English
资源说明：The
viewfs
file
system
provides
a
way
to
manage
multiple
Hadoop
file
system
namespace
(or
namespace
volumes).
It
is
particularly
useful
clusters
having
multiple
namenodes
(post
federation)
and
hence
multiple
namespaces.
Viewfs
is
analogous
to
the
client
side
mount
tables
in
some
Unix/Linux
systems.
Viewfs
can
be
used
to
create
personalized
namespace
views
and
also
per‐cluster
common
views.
This
document
describes
how
to
use
viewfs
in
the
federated
HDFS
to
provide
a
per‐cluster
global
namespace
so
that
applications
can
operate
in
a
way
similar
to
the
pre‐federation
world.
This
guide
is
described
in
the
context
of
a
large
Hadoop
customer
that
has
several
clusters,
each
if
which
are
going
to
be
federated
using
the
new
Federated
HDFS.
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