<s>
XtreemFS	B-Application
is	O
an	O
object-based	B-Application
,	O
distributed	B-Protocol
file	I-Protocol
system	I-Protocol
for	O
wide	O
area	O
networks	O
.	O
</s>
<s>
XtreemFS	B-Application
 '	O
outstanding	O
feature	O
is	O
full	O
(	O
all	O
components	O
)	O
and	O
real	O
(	O
all	O
failure	O
scenarios	O
,	O
including	O
network	B-Operating_System
partitions	I-Operating_System
)	O
fault	B-General_Concept
tolerance	I-General_Concept
,	O
while	O
maintaining	O
POSIX	O
file	O
system	O
semantics	O
.	O
</s>
<s>
Fault-tolerance	B-General_Concept
is	O
achieved	O
by	O
using	O
Paxos-based	O
lease	B-Operating_System
negotiation	O
algorithms	O
and	O
is	O
used	O
to	O
replicate	O
files	O
and	O
metadata	O
.	O
</s>
<s>
SSL	B-Protocol
and	O
X.509	O
certificates	O
support	O
make	O
XtreemFS	B-Application
usable	O
over	O
public	O
networks	O
.	O
</s>
<s>
XtreemFS	B-Application
has	O
been	O
under	O
development	O
since	O
early	O
2007	O
.	O
</s>
<s>
XtreemFS	B-Application
1.0	O
was	O
released	O
in	O
August	O
2009	O
.	O
</s>
<s>
The	O
1.0	O
release	O
includes	O
support	O
for	O
read-only	O
replication	O
with	O
failover	O
,	O
data	O
center	O
replica	O
maps	O
,	O
parallel	O
reads	O
and	O
writes	O
,	O
and	O
a	O
native	O
Windows	B-Application
client	O
.	O
</s>
<s>
An	O
improved	O
Hadoop	B-Application
integration	O
and	O
support	O
for	O
SSDs	O
was	O
added	O
in	O
version	O
1.5	O
.	O
</s>
<s>
XtreemFS	B-Application
is	O
funded	O
by	O
the	O
European	O
Commission	O
's	O
IST	O
programme	O
.	O
</s>
<s>
The	O
original	O
XtreemFS	B-Application
team	O
founded	O
Inc	O
.	O
in	O
2013	O
.	O
</s>
<s>
Servers	O
for	O
Linux	B-Application
and	O
Solaris	O
Natively	O
and	O
Non-Native	O
Windows	B-Application
Java	B-Language
&	O
ANT	O
based	O
server	O
.	O
</s>
<s>
in	O
Hadoop	B-Application
clusters	O
,	O
</s>
