapping
is
great.
It
will
get
serving
reads
and
writes
with
0.
1
2
is
the
acting
set,
while
in
the
background
backfilling
OS
these
three
four
five.
C
E
A
Backfill
finally
completes
Oh
is
zero,
will
request
a
temporary,
not
experience
the
monitors
finally
get
around
to
doing
that
in
epic
1090
10
s,
III
will
peer
find
that
it's
completely
up
to
date
and
then
those
these
three
for
fiber
hood
Oh
s
III.
Will
they
notify
TV
5012?
They
can
delete
their
local
copies
of
the
PG
saludos
concrete.
A
So
key
to
the
back
whole
process
is
that
we
backfill
in
a
well-defined
optical,
that
is
all
objects
and
sat,
are
ordered
by
the
a
chopper
world.
If
you're
familiar
with
the
code
will
see
that
comedy
/
each
other
ehh,
it's
the
internal
structure.
We
use
investigating
object.
Oh
so
we
all
be
back
building
a
junket
work
and
as
we
go
for
it
us
as
we
do
backfill
the
info
done
last
backfilled
field
will
advance
as
we
get
further
and
further
to
the
PGA.
A
A
Features
how
they
fit
into
the
overall
set
aside.
It's
actually.
There
are
two
ways
to
think
about
how
you
could
comparing
system
like
self.
You
can
either
embed
hearing
decisions
in
a
layer
under
the
OST,
for
example,
using
flash
cash
or
becouse
regime
pass,
or
any
of
those
up
and
I
think
some
people
in
the
community
right
out
about
your
bubble.
A
But
the
challenge
is
that
you
have
to
guess
at
when
you're
doing
your
deployment
exactly
how
much
flash
or
past
orders
to
put
in
each
other
and
that
many
challenges,
because
you
don't
necessarily
know
the
size
of
your
working
zengo,
how
much
data
you're
ultimately
going
to
want
to
store.
So
if,
instead,
we
do
our
cashing
in
theory
with
different
hardware
for
the
cash
invaders,
we
will
be
able
to
scale
both
you're
independently,
based
on
working
set
size
and
put
business.
A
So
our
new
cash
during
teachers
press
the
latter's
promotion
I
mentioned
before
that
pools,
can
have
different
placement
for
the
side.
This
is
important
because
the
cash
and
the
haste
here
is
our
themselves
fully
fledged
strategies
with
their
own
crush
placement
rules
and
their
own
occupation
rules
and
all
about
something.
A
A
It's
also
important
that
the
design
allows
clients
to
understand
who
the
cashier
topology
from
the
LSD
behind.
So
the
cash
secured
relationships
are
written
to
me.
Ost
mail,
along
with
the
tools,
so
the
clients
are
able
to
intelligently
write,
requests
to
capture
base
to
your
based
on
catching
policy.
That
means
that
applications
written
on
top
of
laredos
don't
care
or
need
Noah.
So.
A
So
in
write
that
code,
the
librettos
playing
operating
on
the
backing
pool
will
weed
out
of
the
ose
not
vetted
back.
There
is
a
cash
flow,
south
petrol,
transparently,
redirect
reads
and
writes
of
the
casualties.
The
hospital
is
able
to
fully
satisfied
rights.
Citizens
setup
is
right
on
this
library,
for
the
casual
instance
of
the
object
will
delay.
The
right
well
promotes
the
outfit
for
that,
but
now,
in
recently,
as
a
good
for
novice,
it's
sort
of
unfortunate
that,
in
order
to
complete
a
4
kilobyte
right,
my
poor
megabyte
parking.
A
A
This
is
safe
because
the
cashier
of
gnomes
got
the
other
piece
of
present,
and
so
it's
safe
to
do
the
right
credit
to
base
note,
and
we
can
still
promote
the
object
in
the
background
after
the
proxy
brain
is
completely
so.
Similarly,
with
a
read
on
a
cash,
it
will
form
the
read
directly
from
the
cash
flows
which
again
is
safe
because
the
cash
pool
sees
every
monday
and
there's
no
possibility
based
here
at
a
super
cop.
A
And
slowly
in
the
event
of
a
cache
miss
the
wreath
can
be
redirected
to
the
back
between
or
in
order
to
a
parade
around
trip.
The
primary
also
have
the
olive
proxy
that
possibly
also
trigger
cannot
the
promotion
based
on
the
hotness
of
the
outfit
and
a
likelihood
that
will
be
access
to
get
where
so.
We're
able
to
make
the
castro
in
features
fit
nicely
with
being
within
the
existing
set
architecture
because
of
all
the
intelligence
offended
at
the
greatest
Glanville.
A
The
promotion
and
addiction
operations
by
themselves.
Actually
Rios
operations,
the
cash
to
your
primary
actually
acts
as
a
ratos
flames
could
be
based
here
and
so
detached
your
primary
doesn't
care
whether
there
are
failures
for
replication
happening
based
here.
It
does
the
same
thing
on
the
greatest
mind,
but
if
those
the
amount
updates
at
RP
sense
requests,
SS.
A
So
it's
in
line
with
the
with
the
request,
but
the
nice
thing
about
the
wave
structure
is
that
there's
no
need
for
an
external
agent,
since
I've
enacted
following
also
be
primary
or
primary
for
the
attached.
Secure
version
of
the
object
is
a
sort
of
name.
It
doesn't
mean
anyone
elses
provision
to
work
out
whether
it
can
promote
or
even
photography.
So
every
every
OSD
for
the
placement
groups,
for
which
is
the
primary,
makes
all
of
these
decisions.
F
A
Yeah,
so
currently
it's
a
bit
limited.
It's
either
presence
in
the
cashier
horizontal,
if
its
present
in
the
cache
dearer
that
it's
necessarily
afford
hidden
cost
me
the
newest
copy.
So
it's
a
rehashed
your
authority,
the
data
on
and
if
it's
are
right
for
their
other
decisions
to
be
made,
dat
OST
is
able
to
locally
make
that
out
of
that.
This.
A
A
To
investigated
distribution
for
one
thing,
if
you
have
for
terror
by
sdsu,
certainly
can't
have
an
object,
that's
bigger
than
for
starbucks
right.
What
would
you
have
small
objects?
For
example,
cubbies
are
always
broken
to
poor,
magnify
objects
or
today
or
it's
skipping,
but
their
exercise.
Then
those
objects
with
the
rel
distributed.
Can
they
do
the
pool?
So
while
it's
true
that
you
can't
have
a
partial
hit
or
a
partial
nasaan
single
object,
you
can't
have
a
partial
bit
what
a
partial
test
on
a
whole
RDV,
because.
A
C
A
F
A
A
Turn
all
these
into
rights.
So
what
would
our
current
approach
involves?
Maintaining
it
in
Henryville
filter
for
a
configurable
amount
of
time
Edward.
So
it
reaches
a
configurable,
false
positive
probability
and
then,
once
the
bloom
filter
fills
up
to
that
point,
we
waited
up
to
disk
and
we
maintaining
the
most
recent
n
filters
on
disk
where
10
is
determined
by.
A
A
Estimate
recency.
We
can
certainly
check
that
the
first
will
filter
that
shows
up
to
get
my
idea
of
how
easily
it
was
accessed,
and
this
importance
our
this
behavior,
whether
we
promote
four
prong
setting
up
the
policies,
are
fairly
simplistic
at
this
stage.
I
think
you're
good.
You
can
set
how
you
can
set
it
to
simply
promote
if
it's
been
accessed
a
certain
number
of
times
in
the
last
hour,
thanks
a
certain
number
of
times
in
the
store
that
does
things
I
got,
but.
A
Anyway,
so,
in
the
background
attention
that
the
writer
in
cash
gorilla
see,
if
really
in
the
driver's
seat
as
authoritative
information
about
what's
going
on
in
for
all
of
its
own
for
all
that
sort
of
it.
So
in
the
background,
every
OST
is
always
standing
all
of
the
cashier
pgs
that
primary
form
and
evaluating
temperature
and
then
making
decisions
about
whether
to
flush
and
whether
to
indict
those
those
onions.
A
A
And
same
with
addiction,
as
the
PG
fills
up
you'll
be
willing
to
olimpiada
without
rockets
until
it's
the
link
God
to
make
sure
that
the
object
that
fool
doesn't
so
as
long
as
there's
still
space
left
in
the
pool.
We
make
an
effort
to
keep
the
hot
as
objects
around,
but
as
it
goes
up,
we
start
to
get
less
plus
P.
C
C
A
C
A
Pretty
badly,
if
you
lose
all
the
replicas
for
placement,
that's
kind
of
design
consultative.
That
way,
that
would
be
an
interesting
direction
to
explore,
but
the
challenge
isn't
imaginary.
That's
that's
pretty
easy.
The
challenge
is
creating
a
making
it
set
for
of
powered
of
it
or
where
data
loss
is
okay.
So
we
need
to
create
a
septal
where
the
policy
was
that
if
there
were
no
light
replicas
of
the
place
or
if
it
just
creates
the
messenger
them
move
itself.
That.
C
A
A
A
Not
least
because
it
won't,
let
you
create
cash
generation
of
that
promote
flush
are
pretty
expensive,
so
you
need
an
object.
Temperature.
That's
really
highly
skewed,
that
is
most
io
goes
for
a
very
small
difference.
Asian
fit
women
connecticut
the
cash
can
see
digging
out
basically
said
acting
psycho,
but
I've
been
working,
so
it
has
stirred
me
to
take
it
up
to
pretty
much
after
your
work
myself.
A
E
A
B
Is
in
a
quarterback
teapot
in
a
hardened
men,
very
good
yeah,
you
can
go
to
my
hammock
as
I
me
get
underneath.
The
button
is
in
a
very
bad
people,
but
you
need
you
need
to
set
a
private
other
parameters:
millimeter
basic
for
remote
or
mini
right,
Emil,
right,
risa,
satou,
promote
you
need
to
set
these
two
parameters
and
ejector
the
official
document
order
for
their
meaning
of
Institute
parameters.
D
Apparently
done
simulator
$99
do
the
different
part
of
and
priority
for
football
and
posterior,
but
and
then
with
the
fire
destroyed
like
the
premises
then
dies
to
seven
different
kind
of
important.
For
the
ugly
side,
I
mean
the
humans
on
board.
I'll,
give
you
life.
Sorry,
okay,
now
remember
the
call
it
depend.
The
poison
can
be
said.
The
universe
for
the
okapi
ugly
device.
A
Focuser
you're
you're
saying
that
you
have
like
rgw
and
orbiting
in
the
same
yeah
cluster
again.
So
if
you
have
the
same
rule
they
they
have
to
have
the
same
cache
very
configurations,
but
typically
people
don't
put
RVD
and
RW
in
the
same
hole.
So
you
probably
have
to
base
pools
and
to
cashing
pools
once
sent
from
each
of
our
grp
d.
&Amp;.
D
D
D
A
A
B
A
Very,
very
briefly,
the
rails
doesn't
actually
know
that
there
are
block
devices,
so
the
challenge
would
be.
We
need
to
create
sort
of
directives
that
the
greatest
life
could
send
that
mark
the
greatest
authors
with
different
policies.
That
would
be
an
interesting
direction
problem.
The
other
thing
is
that
we
would
need
to
leave
a
redirect
object
in
the
capital.
A
A
So
some
color
is
so
before
fireflies
that,
of
course,
only
hyper
application,
but
3x
overhead
to
survive.
20
sec
failure
is
kind
of
unfortunate,
so,
with
razor
coating
you
can
create
for
data
chunks
of
you
carry
chunks
and
get
close.
These
of
failure,
tolerance
for
only
a
fargin,
fifty
percent,
so
sense
approach
to
erasure
coding
requires
the
user
to
create
a
racial
good
at
pool
with
a
specified
erasure
of
this
case
for
data
johnson
to
parry
cuts
that
pool
contains
razor
blade.
A
These
places,
a
swift
recovery
for
azmuth
replication
is
a
sight
to
an
ordered
set
of
OST
is
unclip,
my
crush
the
first
sport.
What
to
reimport
get
data
chunks
and
the
last
to
get
the
parity
prussia
doesn't
know
or
care
that
it's
a
racial
coded
rule.
It
just
knows
well
put
six
client
requests
both
weeds
at
rights
as
with
replicated
let's
go
to
the
primary
driver
is
responsible
for
doing
the
decode
on
breeds
and
for
parsley.
A
A
Error
to
read
not
from
a
racial,
hooded
tool,
life
computes,
the
location
of
the
object
using
brush
can
sense
a
read
request.
Primary
primary
then
determines
which
chunks
it
needs
to
read
to
fulfill
the
request
in
this
haze
Dorothy
failures,
we
can
simply
read
the
four
data
chunks
and
then
stake
them
together.
A
A
A
The
primary
will
peer
and
find
the
three
shots
have
logs
indicating
that
they
are
one
version,
B
and
preach
art
set
logs
in
beginning
of
their
own
version,
ed
in
fact,
either
version
of
the
object
is
perfectly
valid
because
the
claim
did
perform
the
right,
but
it
didn't
get
the
gallivan
better.
So
either
way
we
end
up
would
be
valid
from
consistency,
point
of
view
where
the
replicated
pool
we
would
simply
choose
one
or
the
other
in
factory,
which
is
the
newer
version,
and
we
would
recover
the
other
objects
to
version
B.
A
But
when
the
replicated
cool
we
don't
count
for
copies
of
either
A
or
B,
so
we
can't
cover
either
welcome.
So
our
power
failure
has
actually
caused
this.
The
whole
object,
that's
not
good.
So
there
are
some
voices.
We
can't
simply
write
the
data.
That's
what
the
replicated,
because
it
won't
work
with
reason.
I
just
mentioned,
we
even
tried
complicatedly
quite
innovative,
give
place
using
some
kind
of
a
two-phase,
condemns
or
write
a
headline,
but
that
would
cost
us
a
run
for
it
in
a
second
commit,
and
it.
D
A
We
simply
delete
the
object
football
in
a
constant
level
or
a
pen
which
rotate
back
to
the
old
object
size
for
a
remove.
We
never
actually
been
to
the
outfit
we
were
doing
the
operation,
they
simply
move
it
out
of
the
way
and
we
write
down
what
you've
earned.
What
the
name
is
no
controversy,
and
then
we
clean
it
up
when
several
is
committed.
The
operation,
but.
A
The
google
version
of
the
XS,
so
we
ask
this
information
in
line
with
the
logon
so
now
for
creation,
in
addition
to
simply
a
name
of
the
object,
every
log
entry
also,
who
is
a
list
of
things
you
need
to
do
to
undo
it,
but
they're
still
look
data
and
walking
three.
So
it's
still
small
except
directors
for
value
data.
We
simply
don't
let
you
do
it
on
a
racial
hooded
pools
because
it's
not
work.
We
actually
could
figure
out
a
way.
C
A
A
I
voted
for
whatever
RP,
but
and
that
might
work
once
we
get
the
cash
during
performance
up
to
a
point
where
it's
worth
one,
while
other
applications
can
assume
racial
coding,
erasure,
put
tools
directly,
radio
CW
if
anyone's
familiar
with
the
way,
it
works
mostly
lights
out
right
once
we
it
tends
to
the
new
data
objects
and
then
only
ever
reads
from
never
over
rights.
Those
those
objects.
So
those
objects
can
live
directly
over
images.
So.
C
A
To
do
of
racial
coatings
in
terms
of
the
actual
path
breaking
the
obligated
pieces,
I
didn't
specify,
which
one
is
because
we
don't
actually
care.
There
is
a
pluggable
interface
for
plugging
in
a
racial
coded
of
racial
reading.
Algorithms
we've
got
a
generator
plugin
I
sail
from
the
top
plugin
lrc
ml.