<s>
many	O
systems	O
such	O
as	O
Apache	B-Application
Hadoop	I-Application
and	O
Apache	B-Language
Spark	I-Language
.	O
</s>
<s>
MapR	B-Application
FS	I-Application
supports	O
access	O
to	O
tables	O
and	O
message	O
streams	O
using	O
the	O
Apache	B-Language
HBase	I-Language
and	O
Apache	B-Language
Kafka	I-Language
APIs	O
,	O
as	O
well	O
as	O
via	O
a	O
document	O
database	O
interface	O
.	O
</s>
<s>
data	O
platform	O
,	O
the	O
term	O
MapR	B-Application
FS	I-Application
is	O
used	O
more	O
specifically	O
to	O
refer	O
to	O
the	O
file-oriented	O
interfaces	O
,	O
</s>
<s>
Apache	B-Application
Hadoop	I-Application
by	O
providing	O
a	O
more	O
performant	O
and	O
stable	O
platform	O
.	O
</s>
<s>
influenced	O
by	O
various	O
other	O
systems	O
such	O
as	O
the	O
Andrew	B-Application
File	I-Application
System	I-Application
(	O
AFS	O
)	O
.	O
</s>
<s>
implementation	O
in	O
MapR	B-Application
FS	I-Application
is	O
completely	O
different	O
.	O
</s>
<s>
translating	O
HDFS	O
function	O
calls	O
into	O
an	O
internal	O
API	O
based	O
on	O
a	O
custom	O
remote	B-Operating_System
procedure	I-Operating_System
call	I-Operating_System
(	O
RPC	O
)	O
mechanism	O
.	O
</s>
<s>
MapR	B-Application
FS	I-Application
by	O
a	O
fully	O
mutable	O
file	O
system	O
even	O
when	O
using	O
the	O
HDFS	O
API	O
.	O
</s>
<s>
MapR	B-General_Concept
RPC	O
calls	O
.	O
</s>
<s>
and	O
an	O
approximate	O
emulation	O
of	O
the	O
Apache	B-Language
HBase	I-Language
API	O
.	O
</s>
<s>
Files	O
in	O
MapR	B-Application
FS	I-Application
are	O
internally	O
implemented	O
by	O
splitting	O
the	O
file	O
contents	O
into	O
chunks	O
,	O
</s>
<s>
These	O
B-trees	B-Architecture
are	O
also	O
used	O
to	O
implement	O
directories	O
.	O
</s>
<s>
Efficient	O
use	O
of	O
B-trees	B-Architecture
to	O
achieve	O
high	O
performance	O
even	O
with	O
very	O
large	O
directories	O
.	O
</s>
