<s>
Voldemort	B-Application
is	O
a	O
distributed	O
data	O
store	O
that	O
was	O
designed	O
as	O
a	O
key-value	B-Data_Structure
store	I-Data_Structure
used	O
by	O
LinkedIn	B-Application
for	O
highly-scalable	O
storage	O
.	O
</s>
<s>
It	O
is	O
named	O
after	O
the	O
fictional	O
Harry	O
Potter	O
villain	O
Lord	O
Voldemort	B-Application
.	O
</s>
<s>
Voldemort	B-Application
does	O
not	O
try	O
to	O
satisfy	O
arbitrary	O
relations	O
and	O
the	O
ACID	O
properties	O
,	O
but	O
rather	O
is	O
a	O
big	O
,	O
distributed	O
,	O
persistent	O
hash	O
table	O
.	O
</s>
<s>
A	O
2012	O
study	O
comparing	O
systems	O
for	O
storing	O
application	B-Application
performance	I-Application
management	I-Application
data	O
reported	O
that	O
Voldemort	B-Application
,	O
Apache	B-Application
Cassandra	I-Application
,	O
and	O
HBase	B-Language
all	O
offered	O
linear	O
scalability	O
in	O
most	O
cases	O
,	O
with	O
Voldemort	B-Application
having	O
the	O
lowest	O
latency	O
and	O
Cassandra	B-Application
having	O
the	O
highest	O
throughput	O
.	O
</s>
<s>
In	O
the	O
parlance	O
of	O
Eric	O
Brewer	O
's	O
CAP	B-Operating_System
theorem	I-Operating_System
,	O
Voldemort	B-Application
is	O
an	O
AP	O
type	O
system	O
.	O
</s>
<s>
Voldemort	B-Application
's	O
creator	O
and	O
primary	O
corporate	O
contributor	O
,	O
LinkedIn	B-Application
,	O
has	O
migrated	O
all	O
of	O
their	O
systems	O
off	O
of	O
Voldemort	B-Application
as	O
of	O
approximately	O
August	O
2018	O
,	O
with	O
no	O
replacement	O
sponsor	O
.	O
</s>
<s>
Voldemort	B-Application
uses	O
in-memory	O
caching	O
to	O
eliminate	O
a	O
separate	O
caching	O
tier	O
.	O
</s>
<s>
Voldemort	B-Application
reads	O
and	O
writes	O
scale	O
horizontally	O
.	O
</s>
<s>
The	O
Voldemort	B-Application
distributed	O
data	O
store	O
supports	O
pluggable	O
placement	O
strategies	O
for	O
distribution	O
across	O
data	O
centers	O
.	O
</s>
<s>
Each	O
data	O
node	O
is	O
independent	O
to	O
avoid	O
central	B-Architecture
point	I-Architecture
of	I-Architecture
failure	I-Architecture
.	O
</s>
<s>
Pluggable	O
serialization	O
allows	O
rich	O
keys	O
and	O
values	O
including	O
lists	O
and	O
tuples	O
with	O
named	O
fields	O
,	O
as	O
well	O
as	O
the	O
integration	O
with	O
common	O
serialisation	O
frameworks	O
such	O
as	O
Avro	B-Operating_System
,	O
Java	B-Language
Serialization	O
,	O
Protocol	B-Protocol
Buffers	I-Protocol
,	O
and	O
Thrift	B-Protocol
.	O
</s>
