<s>
RethinkDB	B-Operating_System
is	O
a	O
free	B-License
and	I-License
open-source	I-License
,	O
distributed	O
document-oriented	B-General_Concept
database	I-General_Concept
originally	O
created	O
by	O
the	O
company	O
of	O
the	O
same	O
name	O
.	O
</s>
<s>
The	O
database	O
stores	O
JSON	B-General_Concept
documents	O
with	O
dynamic	O
schemas	B-Application
,	O
and	O
is	O
designed	O
to	O
facilitate	O
pushing	O
real-time	O
updates	O
for	O
query	B-Language
results	O
to	O
applications	O
.	O
</s>
<s>
The	O
CNCF	O
(	O
Cloud	B-Application
Native	I-Application
Computing	I-Application
Foundation	I-Application
)	O
then	O
purchased	O
the	O
rights	O
to	O
the	O
RethinkDB	B-Operating_System
source	O
code	O
and	O
contributed	O
it	O
to	O
the	B-Operating_System
Linux	I-Operating_System
Foundation	I-Operating_System
.	O
</s>
<s>
RethinkDB	B-Operating_System
was	O
founded	O
in	O
2009	O
,	O
and	O
open-sourced	O
at	O
version	O
1.2	O
in	O
2012	O
.	O
</s>
<s>
In	O
2015	O
,	O
RethinkDB	B-Operating_System
released	O
version	O
2.0	O
,	O
announcing	O
that	O
it	O
was	O
production-ready	O
.	O
</s>
<s>
On	O
October	O
5	O
,	O
2016	O
,	O
the	O
company	O
announced	O
it	O
was	O
shutting	O
down	O
,	O
transitioning	O
members	O
of	O
its	O
engineering	O
team	O
to	O
Stripe	B-Application
,	O
and	O
would	O
no	O
longer	O
offer	O
production	O
support	O
.	O
</s>
<s>
On	O
February	O
6	O
,	O
2017	O
,	O
The	O
Cloud	B-Application
Native	I-Application
Computing	I-Application
Foundation	I-Application
purchased	O
the	O
rights	O
to	O
the	O
source	O
code	O
and	O
relicensed	O
it	O
under	O
the	O
Apache	B-Application
License	I-Application
2.0	I-Application
.	O
</s>
<s>
RethinkDB	B-Operating_System
uses	O
the	O
ReQL	O
query	B-Language
language	O
,	O
an	O
internal	O
(	O
embedded	O
)	O
domain-specific	B-Language
language	I-Language
officially	O
available	O
for	O
Ruby	B-Language
,	O
Python	B-Language
,	O
Java	B-Language
and	O
JavaScript	B-Language
(	O
including	O
Node.js	B-Language
)	O
.	O
</s>
<s>
It	O
has	O
support	O
for	O
table	B-Language
joins	I-Language
,	O
groupings	O
,	O
aggregations	O
and	O
functions	O
.	O
</s>
<s>
There	O
are	O
also	O
unofficial	O
,	O
community-supported	O
drivers	O
for	O
other	O
languages	O
,	O
including	O
C#	B-Application
,	O
Clojure	B-Language
,	O
Erlang	B-Operating_System
,	O
Go	B-Application
,	O
Haskell	B-Language
,	O
Lua	B-Language
,	O
and	O
PHP	B-Application
.	O
</s>
<s>
According	O
to	O
the	O
DB-Engines	B-Application
ranking	I-Application
,	O
as	O
of	O
February	O
2016	O
,	O
it	O
was	O
the	O
46th	O
most	O
popular	O
database	O
.	O
</s>
<s>
A	O
distinguishing	O
feature	O
of	O
RethinkDB	B-Operating_System
is	O
the	O
first	O
class	O
support	O
for	O
real-time	O
change	O
feeds	O
.	O
</s>
<s>
A	O
change	O
query	B-Language
returns	O
a	O
cursor	O
which	O
allows	O
blocking	O
or	O
non-blocking	O
requests	O
to	O
keep	O
track	O
of	O
a	O
potentially	O
infinite	O
stream	O
of	O
real-time	O
changes	O
.	O
</s>
<s>
Due	O
to	O
seeming	O
stagnation	O
,	O
RethinkDB	B-Operating_System
was	O
forked	O
by	O
members	O
of	O
the	O
community	O
on	O
May	O
17	O
,	O
2018	O
.	O
</s>
<s>
The	O
new	O
project	O
,	O
called	O
RebirthDB	O
,	O
is	O
also	O
hosted	O
on	O
GitHub	B-Application
.	O
</s>
