<s>
ScyllaDB	B-Language
is	O
an	O
open-source	B-Application
distributed	B-Operating_System
NoSQL	B-General_Concept
wide-column	O
data	B-General_Concept
store	I-General_Concept
.	O
</s>
<s>
It	O
was	O
designed	O
to	O
be	O
compatible	O
with	O
Apache	B-Application
Cassandra	I-Application
while	O
achieving	O
significantly	O
higher	O
throughputs	O
and	O
lower	O
latencies	O
.	O
</s>
<s>
It	O
supports	O
the	O
same	O
protocols	O
as	O
Cassandra	B-Application
(	O
CQL	O
and	O
Thrift	B-Protocol
)	O
and	O
the	O
same	O
file	O
formats	O
(	O
SSTable	O
)	O
,	O
but	O
is	O
a	O
completely	O
rewritten	O
implementation	O
,	O
using	O
the	O
C++20	B-Language
language	O
replacing	O
Cassandra	B-Application
's	O
Java	O
,	O
and	O
the	O
Seastar	O
asynchronous	O
programming	O
library	O
replacing	O
classic	O
Linux	B-Application
programming	O
techniques	O
such	O
as	O
threads	O
,	O
shared	O
memory	O
and	O
mapped	O
files	O
.	O
</s>
<s>
In	O
addition	O
to	O
implementing	O
Cassandra	B-Application
's	O
protocols	O
,	O
ScyllaDB	B-Language
also	O
implements	O
the	O
Amazon	B-Application
DynamoDB	I-Application
API	O
.	O
</s>
<s>
ScyllaDB	B-Language
uses	O
a	O
sharded	B-General_Concept
design	O
on	O
each	O
node	O
,	O
meaning	O
that	O
each	O
CPU	B-Device
core	O
handles	O
a	O
different	O
subset	O
of	O
data	O
.	O
</s>
<s>
The	O
ScyllaDB	B-Language
authors	O
claim	O
that	O
this	O
design	O
allows	O
ScyllaDB	B-Language
to	O
achieve	O
much	O
better	O
performance	O
on	O
modern	O
NUMA	B-Operating_System
SMP	B-Operating_System
machines	O
,	O
and	O
to	O
scale	O
very	O
well	O
with	O
the	O
number	O
of	O
cores	O
.	O
</s>
<s>
They	O
have	O
measured	O
as	O
much	O
as	O
2	O
million	O
requests	O
per	O
second	O
on	O
a	O
single	O
machine	O
,	O
and	O
also	O
claim	O
that	O
a	O
ScyllaDB	B-Language
cluster	O
can	O
serve	O
as	O
many	O
requests	O
as	O
a	O
Cassandra	B-Application
cluster	O
10	O
times	O
its	O
size	O
–	O
and	O
do	O
so	O
with	O
lower	O
latencies	O
.	O
</s>
<s>
A	O
2017	O
benchmark	O
from	O
Samsung	B-Application
observed	O
the	O
10x	O
speedup	O
on	O
high-end	O
machines	O
–	O
the	O
Samsung	B-Application
benchmark	O
reported	O
that	O
ScyllaDB	B-Language
outperformed	O
Cassandra	B-Application
on	O
a	O
cluster	O
of	O
24-core	O
machines	O
by	O
a	O
margin	O
of	O
10	O
–	O
37x	O
depending	O
on	O
the	O
YCSB	B-Application
workload	O
.	O
</s>
<s>
ScyllaDB	B-Language
is	O
available	O
on-premises	O
,	O
on	O
major	O
public	O
cloud	O
providers	O
,	O
or	O
as	O
a	O
DBaaS	O
(	O
ScyllaDB	B-Language
Cloud	O
)	O
.	O
</s>
<s>
ScyllaDB	B-Language
was	O
started	O
in	O
December	O
2014	O
by	O
the	O
startup	O
Cloudius	O
Systems	O
(	O
later	O
renamed	O
ScyllaDB	B-Language
Inc	O
.	O
)	O
,	O
previously	O
known	O
for	O
having	O
created	O
OSv	B-Language
.	O
</s>
<s>
ScyllaDB	B-Language
was	O
released	O
as	O
open	O
source	O
in	O
September	O
2015	O
,	O
under	O
the	O
AGPL	B-Application
license	O
.	O
</s>
<s>
Employees	O
of	O
ScyllaDB	B-Language
Inc	O
.	O
remain	O
the	O
primary	O
coders	O
behind	O
Scylla	B-Language
,	O
but	O
its	O
development	O
is	O
open	O
to	O
the	O
public	O
and	O
uses	O
public	O
GitHub	B-Application
repositories	O
and	O
public	O
mailing	O
lists	O
.	O
</s>
