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From YouTube: CDS Jewel -- Scrub Repair
A
Okay,
so
this
is
also
a
duplicate
of
one
from
last
CD
else.
We'll
probably
actually
make
progress
this
this
time.
The
main
problem
is
that
scrub
is
and
repair
or
not,
really
any
good
place
right
now.
Repair
particularly,
is
awkward
if
you
issue
a
repair
command
on
a
PG,
it
pretty
much
just
guesses
for
all
the
inconsistent
objects.
A
In
those
cases
the
OSD
will
guess
correctly,
but
in
the
more
general
case
with
rbd,
where
we
don't
have
an
up-to-date
hash,
then
we
need
to
expose
that
information
up
to
a
user
and
get
instructions,
and
there
are
a
couple
of
pieces
to
this
one.
The
way
scrub
is
structured
makes
it
difficult
to
repair
a
single
object
that
needs
to
change.
A
We
need
to
restructure
the
way
repair
works
so
that
scrub,
when
it's
in
repair
mode
issues,
a
repair
operation
on
a
single
object,
and
then
we
can
reuse
that
operation
from
a
different
part
of
the
code.
Where
ever
we
implement
the
following
interfaces.
We
need
to
be
able
to
let
the
client
query
inconsistent
pgs
in
a
way
that
makes
sense,
probably
somewhere
at
librettos
I,
get
inconsistent
pg's
method
like
I
mentioned
there.
A
Similarly,
we
need
to
be
able
to
get
information
about
inconsistent
objects
in
a
PG.
This
needs
to
be
payable
and
it
can't
be
in
a
camp
cause
a
scrub
when
you
cause
it.
So
this
means
that
scrub
will
need
to
write
down
its
results
into
some
form
of
temporary
object
that
we
can
query
it.
It's
not
necessary
for
this
object
to
be
persistent
across
the
placement
group,
although
we
could
choose
to
do
that,
I'm
uncertain
either
way
on
that
one
it.
A
Basically,
we
can
either
make
it
a
fully
replicated
a
hidden
metadata
object
or
we
could
make
it
just
a
temporary
object
on
the
primary
OST
that
we
have
to
rebuild
after
we
go
through
period,
not
sure
we
also
need
to
allow
it
directed
repair
of
an
object
via
something
like
prepared.
An
existing
object.
A
A
There
are
some
details
with
what
to
do
with
the
case,
where
we're
issuing
a
repair
on
based
on
consistent
info
t.
We
got
from
a
primary
firm
previous
interval,
but
I
think
we
just
returned
again
enforce
the
client
to
require
a
and
consistent
pg's.
In
that
case,
all
in
all,
it's
not
enormously
complicated.
It's
just
a
lot
of
work
and,
more
importantly,
2000
asking
to
be
built
to
test
all
of
this,
or
else
the
code
will
rot.
A
C
A
To
a
point,
we
could
probably
give
it
a
repair
with
an
intelligent
threshold.
Maybe
at
the
you
know
one
level
we
let
the
OSD
assume
that
anything
that
doesn't
match
the
object
info
size
is
probably
wrong
and
maybe
that's
enough
to
repair
it.
So
we
might
have
some
hierarchy
of
guesses.
We're
willing
to
let
error,
maybe
maybe
at
the
very
dumbest
level,
if
it's
missing
its
attributes.
Clearly
that's
corrupt,
but
but
the
general.
A
A
A
A
A
A
Not
enormously
it's
a
concern,
but
usually
if
the
disc
was
that
failed,
then
be
toasty
would
simply
have
committed
suicide.
That
would
be
fine.
So
if
this
hastens
us
down
that
path,
then
I'm.
Okay,
with
that
that
is,
if
the
process
of
writing
out
the
temporary
object,
causes
an
e
io
than
awesome
done
and
done.