<s>
HBase	B-Language
is	O
an	O
open-source	B-Application
non-relational	B-General_Concept
distributed	B-Operating_System
database	I-Operating_System
modeled	O
after	O
Google	B-Application
's	I-Application
Bigtable	B-Application
and	O
written	O
in	O
Java	B-Language
.	O
</s>
<s>
It	O
is	O
developed	O
as	O
part	O
of	O
Apache	O
Software	O
Foundation	O
's	O
Apache	B-Application
Hadoop	I-Application
project	O
and	O
runs	O
on	O
top	O
of	O
HDFS	O
(	O
Hadoop	B-Application
Distributed	O
File	O
System	O
)	O
or	O
Alluxio	B-Application
,	O
providing	O
Bigtable-like	O
capabilities	O
for	O
Hadoop	B-Application
.	O
</s>
<s>
That	O
is	O
,	O
it	O
provides	O
a	O
fault-tolerant	B-General_Concept
way	O
of	O
storing	O
large	O
quantities	O
of	O
sparse	B-General_Concept
data	O
(	O
small	O
amounts	O
of	O
information	O
caught	O
within	O
a	O
large	O
collection	O
of	O
empty	O
or	O
unimportant	O
data	O
,	O
such	O
as	O
finding	O
the	O
50	O
largest	O
items	O
in	O
a	O
group	O
of	O
2	O
billion	O
records	O
,	O
or	O
finding	O
the	O
non-zero	O
items	O
representing	O
less	O
than	O
0.1	O
%	O
of	O
a	O
huge	O
collection	O
)	O
.	O
</s>
<s>
HBase	B-Language
features	O
compression	O
,	O
in-memory	O
operation	O
,	O
and	O
Bloom	B-Algorithm
filters	I-Algorithm
on	O
a	O
per-column	O
basis	O
as	O
outlined	O
in	O
the	O
original	O
Bigtable	B-Application
paper	O
.	O
</s>
<s>
Tables	O
in	O
HBase	B-Language
can	O
serve	O
as	O
the	O
input	O
and	O
output	O
for	O
MapReduce	B-Operating_System
jobs	O
run	O
in	O
Hadoop	B-Application
,	O
and	O
may	O
be	O
accessed	O
through	O
the	O
Java	B-Language
API	O
but	O
also	O
through	O
REST	O
,	O
Avro	B-Operating_System
or	O
Thrift	B-Protocol
gateway	O
APIs	O
.	O
</s>
<s>
HBase	B-Language
is	O
a	O
wide-column	B-Application
store	I-Application
and	O
has	O
been	O
widely	O
adopted	O
because	O
of	O
its	O
lineage	O
with	O
Hadoop	B-Application
and	O
HDFS	O
.	O
</s>
<s>
HBase	B-Language
runs	O
on	O
top	O
of	O
HDFS	O
and	O
is	O
well-suited	O
for	O
fast	O
read	O
and	O
write	O
operations	O
on	O
large	O
datasets	O
with	O
high	O
throughput	O
and	O
low	O
input/output	O
latency	O
.	O
</s>
<s>
HBase	B-Language
is	O
not	O
a	O
direct	O
replacement	O
for	O
a	O
classic	O
SQL	B-Language
database	I-Language
,	O
however	O
Apache	B-Application
Phoenix	I-Application
project	O
provides	O
a	O
SQL	B-Language
layer	O
for	O
HBase	B-Language
as	O
well	O
as	O
JDBC	B-Language
driver	O
that	O
can	O
be	O
integrated	O
with	O
various	O
analytics	O
and	O
business	B-General_Concept
intelligence	I-General_Concept
applications	O
.	O
</s>
<s>
The	O
Apache	B-Language
Trafodion	I-Language
project	O
provides	O
a	O
SQL	B-Language
query	O
engine	O
with	O
ODBC	B-Application
and	O
JDBC	B-Language
drivers	O
and	O
distributed	O
ACID	O
transaction	O
protection	O
across	O
multiple	O
statements	O
,	O
tables	O
and	O
rows	O
that	O
use	O
HBase	B-Language
as	O
a	O
storage	O
engine	O
.	O
</s>
<s>
HBase	B-Language
is	O
now	O
serving	O
several	O
data-driven	O
websites	O
but	O
Facebook	B-Application
's	O
Messaging	O
Platform	O
migrated	O
from	O
HBase	B-Language
to	O
MyRocks	B-Language
in	O
2018	O
.	O
</s>
<s>
Unlike	O
relational	O
and	O
traditional	O
databases	O
,	O
HBase	B-Language
does	O
not	O
support	O
SQL	B-Language
scripting	O
;	O
instead	O
the	O
equivalent	O
is	O
written	O
in	O
Java	B-Language
,	O
employing	O
similarity	O
with	O
a	O
MapReduce	B-Operating_System
application	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
HBase	B-Language
is	O
a	O
CP	O
type	O
system	O
.	O
</s>
<s>
Apache	B-Language
HBase	I-Language
began	O
as	O
a	O
project	O
by	O
the	O
company	O
Powerset	B-General_Concept
out	O
of	O
a	O
need	O
to	O
process	O
massive	O
amounts	O
of	O
data	O
for	O
the	O
purposes	O
of	O
natural-language	B-General_Concept
search	I-General_Concept
.	O
</s>
<s>
Facebook	B-Application
elected	O
to	O
implement	O
its	O
new	O
messaging	O
platform	O
using	O
HBase	B-Language
in	O
November	O
2010	O
,	O
but	O
migrated	O
away	O
from	O
HBase	B-Language
in	O
2018	O
.	O
</s>
<s>
The	O
following	O
is	O
a	O
list	O
of	O
notable	O
enterprises	O
that	O
have	O
used	O
or	O
are	O
using	O
HBase	B-Language
:	O
</s>
<s>
Flipkart	O
uses	O
HBase	B-Language
for	O
its	O
search	O
index	O
and	O
user	O
insights	O
.	O
</s>
<s>
Spotify	B-Application
uses	O
HBase	B-Language
as	O
base	O
for	O
Hadoop	B-Application
and	O
machine	O
learning	O
jobs	O
.	O
</s>
<s>
Tuenti	O
uses	O
HBase	B-Language
for	O
its	O
messaging	O
platform	O
.	O
</s>
<s>
Yahoo	B-Application
!	I-Application
</s>
